OF CONCHOLOQY. 15 



NOTE ON THE GENUS GADUS, WITH DESCRIPTIONS 



OF SOME NEW GENERA AND SPECIES OP 



AMERICAN FOSSIL SHELLS. 



BY T. A. CONKAD. 



DENTALIIDJE. 



GADUS, Montagu? Rang. 1829. 

 Helonyx, Stimpson, 1865. 



This genus is attributed to Montagu by Bang, but I can 

 find no such genus in Montagu's Conchology. Deshayes 

 quotes it, Gadus, Rang. Dr. Stimpson remarks, that G. clava- 

 ius, Gould, is the only living species; but G. gadus, Montagu 

 informs us, is a "pelagic species, found in many parts of the 

 British Channel, adhering to the log (lead) line ;" and a few- 

 others were obtained by Cuming in America seas. The genus 

 makes its first appearance in the Eocene of Europe and Amer- 

 ica. The American fossil species are : — D. pusilluni (Ditrupa ?), 

 Gabb; J), subcoarctata (Ditrupa), Gabb; and D. thallus, Con- 

 rad. There are three species in the Paris Eocene. 



ECPHORA, Conrad. 



There is one species only in America, and one in the Mio- 

 cene near Bordeaux, E. Jauberti (Pyrula), Grateloup, very 

 closely allied to E. 4:-costata, Say, but having three ribs, whilst 

 the latter has invariably four. There is a remarkable affinity 

 among a number of the Dax and Italian fossils with the Mio- 

 cene shells of North America ; for example, Gancellaria am- 

 pullacea, Brocc, is allied to C. biplicifera, Con. ; Gyprcea annxt- 

 laria, Brong., to G. annulifera, Con. ; G. leporina, Gray, Lam., 

 to G. Carolinensis, Con.; the species of Trochita near Dax, er- 

 roneously referred to trochiformis, is allied to T. perarmata, 

 Con. Nerita carinata, Brocchi (Italy), is a species of Garinor- 

 bis, Conrad, an American Miocene genus. 



