544 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. 
thoiigli both species have the same nunil)er of whorls. At ai^y rate, if 
either name is to be changed the Atlantic species will have to take 
Eschscholtz's name. 
The o-eographical range of this form is from the north end of Niinivak 
Island, Bering Sea, on the verge of the arctic fauna, south to Mendo- 
cino County, California, in 2 to 50 fathoms; also on the northern coast 
of Japan in ?> to 43 fathoms. Some of the rlapanese specimens collected 
by Capt. St. John, li. N., measure 46 mm. in length, with six whorls 
and nine varices. 
BOREOTROPHON BERINGI, new species. 
Shell greenish white, elegantly ovate-fusiform, with a rather elon- 
gated curved canal, the aperture and canal longer than the spire; 
whorls with the base gradually attenuated, not constricted, about six 
in number, with a distinct but not deep suture and 9 to 12 low sharp 
rounded varices, with no obvious angle at the shoulder; surface with 
fine revolving striation, sometimes partly obsolete; aperture white; 
long., 40; max. lat., 17; long, of spire above aperture 16 mm. 
Operculum dark brown. 
The geographical range of this species is from the north end of 
Nunivak Island, Bering Sea, to Cook's Inlet on the southeast and 
northern -lapan on the southwest in 2 to 81 fathoms. U. S.N.M. 109051. 
This is the shell regarded by Jeffreys, Adams, and Carpenter as 
B. (iathratus in the north Pacific area; but if well-developed adult 
specimens be compared it will be seen that they are really not very 
similar. The .young B. heringl are notebly short and broad, and often 
show a pinkish tint with the varices whiter. 
BOREOTROPHON PACIFICUS, new species. 
This species resembles the preceding in miniature except that it has, 
with the same number of whorls, closer and more numerous varices, 
and the throat is sometimes pale brownish. The varices number from 
15 to 20, and the largest specimens measure from 20 to 27 mm. in 
length. The average length appears to be about an inch when adult. 
The species is the faunal analogue of B. trancatns Strom, of the 
Atlantic fauna, but differs from it by the absence of the spiral 
sculpture and larger size. 
The geographical range of B. paclficm is from the Sea Horse 
Islands, in the Arctic Ocean, south through Bering Sea and along the 
coast of Alaska as far as Sitka Harbor, in 5 to 60 fathoms. It is the 
commonest Pacific coast species, and has been called by Dr. Carpenter 
Trophon scalariformis on his labels, but it is not the scalarlformis of 
Gould. Jeffreys labeled it usually as Trophon truncatus. U. S.N.M. 
109100. 
