Memoirs MCZ 5402

/IDemoirs of tbe flDuseum of Comparative ZoolOQp AT HARVARD COLLEGE Vol LIV No SOME ADDITIONAL FOSSIL ECHINI FROM JAMAICA BY BENJAMIN WALWORTH ARNOLD and HUBERT LYAL\N CLARK WITH FIVE PLATES CAMBRIDGE, IPrtnteD for tbe U S A /Duseum December, 1934 SOME ADDITIONAL FOSSIL ECHINI FROM JAMAICA After M C the publication of our Z., 50, no 1) amount large Memoir on Jamaican the senior author spent of additional material Much Mem Fossil Echini (1927, some time in Jamaica and secured a of this very naturally duplicates the species already recorded but there are 13 specimens which represent apparently new and a few others which species seemed advisable to prepare new forms and such call for special comment this report giving descriptions has therefore It and figures of the additional information as will help to a l)etter understanding of the fossil echini of Jamaica.' The new species here described represent nine genera of which one is new to and four others were not previously listed from Jamaica It is a regrettable that three of the new species must be referred to the heterogeneous group science fact called Macropneustes It and pedicellariae to is exceedingly difficult in the absence of spines, fascioles draw generic lines among spatangoids satisfactorily It is however regrettable it maybe, that certain genera become therefore unavoidable, large and unwieldly assemblages of forms which are not perhaps really closely related In the following pages the same systematic sequence is used as in our Memoir Notes on previously described genera and species are thus intercalated in natural position among the new We forms prefer, however, to mention here a specimen of Ananchytes, which was found among stones and other posed to be of local origin, in a (i.e appearance it Hill of to Jamaica, probably in The death curios, sup- It is an internal mould mm long, 30 mm was obviously dug out of chalk and has the dark gray similar specimens from England So far as we can see this seems almost certain that England ' Richmond It the English Ananchytes ovatus and at the cast of the interior of the test) and measures 37 and 22 mm high is box of the senior author, The genus is not their known from the West wide flinty fossil Indies, specimen must have been brought from a box of curios this November 8, 1932, prevented the completion of the paper as But this is now made possible through the generous cooperation of Mrs Arnold Mr Arnold was an unusual field worker and collector and his enthusiasm was contagious He secured the assistance of natives in Jamaica to a remarkable extent and originally planned and has seriously delayed its publication to get together an extraordinary collection of Jamaican fossil echini Neaily all of this, inthe holotypes and most of the paratypes of our new forms, is now in the Museum of Comparative Zoology, the generous gift of the Arnold estate In the death of Mr Ainold this museum loses a was thus able cluding all generous friend, and science the services of an unpretending and enthusiastic collector — H L C JAJVIAICAN FOSSIL ECHINI 140 ECHINID.4E SCOLIECHINUS AXIOLOGUS Mem M Arnold and Clark, 1927 C Z., 50, p 23 A badly weathered specimen of this species, previously known only from the holotype, measures 27 mm in diameter The characteristic arrangement of the pore-pairs evident, but the tubercles are is stome with conspicuous from what part of all badly worn down The large peri- gill-cuts is a noticeable feature There specimen came ^'\L& ^a.be\ Jamaica this is nothing to show SQ-^.: \AoUwrs ECHINOMETRID.\E ECHINOMETRA LUCUNTER Echinus lucunter Lione, 1758 Syst Nat., ed 10, p 665 Echinomelra lucunter Loven, 1887 Bih Svensk Vet.-Akad Handl., 13 A (4), no 5, p 157 perfectly fossihzed Echinometra, with the oral surface still imbedded in a fragment of open, porous hmestone, seems to be unquestionably identical with common on the recent species so long, 34 each arc, mm the coast of Jamaica today It measures 38 wide and about 20 in St high There are as a rule pore-pairs in and only one with Ehzabeth Parish a few have but men was found mm mm 5, is visible This interesting speci- CLYPEASTRIDAE Clypeaster antillarum Cotteau, 1875 We Kongl Sven Vet Akad Hand]., 13, no with considerable hesitation, to this species, a Cl>T)easter with a refer, flat oral surface, figure given figs and 2) 6, p 15 a well-arched dorsal side by Jackson , but and large petals, which resembles the (1922, Carnegie Inst Washington, publ no 306, pi 5, differs in having the test narrower, especially posteriorly The upper surface is badly weathered so that the details of the petals are obscured The specimen is 100 gray in color The mm long, 78 exact locality mm is wide and 26 not known mm high, and is light slate \ , ^0*/^' CLYPEASTRIDAE Clypeaster eurychorus Plate mm Test 132 mm long, 114 ments are approximate The highly arched test 1, figs 141 ' sp nov and mm wide and 51 high at apex; these measure- owing to the defective condition of the specimen slopes more rapidly and uniformly anteriorly than posonly, teriorly; apex a httle posterior to center; text thicker through interambula- crum than mm and ambulacrum in is nearly Hat for 20 then slopes quite abruptly to margin; apical system about 10 diameter markedly elevated, center about its mm mm in above the proximal part Petaloid area very large covering about two-thirds of the dorsal of the petals and V, obovate, 56 mm long by 35 mm wide, almost closed diswith poriferous areas nearly 10 mm wide where widest and inter poriferous surface; petals tally, posterior to the apex the test ; area nearly 16 I mm across; petals II 43 x 32 mm., open or mia at tip, and interporiferous, 15 mm.; petal others, about 56 x 32 nam was nearly ; and IV shorter and more broadly obovate, with poriferous areas about 8.5 III, relatively longer the extreme tip is mm In all and narrower than the wanting but apparently the petal or quite closed; poriferous areas or poriferous barely 15 mm across mm across with the inter- the petals the pore-pairs are crowded, 10-12 to a centimeter, the ridges between the pairs carry a single series of about 10 tubercles pores Whole tuberculation 5, fairly distinct, of aboral surface rather close about or Oral surface more or less mm from and fine Genital center of abactinal system concealed in matrix; so far as visible, it is quite flat with no indication of concavity or even of a depression about the mouth, which is Periproct not certainly deterininable wholly concealed about mm Holotype (M C definite locality is This species its Z 3,474) center is mm from apparently, posterior end it is of test and only specimen, from Jamaica but no more known is combined with the distinctive and in diameter ; any other of the West Indian forms, the height closed petals and the flat oral surface being sufficiently quite unlike large, Whether the elevation and position of the abactinal system and the abrupt slope of the posterior end of the test are constant features remains to be shown but if they are, the species is the same group with duchassaingi ' eOpix