366 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 56. 



Type-locality. — Granite Cove, Port Althorp, Alaska, in 14 fathoms, 

 gravel; W. H. DaU. 



MARGAUITES HELICINUS, new variety ELEVATUS. 



Shell small, trochiform, polished, purple-brown, with a dark glassy- 

 nucleus and about five subsequent well-rounded whorls; suture dis- 

 tinct, rather deep; sculpture of evident incremental lines without 

 any spiral striae; base rounded with a small umbilical chink; aper- 

 ture simple, rounded, slightly angular at the suture, the body with a 

 well-marked glaze uniting the outer lips with a rather wide, white, 

 slightly reflected pillar lip; operculum brownish with about 10 turns; 

 arger diameter, 9; shorter diameter, 7; height, 6.5 mm. U. S. Nat. 

 Mus. Cat. No. 205833. 



Type-locality .—BQiXT Bay, Baranoff Island, Alaska, collected by Mrs. 

 Kate Stephens. This is closely related to the typical M. lidicinus, 

 but its form is more trochoid; it has a larger number of whorls and 

 its aperture more nearly circular. 



MARGARITES HELICINUS, new variety EXCAVATUS. 



Shell small, depressed, thin, polished, lurid flesh color with a darker 

 globular glassy nucleus, and about three subsequent whorls, on which 

 a few spiral lines of obscurely lighter color are sometimes apparent; 

 suture distinct, not appressed; surface with faint incremental lines 

 as the only sculpture; base rounded with, in the adult, a widel}^ ex- 

 cavated funicular umbilicus, aperture rounded, simple, more or less 

 patulous when mature; inner lip with a moderate coat of enamel 

 continued on to the pillar lip and slightly reflected there; larger 

 diameter, 9; shorter diameter, 5.5; height, 3.5 mm. U. S. Nat. Mus. 

 Cat. No. 219144. 



Type-locality.— Const2jQ.t\ne Harbor, Amchitka, Aleutian Islands, 

 collected by W. H. DaU. Also at Middleton Island, Alaska. 



MARGARITES PRIBILOFFENSIS, new species. 



Shell small, solid, trochiform, pale straw color, with a small glassy 

 nucleus and about five and a half subsequent well rounded whorls; 

 suture distinct, slightly appressed; surface duU, with fine incre- 

 mental lines crossed by extremely fine spiral striae; base well rounded 

 with a deep, not funicular umbilicus, aperture rounded, simple, the 

 outer lip produced at the suture and united with the pillar by a thin 

 glaze of enamel over the body, the pillar lip a little thickened, not 

 reflected; operculum brownish with eight or more turns; larger 

 diameter, 8.5; shorter diameter, 7; height, 8 mm. U. S. Nat. Mus. 

 Cat. No. 210130. 



Type-locality. — U. S. Fish Commission station 3504, near the 

 Pribiiof Islands, Bering Sea, in 34 fathoms, sand; bottom tem.pera- 

 ture, 37.8° F. 



