32 



202 = Leda longifrons, Coxrad, Jour. Acad. Kat. Sci. sec. ser. IV, 281, 



xlvi, 18. 



203 := Leda pinnaeformis, Gabb, ib. 303, xlviii, 22. 



204 = Leda protexta, Gabb, ib. 23. 



205 = Leda Slackiana, Gabb, ib. 397, Ixviii, 36. 



206 = Leda subangulata, Gabb, Synop. Mol. Cret. 1861, 133. 



263 = Avicula abrupta, Cokead, Jour. Acad. Kat. Sci. sec. ser. II, 274, 



V, 6. 



264 = Avicula convexo-plana, Roemer, Kreid. Vou. Tex. 1852, 61, 



vii, 9. 



265 = Avicula cretacea, Conrad, Kicollett's Report, 1845, 169. 



266 = Avicula Haydeni, Hall & Melk, Mem. Am. Acad. Arts and Sci. 



sec. ser. V, 382, 1-5. 



267 = Avicula iridescens, Shumard, Proc. Boston Soc. Kat. Hist. Sept. 



1S61. 



268 = Avicula laripes, Morton, Synop. Org. Rem. 1834, 63, xvii, 5. 



269 = Avicula linguiformis, Evans & Shumard, Proc. Acad. Kat. Sci. 



Phila. Ib55, 163. 



270 = Avicula nebrascana, Evans & Sudmard, Trans. St. Louis Acad. 



I, 38. 



271 = Avicula pedernalis, Roemer, Kreid. Vou. Tex. 1852, 62, viii, i. 



272 = Avicula petrosa, Conrad, Jour. Acad. Kat. Sci. sec. ser. II, 174, 



xxiv, 15. 



273 := Avicula planisulca, Roemke, Kreid. Vou. Tex. 1852, 62, vii, 7. 



274 =: Avicula. subgibbosa, Meek & Hayden, Proc. Acad. Nat. Sci. 



Pliila. IbGO, 180. 



275 =: Avicula triangularis, Evans & Shumard, ib. 1855, 163. 



320 = ACTINOCERAMUS, Meek. Type Inoceramus sulcatus, 

 Parkinson, Geol. Tr. V, 59. This name is proposed for a small 

 section of Inocerami, with a short hinge, and radiating plica- 

 tions or costae. 



324 — This and the following species, placed in the catalogue under the 

 name Modiohi, belong to- Volsella, Scopoli, 1777, and should be 

 called Volsella attenuata, V. concentrico-costellata, &c. They 

 also belong to Perna, Adansou, 1757, if his genus should be 

 adopted with the first species as its type. 



336 = Modiola granulato-cancellata, Roemer, Kreid. Vou. Tex. 1852, 

 54, vii, 12. 



377 = LIOPISTHA, Meek. Type Cardium elegantulum, Roemer, 

 Kreid. Vou. Tex. 1852, 48, 5. 



The shells embraced in this group, which seems to be peculiar 

 to the Cretaceous system, have, according to Mr. Conrad, tlie 

 hinge of Papyridea, Swainson. They dilfer, however, from the 

 type of that genus {Cardium hullatum, Linn.) in being closed 

 and without costae on the postero-dorsal region, or crenulatious 



