MARINE MOLLUSKS — MACGINITIE 113 



Buccinum ciliatum Fabricius, 1780 



Plate 10, figures 8, 9 



Tritonium ciliatum Fabricius (not Gould), 1780, p. 401. 



Buccinum ciliatum Tryon and Pilsbry, 1879-1898. — Martini and Chemnitz, 1883, 

 ed. 2, vol. 3, abt. Ic, p. 29, pi. 78, figs. 5, 6. 



Six living specimens were taken from 8 stations ranging in depth 

 from 162 to 741 feet. The shells range from 15.5 mm. in height by 

 9 mm. in diameter (341 feet) to 33.5 by 19 mm. (420 feet). Three 

 empty shells were also found. 



Other material examined: 17 specimens from localities ranging 

 from Point Barrow (1 dead specimen) to Plover Bay, the north end 

 of Nunivak Island, and the Pribilofs; 1 specimen from the northeast 

 part of the Grand Banks, 1 from the southeast coast of Newfoundland, 

 1 from Murray Bay, Quebec; 12 from Greenland; 1 from Spitzbergen. 



Discussion: In slender specimens the aperture is shorter than the 

 remainder of the shell but in more squat specimens the aperture is 

 the longer. The specimens from Point Barrow range from slender 

 to squat. They are covered with a tan, hirsute periostracum that is 

 often worn off on the outer margins of the ribs. The specimen from 

 420 feet is tumid, with at least 17 ribs; a smaller one (29.5 by 16.5 mm.) 

 from 341 feet has about 19 ribs on the last whorl. Specimens ex- 

 amined from Plover Bay tend to be somewhat squat, with the aperture 

 longer than the remainder of the shell. 



The spiral sculpture varies from wide, flattish bands to prominent 

 ridges, with a thread in each interspace. Specimens examined from 

 Greenland were characterized by flatter, less pronounced sph-al sculp- 

 turing than the Point Barrow ones. About half of the Greenland 

 shells were nearly twice as heavy as the others of comparable size. 



Distribution: The localities mentioned above and, in addition, 

 the following: North of the mouth of the Mackenzie River, Baffin 

 Land, Labrador; Jan Mayan, Beeren Island, Novaya Zemlya; the 

 White Sea, the Murman Coast, the Siberian Arctic (Thorson, 1944). 

 Dall (1921) gives the Pacific range as "Point Barrow, Arctic Ocean, 

 south to the Aleutian Islands and eastward to the Shumagins." The 

 specimen from the Shumagins is a small, dead, eroded shell that does 

 not look like B. ciliatum. The most southerly specimen that I 

 examined came from off the Pribilofs. The present specimens are 

 the first living ones from Point Barrow and the second record from 

 north of Bering Strait. 



