236 ME. E. T. KEWTOK" ON MEsozoic FOSSILS [May 1 90 1, 



TJntcaebium CAEDioiDES (PhiUips). (PI. IX, fig. 18.) 



1829. Corhula cardioides, ' Geology of Yorkshire ' pi. xiv, fig. 12. 



Several examples of internal and external casts, all more or less 

 imperfect, belong to this species, which is noticed by Prof. Tate 

 from the zones of Ammonites jplanorhis, Amm. angulatus, and higher 

 beds, in Antrim. It is found throughout the Lower and Middle 

 Lias of England. 



Protocarditjm truncattjm ? (Sowerby). 



1827. Cardium truncatum, ' Min. Conch.' pi. dliii, fig. 3. 



An internal cast, which seems more likely to be the above species 

 than Protocardium Philippianum, is thus recordedso thatit may not 

 be overlooked, but its identity is uncertain. Pr. truncatum occurs 

 in the uppermost beds of the Lower Lias, but it is essentially a 

 Middle Liassic form. 



GoNioMYA sp. (cf. G. rhomhifera, Goldfuss, and G. sinemuriensis^ 

 Oppel). (PI. IX, fig. 17.) 



A portion of a small and imperfect Goniomya may belong to one 

 of the above species. It has the widely truncated angle in the 

 middle of the valve similar to G. rJiombifera, Goldf., of the Upper 

 Lias, and, judging from the lines of growth, was a similarly short 

 shell. G. sinemuriensis is said by Oppel ^ to be from the Lower 

 Lias and to be like G. rJiomhifera in form, but with the anterior 

 ribs irregular and meeting the cross-ribs at a more obtuse angle. 

 Our specimen is too imperfect to show these characters properly, 

 and on the whole it seems most like G, rhombifera from the Upper 

 Lias; but as there is no evidence of Upper Liassic species among 

 these Arran fossils, it is most likely that this Goniomya is the 

 same as that found near Belfast in Ammonites anr/^datus-heds and 

 referred by Prof. Tate ^ to G. sinemuriensis of Oppel. 



PfiOLADOMYA (?). (PI. IX, fig. 19.) 



Doubtfully represented by a single crushed internal cast. 



Tancredia (?) Peachi, sp. nov. (PL IX,. fig. 20.) 



Among these Arran Liassic fossils is one the generic position 

 of which is still obscure. At first sight, it somewhat resembles a 

 Pleuromya with well-marked concentric ridges ; but a closer exami- 

 nation shows the deeper, and probably posterior, end to be truncated,, 

 and exhibiting a distinct groove extending from the umbonal region 

 until it joins the lower margin at the posterior angle. About 

 seventeen or eighteen angular concentric ridges may be counted, all 

 of which end abruptly at the posterior groove. The shell has been 

 flattened by pressure, and the depression seen towards the anterioj^ 

 aad smaller end is to some extent, at least, due to this cause} 

 Both the cast and mould are preserved, but a careful examination 

 of them has revealed no indication of the shell having continued 



^ * Die Juraforniation, &c.' 1856-58, p. 95. 



2 Bep. Belfast Nat Field Club, App. 1,^^1870) p. 11. 



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