1879.] NATURAL SCIENCES OF PHILADELPHIA. 221 



ber of its costae (about 29 instead of 34), but on an examination 

 of numerous French specimens I found the number to be frequently 

 only 29. 



Cardium Nicolleti, Conrad. J. A. N. S., viii. p. 190. 



This Cardium will, I believe, on close examination prove to be 

 the G. semigranulatum of Sowerby (Mineral Conchology, II. p. 

 99). It does not differ from a species of Cardium in the Academy 

 Museum marked "0. semistriatum, London Clay," but as the C. 

 semistriatum, Deshayes, differs in the arrangement of its granu- 

 lated striae from the specimen in question marked semistriatum, 

 and as the last agrees in characters with the description accorded 

 by Sowerby to C. semigranulatum, it is highly probable that the 

 names have been simply reversed. 



Corbis (Gafrarium) lirata, Con. A. J. Science, I., 2d ser. p. 401. 



This species was originally described by Conrad as the C. lamel- 

 losa, Lam., with the characters of which it was found to agree in all 

 essential respects. I have been unable to note any material differ- 

 ence between the two species in question, and do not hesitate, after 

 an examination of a number of specimens representing Lamarck's 

 type, to unite the two under the one specific name of lamellosa. 



Limopsis ellipsis, Lea. Contr. p. 78, pi. 3, fig. 56, as Pectuncnlus. 



This species closely resembles in general characters the L. 

 (Sfalagmium !) Nystii of Galeotti, from which it mainly differs in 

 the greater number of teeth both in the anterior and posterior 

 series, the number in each series rarely falling below twelve. 



Limopsis aviculoides, Con. Foss. Shells of Tert., p. 39, as Pectunculus. 

 (Pectunculus obliquus, Lea.) 



Bronn (Index Palaeont., ii., p. 936) allies this species with the 

 Limopsis nana of Deshayes, from which it differs very materially 

 in the greater elevation of the umbones and cardinal region. Nyst 

 considers it as closely related to Trigonocselia auritoides, Gal., 

 but the obliquity in form is much greater in the American species. 

 It differs from the Limopsis aurita of Sassi {Area aurita, Broc- 

 chi, " Conchiologia Fossile Sabapennina" ii., p. 485) in having a 

 crenulated margin. 



Corbula oniscus, Con. A. J. Science xxiii., p. 341. 

 C. Murchisonii, Lea. 



This species is referred by Bronn (Index Palaeont.) to the G. 

 rugosa of Lamarck, to the description of which, as given by Pes- 



