322 CRETACEOUS PELECYPODA 



12-13. — JV.porrectdjB^ss., SLud siliqua,^ Goldt, Sive both narrow^ posteriorly much produced^ 

 resembling" Adrana in type. Conrad''s Perrisonota is a similar shell. 



14.^2. — N. tellinella, Rss.^ semilunaris, Buch, producta, Nilss.^ (Favre, M. foss. de Lemberg^ 

 1869jp. llS-f), Mante Hi y Gein._, suhcequalls, 'Rq^.^PuscJiH, Alth, (vide Favre, M. foss. de Lemberg, 

 1869, p. 119)^ Fcersteri, MiilL, EhrlicM and discors, Giimbel. The last species closely resembles 

 semilunaris, Buch. 



23-26.— iV. angusta, Ryckh.^ acutissima, Miiller,/"/ caudata,X Koch and D., in Petref. Aach. 

 Kreidef.^ 1847, p. 16, and Supplement to the same, 1859, p. 28), alata and Eagenovi, Miiller, 

 (ibidem, Suppl.). All these are noted in Bosquet^s list of Limbourg fossils in Staring^s Bodem v. 

 Nederland, II deel, Nos. 349, 350 ( = 404), 351 and 352. 



27. — N. undulata, Sow., (Nuciila ead,, Sow., M. Conch., vi, p. 103, pi. 554, fig. 3, 2.TALeda ead., 

 d^Orb., Prod. II, 136, No. 224). Pictet and Camp iche place this species among the doubtful 

 forms, considering it to be a Necera, I have not examined any specimens, nor do Pictet and 

 Campiche state whether they have done so. Their suggestion seems to be based upon Sowerby^s 

 remark, that the species may be a Corhda, As the shell is equivalve, it evidently does not belong 

 to that genus, but it seems not improbable that it is a Nemra, though sufficient evidence appears 

 as yet wanting. 



28. — N, tenuirostris, Rss., (Leda ead., apud d^Orbigny). Pictet and Campiche quote this 

 species as probably identical with the supposed N. undulata, just mentioned. They evidently based 

 their judgment only upon a superficial glance at the figures, for in Reuss'' description the hinge-teeth 

 are clearly pointed out (Bohm. Kreidef., pt. II, p. 7). 



29. — N. falcata, Bss., (ibidem, p. 8,) must be for the present kept distinct from semilunaris, 

 with which Geinitz suggested it might be identical. Judging from figures, there are marked 

 differences in the shape of the two shells. 



30. — N, lyncuris (Leda lyncuris, Eichwald, Leth. geog., xme livr., 1867, p. 594) -, this rather 

 appears to be a Nucula than a Nuetdana. 



31-41. — Yoldia Bvansi, Meek and Hayd., scitula, M. and H., suhnasuta, Hall and M., ventri- 

 cosa,^ H. and M. ; Nuculana hisulcata, M. and H., longifrons. Con., pinn^eformis, Gabb, pro- 

 texta, G., SlacUana, G., sulangulata, G., and Neilo Hindi, M., are noticed by Meek from the creta- 

 ceous deposits of North America in Smiths. Misc. Coll., No. 177, 1864, pp. 7 and 8. 



42-54. — Nuculana cuUelliformis, Bog., Gahhii, Con., improcera. Con., oregona, Shum., penita, 

 Con., parva,\\ Bog., Willametensis , Shum., iV^^7(9 ? ahrupta. Con., Yoldia acutifrons. Con., impressa, 

 Con., nasuta, Gabb, and protexta. Con., are marked from the so-called lower eocene beds of 

 N. America by Conrad in Smiths. Misc. Coll., No. 200, 1866, pp. 3 and 4. 



55. — Nuculana translucida, Gabb, Pal. Calif., I, p. 200. 



N.perdita and crehrilineata of Conrad from PalsBstine are identified by Fraas with Nuculana 

 scapha and suhrecurva of d^Orbigny respectively (vide Wiirt. Naturw. Jahresh., vol. xxiii, 1867 

 p. 236). 



56-57. — Nucularia papyria and Perrisonota protexta are described by Conrad from New Jersey, 

 (Am. Jour. Conch., V, pp. 44 and 93). 



58-62. — Nuculana socialis, Nuculana sp. ind,, Yoldia striatula, Y. ohtusata, and Y. scaphuloidea 

 occur in the South Indian cretaceous deposits. 



* Non N. siliqua, Eeeve, (1856) == Yoldia glacialis, Gray. 



t Favre's figure represents a rather more elongated form than Nilsson's original, or the figures given by 

 Eeuss in his Bohm. Kreidef., pt. ii, pi. xxxiv, figs. 17-20. 



J Non N. caudata, Donovan, a recent species. 



§ Non N. ventricosa, Hinds, 1843, a recent species of Nuculana. Pictet and Campiche consider Meek and 

 Hayden's species to be a NeBra. Meek in his Check-list does quote a JVecsra ventricosa, M. and H. ; is this the 

 same species or not ? 



II Non N.parva, Sow. = Nuculana minuta, Miiller, from the northern seas. 



