MARINE MOLLUSKS — MACGINITIE 67 



The two chitons were both fairly common and, with the exception 

 of Eluitkak Pass, were taken at most stations that afforded suitable 

 places for attachment. 



The cephalopods are of interest in that both the squid (Gonatus) 

 and the Benthoctopus are new to the Arctic and the Cirroteuthis is un- 

 doubtedty a new species. 



The pelecypods are represented by 16 famihes,^ comprising 25 gen- 

 era and 37 species, plus several varieties. The family Nuculanidae is 

 represented by 2 genera ^\■ith 6 species, the Mytilidae and Tellinidae 

 each by 2 genera and 4 species, the Leptonidae by 3 genera and 

 3 species, and the Hiatellidae by 2 genera and 3 species. Five famihes 

 are represented by only one species. 



The collection contained 3 new species that have been described, 

 plus 1 new name, and undoubtedly 4 new species that are still unde- 

 scribed. One of the latter is the deep sea octopus and the other three 

 belong to the Turridae, a family that is being worked on by a retired 

 malacologist. 



Of the 107 species and 11 varieties (exclusive of the new species) 

 listed in the above table, 59 species and 7 vai'ieties are new to Point 

 Barrow, and of this number 3G species and 7 varieties are new to 

 Arctic Alaska and 18 species and 4 varieties are new to Arctic America. 

 Exclusive of the new species, only 4 are new to North America. 



A total of 17 species (including the new ones) and 4 varieties have 

 been reported only from the Arctic area of the eastern Pacific, 12 

 species and 1 variety only from the Arctic area of the western Atlantic. 

 Only 4 species, t^^-^ic&X Buccmum angulosum , Margaritopsis? grosvenori, 

 Raphitoma amoenal, and Nuculana arciica, and 2 varieties, B. angulo- 

 sum var. normale and var. subcostatum, have been reported only from 

 the Arctic. The fact that fewer species have been reported only from 

 the Arctic on the east coast of North America than on the west coast 

 may be the result of more collecting on the east coast. 



One could make a summary of the number of species taken from the 

 various depths but it would have little value. Aside from the factor 

 of a suitable substratum, the number of species taken at the various 

 depths outlined above reflects fairly well the amount of dredging that 

 was done. The depths between 110 and 184 feet yielded more species 

 than any of the others, but these depths represent 29 dredging sta- 

 tions, whereas the depths between 204 and 295 feet represent only 5 

 stations, the depths of 328 and 341 feet only 2 stations, and those be- 

 tween 420 and 477 feet onlv 4 stations. 



• Nlcol's (1955) analysis of the MacGlnltie collection of pelecjiiods from Point Barrow was bsged on an 

 incomplete and Incompletely identified collection. The collection contains 4 families, 7 genera, and 8 species 

 In addition to those listed by Nleol. The number of individuals in the genera listed was also based on an 

 Incomplete collection. The collection was made by G. E. MacQinltie, not by Mrs. MacGlnltie as stat«d 

 in the paper. 



