BUCCINIDAE 111 



3 to 4 inches in length, characteristically sinistral (left-handed), 4 

 whorls, with the smoothish nucleus indented. Sculpture of 6 to 12 very 

 oblique, low, rounded axial ribs and numerous (often paired) raised spiral 

 threads. Color ash-gray with a light brownish yellow periostracum. Interior 

 of aperture tinted with tan. Operculum much smaller than the aperture. 

 Dextral (right-handed) specimens are rarities. Fairly common in deep water. 



Genus ]umala Friele 1882 

 (Bermgius Dall) 



Jumala crehricostata Dall Thick-ribbed Buccinum 



Figure 51b 



Alaska. 



4 to 5 inches in length, moderately heavy, with 5 to 6 whorls. Charac- 

 terized by the very strong, rounded spiral cords (3 to 4 between sutures) 

 which on the base of the shell tend to be flat-topped. Periostracum grayish 

 brown, thin and semi-glossy. A very handsome, but not commonly acquired 

 species which occurs from 80 to 100 fathoms. 



Jumala keitnicotti Dall Kennicott's Buccinum 



Figure 5ig 



Alaska. 



5 to 6 inches in length, not very heavy. Characterized by about 9 strong, 

 arched, somewhat rounded axial ribs extending from suture to suture, and, 

 on the body whorl, extending % the way down the whorl. Spiral sculpture 

 of microscopic scratches, except on the base where there are a dozen or so 

 weak threads. Periostracum light-brown, thin, and usually flakes off in dried 

 specimens. Shell chalky and whitish gray in color. Not uncommon in sev- 

 eral fathoms of water; rarely in very shallow water. 



Genus Coins Roding 1798 

 Cohis stimpsoni Morch Stimpson's Colus 



Plate 23X 



Labrador to off North Carolina. 



3 to 5 inches in length, fusiform, moderately strong, chalk-white in 

 color, but covered with a semi-glossy, light- to dark-brown, moderately thin 

 periostracum. Length of aperture about half the length of the entire shell. 

 Sculpture of numerous incised spiral lines. Fairly common from i to 471 

 fathoms. 



