NO. 9 MARINE INVERTEBRATES, ALASKA — MacGINITIE I7I 



males on September 26) ; and 2(1 ovigerous male) on October 2. It 

 is a circumpolar species, and this is the second record from Point Bar- 

 row and the western Arctic, Cole having reported it in 192 1. 



Fourteen specimens of Nymphon longitarse Kroyer were picked 

 up on the beach between July 23 and October 2, 1949. One ovigerous 

 male with four bright tan egg sacs 2 mm. in diameter was taken on 

 September 12, 1949, and another on September 26. This is the second 

 record from Point Barrow and the western Arctic, Cole having re- 

 ported this species in 1921. 



One specimen of Phoxichilidium quadridentatum Hilton was found 

 among a mass of hydroids and bryozoans at Eluitkak Pass on August 

 10, 1948. The only other records of this pycnogonid are from San 

 Francisco, Stewart Island, and one from Point Barrow. 



Nineteen specimens of Pseudopallene circularis (Goodsir), 12 of 

 which were juveniles, were dredged as follows: i male at 80 feet, 

 2 at 125 feet, and 2 at no feet (September 15, 1948) ; i juvenile at 

 no feet (September 16, 1948), 3 at 420 feet, i at 184 feet, and 2 

 at 217 feet ; i male at 341 feet, i male and 4 juveniles at 453 feet, and 

 I juvenile at 175 feet. The male taken on September 9, 1948, was 

 carrying young just ready to escape. (Stephensen, 1943a, reports an 

 ovigerous male from east Greenland on August 11, 1932.) This is 

 an Atlantic-Arctic-Pacific species. 



Tanystylmn anthomasthi Hedgpeth was dredged as follows : i fe- 

 male at 150 feet and i at 125 feet, and i male at 217 feet. This species 

 has been reported previously from Hokkaido, Japan, and from Point 

 Barrow. 



Phylum MOLLUSCA 



At least 128 species of mollusks, plus about 8 varieties, were col- 

 lected. The approximate number in each group is as follows : 



Pelecypods 30 plus 4 varieties 



Gastropods 89 



Pteropods 2 



Opisthobranchs 12 



Prosobranchs 70 plus several varieties 



Amphineurans 2 



Cephalopods 3 



There is so much variation in the Arctic mollusks that identifica 

 tion is often rendered extremely difficult. The complete synonymy 

 for some species would cover several pages. An example of the diffi- 

 culties encountered because of such great variation is given by Thor- 



