MARINE MOLLUSKS — MACGINITIE 143 



Family Clionidae 



Genus Clione Pallas, 1774 



Clione limacina (Phipps, 1774) 



Clio limacina Phipps, 1774, p. 195. 



aione limacina Gould, 1870, p. 507, fig. 754.— G. Sars, 1878, p. 332, pi. 29, figs. 

 4a-e.— Odhner, 1907, p. 95.— Pratt, 1935, p. 578, fig. 758 (after Gould). 



During the summers of 1949 and 1950 this species was taken 

 sparingly, but during the summer of 1948 it was very abundant, 

 especially on August 12 when it was seen alongshore in enormous 

 numbers, together with ctenophores, medusae, and jell3'^fishes. 



Discussion: During the winter of 1949-1950, vehger larval forms 

 of this species were taken in vertical plankton hauls through the ice. 

 Throughout the entire winter they appeared to be in a state of 

 suspended growth, for all of the larvae taken were the same size. 

 However, on June 23, 1950, 4 large adults, about 38 mm. in length, 

 were taken in a screen trap lowered through the ice where the water 

 was 37 feet deep. On July 7, 1950, a larval form 7 mm. in length, 

 that was still propelhng itself by means of ciha, and a specimen 30 mm. 

 in length were taken. About this time young C. limacina were 

 becoming common alongshore. 



Distribution : This is a Boreal-Arctic species that has been recorded 

 in Pacific waters from northern Bering Sea south to the Pribilofs and, 

 rarely, in the Aleutians, hence not farther south than lat. 52° N.; in 

 eastern Atlantic waters it has been recorded from the White Sea, 

 Jan Mayen, Spitzbergen, the British Isles, and the Faroes — as far 

 south as lat. 35° N.; and in the western Atlantic (Johnson, 1934) 

 from Davis Strait to lat. 37^ N. In view of its abundance at Point 

 Barrow, it is surprising that it has not been recorded previously 

 from north of Bering Sea. 



Suborder Nudibranchia 



Division Doridacea (=Holohepatica) 



Family Dorididae 



Genus Aldisa Bergh, 1878 



Aldisa zetlandica (Alder and Hancock, 1855) 



Doris zetlandica Alder and Hancock, 1855, pt. 7, and appendix, p. 42. — G. Sars, 



1878, p. 305, pi. 27, figs. la-b. 

 Aldisa zetlandica Odhner, 1907, p. 67. — Alder and Hancock, 1910, p. 105, pi. 1, 



figs. 3, 4. 



Six specimens were collected: 1 (32 mm. long by 30 mm. wide, 

 when somewhat contracted) was dredged from a sandy-muddy bottom 



