104 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 109 



wider bands than usual; in a few the bands of striae are coarser and 

 have deeper and wider interspaces. 



On the whole, the Point Barrow specimens are fauiy typical, but 

 a few run the gamut of variations. In only a few are the carina and 

 angle insignificant, but in one from 125 feet (39.2 mm. high) there is 

 no carina and the whorl is not angled at the termination of the axial 

 folds. An adult shell from 150 feet (65 mm. high) has a small carina 

 and almost no angle; one from 184 feet (42.5 mm. high) has 2 carinae 

 with a suggestion of a third between these two in the last half of the 

 last whorl. The more posterior of these 2 carinae is not half the 

 size of the anterior one but practically all of the axial folds terminate 

 there instead of at the stronger one, which is in the customary position 

 about the middle of the whorl. 



A shell measuring 48 mm. high by 24.6 mm. in diameter, with an 

 aperture 20 mm. long and a spire 28 mm. long, that was dredged 

 from 125 feet (pi. 9, fig. 6) has certain characteristics of B. donovani 

 Gray: the spire is long and slender and the aperture is relatively 

 short; there is no keel at the shoulder, merely a suggestion of a carina. 

 The axial folds are strong and terminate at the shoulder. The shell 

 is heavier and the whorls less convex than in B. donovani that I have 

 examined, and it lacks the patulous aperture and sinuated outer lip 

 of B. donovani. It is imdoubtedly a variant of B. glaciale rather than 

 of B. donovani. 



Distribution: Point Barrow to Juan de Fuca Strait; Johnson 

 (1934) gives the Atlantic range as Greenland to the Gulf of St. 

 Lawrence; Thorson (1944) also lists it from Jan Mayen, Spitzbergen, 

 the Kara and Barents Seas, Franz Joseph Land, Novaya Zemlya, 

 and the Siberian Arctic; also Kamchatka and Japan. 



Variety morchianum Dunker, 1858 



Plate 9, figures 7, 10, 13 



A total of 10 shells, at least half of which were living, were collected: 

 1 small dead shell washed ashore; 1 dead shell (67.4 mm., the largest) 

 and 2 living (19.5 mm. and 21 mm.) came from 130 feet; 2 living 

 (17 mm. and 47.5 mm.) from 175 feet; 1 living (33 mm.) from 213 

 feet; 1 hving (65 mm.) from 477 feet; 1 recently dead (65.5 mm.) 

 from 453 feet; and 1 living (25.7 mm.) from 522 feet. 



Other material examined: About 40 specimens from the Prib- 

 ilofs, the Aleutians, and Cook's Inlet, and 1 from Cape Prince of 

 Wales. 



Discussion: This is the shell that was described by Dall in 1919 as 

 B. glaciale var. parallelum. It differs from typical B. glaciale in that 

 the spiral striae are usually somewhat coarser and tend toward fewer 

 per band, with less pronounced and narrower interspaces between 



