OF CONCHOLOGY. 15 



BOTE ON THE GENUS GADUS, WITH DESCRIPTIONS 



OF SOME NEW GENERA AND SPECIES OP 



AMERICAN FOSSIL SHELLS. 



BY T. A. CONBAD. 



DENTALIID^. 



GADUS, Montagu? Rang. 1829. 

 Helonyx, Stimpson, 1865. 



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

 iind no sucli genus in Montagu's Conchology. Deshayes 

 quotes it, Gadtis, 'Ro.ug. Dr. Stimpson remarks, that G.clava 

 ius, Gould, is the only living species; but O. 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.pusiUum [Ditrupa?), 

 Gabb ; IJ. subcoarctata [Ditrupa), Grabh-^ and I), 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. Janherti [Pyrula), Grateloup, very 

 closely allied to E. -i-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, Cancellaria am- 

 pullacea^ Brocc, is allied to (■. hiplicifera, Con. ; Gyprxa annn- 

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

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

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

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

 bis, Conrad, an American Miocene o-enus. 



