100 AMERICAN JOURNAL 



Hemifcsus Hornii, H. Cooperii and H. Eemondii, Gabb, 

 and Ficus mamillatus, Gabb are members of my proposed 

 genus Ficopsis, of the family Sycotopydae, though the two 

 former species are aberrant, and may be regarded as a sub- 

 genus, or even a distinct genus of Sycotopydse* Hemifusus, 

 I believe, has never been found in a fossil state. 



NATICID^. 



Amauropsis alveata, Gabb, is a member of Lamarck's 

 genus, Ampullina, {Globulus, Sow.; Olohularia, Swains.) It 

 it quite distinct from the shell figured by Mr. Gabb as the 

 same in Division A. My species was published in 1856, and 

 it is only withina year, I worked out from a piece of limestone, 

 the first specimen of this genus known in the Eastern Eocene. 

 Ampullina, like Natica and Lunatia, never has revolving 

 lines. A. alveata, Con., has a shorter aperture than Mr. Gabb's 

 species, and a broadly refiexed pillar lip. 



ASTARTID^. 



Venericardia Hornii, Gabb, is a very different variety 

 (or species?) from the V. planicosta as figured in the Pacific 

 Railroad Reports. The latter is more close to the typical F. 

 planicosta, and comes certainly from an Eocene rock. 



VENERID^. 



DosiNiA. As the three species referred to this genus by 

 Mr. Gabb, are without figure or description of the hinge, their 

 generic characters are unknown. I should not be surprised 

 if D. inflata has the hinge character of Cyprinella. 



DosiNiOPSis, Conrad. European species, Oyprina planata, 

 Sowerby ; Vemis plana, Sowerby. A genus of the Senonien 

 and Older Eocene. American species, D. alta, Con., D. lenti- 

 cularis, Rogers, D. Meekvi, Con. {D. alta, Gabb, not Conrad), 

 all of which are Older Eocene species. 



Hamites Vancouverensis, pi. 18, fig. 18, I believe to be 

 an Ancylocerus. 



Ptycoceras ^quicostatus is more likely to be Hamites. 



Neptunea curvirostris, pi. 18, fig. 37, I believe to repre- 

 sent an undescribed genus. 



Lysis, Gabb. This genus is related to Carinorhis, Conrad, 

 {Glathrella, Recluz.) 



* There are some other Eocene forms in Europe allied to these, which I 

 think may constitute a genus, Priscoficus. Examples : P. inter mediae Mel- 

 ville ; P. Smithii Sowerby. 



