MARINE MOLLUSKS — MACGINITIE 109 



of 33911). There is also variation in the number and strength of the 

 axial plications, some shells having twice as many as others. All 

 possible combinations of these variations are represented in the shells 

 examined. 



Examination of the specimens of B. pemphigus orotundum in the 

 U. S. National Museum revealed that they are not a variety or sub- 

 species of B. pemphigus (Dall, 1921, p. 99) but of B. polare. Recourse 

 to the original description of B. orotundum Dall (1907, p. 152) further 

 revealed that Dall himself stated that B. orotundum is an extremely 

 ventricose form of B. polare. Placing var. orotundum under B. pem- 

 phigus apparently was the result of confusing the specific names of 

 B. polare and B. pemphigus. The type of B. orotundum is an excep- 

 tionally large and ventricose B. polare and there are all gradations 

 between it and typical B. polare. The var. orotundum has the com- 

 paratively small nucleus of B. polare, bearing little resemblance to 

 the very broad, blunt nucleus of B. pemphigus. 



Distribution: From Bernard Harbor and Point Barrow south to 

 the Aleutians; also eastern Siberia and Kamchatka. 



Buccinum angulosiim Gray, 1839 

 And varieties norTnale, subcostatunii and transliratum Dall 



Plate 10, figure 10; Plate 11 



Buccinum angulosum Gray, 1839, p. 127, pi. 36, fig. 6. — Oldroyd, 1927, pt. 1, 

 p. 255, pi. 5, figs. 1-3; pi. 17, figs. 9, 10.— Morris, 1952, p. 122, pi. 28, fig. 22 

 [=var. subcostatum]. 



Buccinum angulosum normale Dall, 1885b, p. 179, pi. 3, fig. 1. — Oldroyd, pt. 1, 

 p. 255, pi. 5, fig. 6. 



Baccinum angulosum subcostatum Dall, 1885b, p. 179, pi. 3, fig. 2. 



Buccinum angulosum var. cnismatopleura Dall, 1919b, p. 328. 



Buccinum angulosum var. transliratum Dall, 1919b, p. 328. 



Buccinum cnismatopleura Dall, 1925, p. 7, pi. 4, fig. 4. 



Buccinum angulosum cnismatopleura Oldroyd, 1927, pt. 1, p. 255, pi. 12, fig. 4. 



Five specimens of true B. angulosum were collected : 2 (48 mm. and 36 

 mm. high) were washed ashore; 1 (55.5 mm.) was dredged at Eluitkak 

 Pass; 1 (59 mm.) at 522 feet; and 1 was taken on May 17, 1950, at a 

 depth of 64 feet by means of a trap lowered through a hole in the ice. 



Twenty-six specimens of var. subcostatum were collected: 13 (18.5 

 to 50 mm.) were taken in screen traps between March 10 and June 

 13, 1950, at depths of 37 and 64 feet; 9 (12 to 51 mm.) were dredged 

 at Eluitkak Pass (on three different days); and 2 (14 mm. each) were 

 dredged at 110 feet on Sept. 8, 1948. 



Sixteen specimens of var. transliratum were collected: 13 (36 to 

 51 mm.) were taken in screen traps between Mar. 20 and June 6, 

 1950, at depths of 37 to 80 feet; and 1 (51.5 mm.) was dredged at 213 

 feet. 



