188 NEW WEST AMERICAN SHELLS — DALL. 



the edges of the lamellae sparsely fringed with projecting points. Upper 

 whorls with a space in front of the suture and three strong sharp cari- 

 nae, the first interspace wider than the others; on the last whorl are 

 seven or eight spirals, feebler anteriorly ; epidermis yellowish olive, 

 throat and i)illar white, canal very short, operculum straight, unciform. 

 Length of shell 33, of aperture 14, breadth of shell 18 millimetres. 

 U. S. Steamer Albatross, stations 3227 and 2919, off coast of Uualasbka 

 Island, Bering Sea, in 225 fathoms. 

 This may prove to be a distinct group from Chrysodomus proper. 



Chrysodomus (Sipho) hypolispus, sp. nov. 



Shell polished, brown, with rounded whorls sculptured only by a few 

 obsolete spirals and malleations with six or seven whorls, well rounded 

 to a distinct suture and rather acute spire ; canal very short and 

 strongly recurved, axis almost pervious ; outer lip sinuous, throat white, 

 a well marked callus ou the pillar and body. Length of shell 55, of 

 aperture 28, breadth of shell 2G millimetres. U. S. Steamer Albatross, 

 station 3254, in Bering Sea, Alaska, in 46 fathoms. 



Chrysodomus (Sipho) acosmius, sp. uov. 



Shell elongated, with six or seven whorls covered with a dull greenish 

 epidermis and spirally sulcate with rather distant narrow shallow 

 grooves, eighteen to twenty on the penultimate whorl ; suture distinct, 

 whorls flattened, canal very short and recurved ; aperture white, with- 

 out callus, lip hardly reflected. Length of shell 60, of aperture 25, 

 breadth of shell 23 millimetres. U. S. Steamer Albatross, station 3329, 

 off Unalashka Island, Bering Sea, in 400 fathoms. Many of the North 

 Pacific shells of this group appear to have very short canals. 



Chrysodomus (Sipho) halibrectus, sp. nov. 



Shell much like a miniature of the last, with six whorls which are 



less flattened, weaker and finer spiral strife, a longer canal, pink color 



on the ])illar, and more appressed suture ; the lip is thickened and a 



little reflected and there is a thin callus on the body. Length of shell 



35, of aperture 17, breadth of shell 13.5 millimetres. U. S. Steamer 



Albatross, station 3330, off coast of Akutan Island, Bering Sea, in 351 



fathoms. 



Trophon (Boreotrophon) scitulus, sp. nov. 



Shell, thin, small, white, five whorled; closely sculptured with 

 regularly spaced low imbricate lamellii3 rising to spines at regular inter- 

 vals on the spirals ; on the upper whorls two, and on the last whorl six 

 spirals, of which at the shoulder the hindmost bears the longest 

 spines and is separated from the suture by a wide space; there are on 

 the last whorl thirteen grooved spines on this spiral; canal long, re- 

 curved. Length of shell 17.5, of aperture 11, breadth of shell 8.5 milli- 

 metres. U. S. Steamer Albatross, station 3227, off coast of Unalashka 

 Island, Bering Sea, in 225 fathoms. 



