322 CEETACEOUS PELECYPODA 



12-13. — N. porrecfa, Rss., and siliq?ia,* Goldf., arc both narrow, posteriorly much produced, 

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



14-22. — N. frilinella, Rss., semilunaris, "B nch, product a, Nilss., (Favre, M- foss. de Lemberg, 

 1869, p. llS-f), Ma?/felli, Gcin., snljaqualis, 'Rs,s.,PuscJn.i, Alth, (vide Favre, M. foss. de Lemberg, 

 1869, p. 119), Fcersferi, Miill., WirlicJii and discors, Giimbel. The last species closely resembles 

 semilunaris, Buch. 



23-26. — N. angusla, Ryckh., acnlissima, 'M\i\\c\-,(!' caudata,% Koch and D., in Petref. Aach. 

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

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

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



27. — N. undulata, Sow., (Nucula ead., Sow., M. Conch., vi, p. 103, pi. 554, fig. 3, axALeda ead., 

 d'Orb., Prod. II, 130, No. 224). Pictet and Cam pic he place this species among the doubtful 

 forms, considering it to be a Ncara. 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 Corbula. As the shell is equivalve, it evidently does not belong 

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

 as yet wanting. 



28. — N. tenuirosfris, Rss., fLeda ead., a^nd 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 (Buhm. Kreidef., pt. II, p. 7). 



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

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

 differences in the shape of the two shells. 



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

 appears to be a Nucula than a Nuculana. 



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

 cosa,^ H. and M. ; Nuculana hisulcata, M. and H., longifrons. Con., pinnaformis, Gabb, juro- 

 texta, G., Slackiana, G., sutjangulata, 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 cultelliformis, Rog., Galhii, Con., improcera. Con., oregona, Shum., penita, 

 Co\\.,2Mrx:a,\\ Rog., Willametensis, '&\x\ixa., Neilo ? abrupt a. Con., Yoldia aevtifrons, Con., impressa. 

 Con., nasuta, Gabb, and protexfa. 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 crebrilineata of Conrad from Palcestiue ai-e identified by Fraas with Nuculana 

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

 p. 236). 



56-57. — Nucularia papi/ria and Perrisonota protexta are described by Conrad fromNew Jersej', 

 (Am. Jour. Conch., V, pp. 44 and 98). 



58-62. — Nuculana socialis, Nuculana sp. ind., Toldia striatula, T. obtiisata, and Y. scaphuloidea 

 occur in the South Indian cretaceous deposits. 



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



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

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



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



§ Non i\^. TC«<Wtu««, Hinds, 1843, a recent species of Nuculana. Pictet and Campiche consider -Meek and 

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

 same species or not ? 



{{ Non N.parva, Sow. = Nuculana wiiiufa, Miiller, from the northern seas. 



