52 PROCEEDINGS OF THE ACADEMY OP 



Lea's description and figure must be sufficiently distinct in generic 

 character. 



In the Eocene catalogue published in the American Journal of 

 Conchology, Astarte minutissima was incorrectly referred to Pte- 

 romeris. This shell, and Cardita atomus, Deshayes, look much 

 alike externally. 



VETERICARDIA. 



This genus was improperly printed Vetocardia. and I here re- 

 store the correct orthography. 



V. crenalirata, PI. I., fig. 4. 



Venericardia dupiniana, from D'Orbigny, fig. 11. 



Stoliczka has figured a shell under the name of Cardita Jaguenoti 



which has more external resemblance to Venericardia than any 



cretaceous form known to me, but the hinge is different from that 



of Cardita or Venericardia, and also from that of the present 



genus. 



PLEUROMERIS. 

 P. tridentata (Cardita), Say. 



May be regarded as the type of this genus, which was described 

 in the Araer. Journ. of Conch., vol. III., p. 12. 



P. decemcostata, PI. I., fig. 8 



This is a Miocene species in which formation most of the species 

 are found, though the genus first appeared in the Eocene. I 

 refer to this genus Cardita Kickxii, G. chamaefoj^nis, Sowerby, C. 

 scat arts, C. analis, Phil. 



EULOXA. 



Equivalved; hinge of right valve having a long oblique bifid 

 tooth immediately under the apex, and one pyramidal thick dis- 

 tant tooth anteriorly, left valve with 3 distant cardinal teeth, one 

 under the apex oblique thick entire, posterior tooth slender and 

 very oblique, anterior tooth small, pallial line with a slight sinus ; 

 inner margin entire. 



E. latisulcata, PI. I., fig. 5. Proceed. Acad. Nat. Sciences, vol. xiv. p. 585. 



This genus essentially differs from Crassina in the thick an- 

 terior tooth of the right valve; in having 3 teeth in the left valve 

 and in having a dental pit in the right valve where Crassina has 



[June 25, 



