MARINE MOLLUSKS — MACGINITIE 79 



several publications the type locality of M.frigidus is given as "north 

 of Bering Strait." The type specimen is from the north end of 

 Nunivak Island, which is 5° south of Bering Strait. 



Margaritas vahli (Miiller 1842) 



Plate 4, figures 8, 9 



Margarita vahlii MoUer, 1842a, p. 8; 1842b, p. 81. — Odhner, 1912, pp. 17, 67, 

 pi. 3, figs. 35-40; pi. 6, figs. 6-7. 



Approximately 25 specimens of this species were collected from 

 depths ranging from 120 to 741 feet. The largest specimens (3.4 

 high by 3.8 mm. wide, and 4.3 by 4.7 mm.) came from 741 feet. The 

 next largest (3.2 by 3.4 mm.) came from 477 feet and another of the 

 same height came from 453 feet. The remaining specimens were 

 small: 2 (1.5 by 1.8 mm.) from 420 feet; 1 (1.5 mm. high) from 453 

 feet; 5 (from 1.5 to 3.2 mm. high) from 175 feet; and 5 (from 1.8 to 

 2.8 mm. high) were found among a foliaceous bryozoan at 120 feet on 

 Sept. 15, 1949. 



The ovaries of two specimens (4.3 mm. and 3.0 mm. high, respec- 

 tively) from 741 feet were well filled with large eggs. Judging from 

 the large size of its eggs, it is probable that this species has a short 

 pelagic larval development. 



Other material examined: Five specimens from Spitzbergen and 

 eight from Greenland. 



Distribution: Parry Islands, Labrador, Greenland, Iceland, and 

 Spitzbergen (Thorson, 1944). The discovery of this species at Point 

 Barrow materially extends its range westward. It is new to Arctic 

 Alaska. 



Genus Margaritopsis Thiele, 1906 

 Margaritopsis pribilqffensis (Dall, 1919) 



Plate 2, figure 10; Plate 8, figure 1 

 Margarites pribiloffensis Dall, 1919b, p. 366. 



Tlu'ee living specimens and two worn shells were collected. The 2 

 shells (5.7 and 5.2 mm. w4de, respectivel}') and 1 living individual (7.5 

 high by 7.4 mm. wide) came from 741 feet, and 1 living juvenile about 

 1,0 mm. wide and another about 3.6 mm. wide came from 477 feet. 

 Both of these stations were characterized by muddy bottoms and 

 masses of terebellid worm tubes. 



Other material examined: The type, from near the Pribilof 

 Islands; one specimen from near Point Belcher, and another from 

 Bernard Harbor, Northwest Territories. 



Distribution: As above. Point Barrow is a new locality. 



