NO. 2295. NEW NORTH PACIFIC MOLLUSKS—DALL. 311 



VOLUTOPSIUS DIMINUTUS, new species. 



Shell small for the genus, pale flesh color, with six whorls, of which 

 about two (decorticated) belong to a swollen nucleus apically blunt; 

 the spire is rather attenuated, the whorls moderately rounded, the 

 suture narrow and deep; surface in front of the suture smooth halfway 

 to the periphery on the last whorl then spirally sculptured with 

 numerous shallow grooves, with much wider flat interspaces, the 

 grooves almost punctuate b}^ the incremental sculpture which also 

 gives them a more or less minutely irregular course and transversely 

 striates the interspatial surfaces; aperture lunate, the outer lip 

 somewhat expanded and thickened, the body and pillar callous, the 

 canal short and wide, a little recurved; height of shell, 42; of last 

 whorl, 31; diameter, 21 mm. U. S. Nat. Mus. Cat. No. 206829a. 



Type-locality. — U. S. Bureau of Fisheries station 4844, in the 

 Japan Sea, in 116 fathoms. 



BERINGIUS CREBKICOSTATUS, new variety UNDATUS 



Specimens (mostly young) differing from the typical form in having 

 about 17 arcuate rounded ribs extending from the constricted suture 

 to the periphery and obsolete on the base; there are also more numer- 

 ous (about 18) spiral ridges, smaller and of course much closer together 

 than in the case of the typical form. The apex of the largest specimen 

 (about two-thirds grown) is defective, but there are five completed 

 whorls, measuring 78 mm. long and with a diameter of 35 mm. 

 U. S. Nat. Mus. Cat. No. 223031. 



Type-locality.— U. S. Bureau of Fisheries station 4224, at Cygnet 

 Inlet, Boca de Quadra, Alaska, in 160 fathoms, mud; bottom tempera- 

 ture, 43.7° F. 



BERINGIUS KENNICOTTII, new variety INCISUS. 



Shell resembling the typical form but more slender and with the 

 spiral sculpture very sharply emphasized, the striae becoming grooves 

 and the base coarsely threaded. Height of immature shell, 75; of 

 last whorl, 50; diameter, 35 mm. U. S. Nat. Mus. Cat. No. 110488. 



Type-locality. — U. S. Bureau of Fisheries station 4779, on Petrel 

 Bank, Bering Sea, in 54 fathoms, gravel. 



In a large series of the typical B. Icennicoitii I find the axial ribs 

 varying in number on the last whorl from 9 to 19 ; the specimens with 

 the more numerous ribs and inflated whorls, being usually females 

 who have to carry the material for the large ovicapsules. 



BERINGIUS MARSHALLI, new species. 



Shell large and thin, livid flesh color, with a dehiscent, thin, pale 

 brownish periostracum; suture distinct, constricted, the whorl 

 slightly flattened in front of it; spire attenuate with seven whorls 



