100 PROCEEDINGS OF THE NATIONAL MUSEUM tol. io» 



or less, 65 have from 13 to 16, and 30 have from 17 to 23. Thus it is 

 obvious that relatively few have the small number of varices (9 to 12) 

 given in the original and subsequent description. (The specimen from 

 Puget Sound does not look like B. heringi.) 



Distribution: From Point Barrow through Bering Strait to the 

 Aleutians and Puget Sound (?). Point Barrow is a new locality. 



Boreotrophon pacificus (Dall, 1902) 



Plate 7, figures 13, 14 



Trophon pacific Dall, 1902, p. 544; 1921, p. 110, pi. 11, fig. 5. 

 Trophon pacificus Oldroyd, 1927, pt. 2, p. 35, pi. 30, fig. 4. 

 Boreotrophon pacificus Abbott, 1954, p. 208, fig. 46f. 



Two living and 19 dead specimens were collected: 11 empty shells 

 washed ashore during August and September 1949 and the remaining 

 8 empty shells were taken from depths of 80 to 741 feet; the 2 living 

 specimens came from 217 and 741 feet. The one from 217 feet was 

 practically covered with the hydroid Syncoryne. 



Other material examined: Numerous specimens from the Aleu- 

 tians, Kodiak Island, and Port Etches, Alaska. 



Discussion: I am not at all confident that I have in every instance 

 been able to distinguish between specimens of B. heringi and B. paciji- 

 cus (see also B. truncatus). DaU's distinction of more varices in B. 

 'pacificus than in B. heringi is of no value, for he selected for his type 

 of B. heringi a specimen with few varices. The Point Barrow speci- 

 mens of B. pacificus have from 15 to 24 varices, the majority having 

 from 16 to 21, covering practically the same range as in B. heringi. 

 Nor is the statement that B. pacificus "resembles T. heringi in minia- 

 ture" very useful, for there are small specimens of B. heringi. I at- 

 tempted separating these species on the basis of the nucleus and the 

 length and shape of the canal. The nucleus of B. heringi seems to be 

 larger and blunter than that of B. pacificus. The canal of B. heringi 

 seems to be relatively longer and more arcuate than in B. pacificus, 

 but a B. heringi with an unusually short canal or a B. pacificus with 

 an injury that causes the canal to curve more than usual makes this 

 distinction useless. 



Distribution: This species is said to occur from the Arctic Ocean 

 southward through Bering Sea, the Aleutians, Kodiak Island, and 

 Hinchinbrook Island; Kamchatka; and in deep water off California 

 and Acapulco, Mexico (Dall, 1921, p. 110; Burch, 1945, vol. 2, pt. 1, 

 No. 51, p. 58), but none of the collecting records is from north of 

 Bering Strait. The specimens from Point Barrow, therefore, extend 

 the range of B. pacificus into the Alaskan Arctic. 



