KUNGL. SV. VET. AKADEM1ENS HANDLING AK. BAND 41. NIO 4. 



L3 



gin with a strong convexity. Striae broad, straight, at regular distances 

 from each other; colour mostly light yellowish. L. 10 mm. 1 



C. insculpta (Totten 1835). 

 Shell thick, almost opaque var. valida Leche 1878. 



2. Outer lip a little extended above, rounded; superior end of the shell ra- 

 ther broad; columellar margin with or without a very small convexity. 

 Striae linear, undulatory with irregular interspaces; colour reddish yellow 

 or brown. L. 7 mm. C. Reinhardti (Möller 1842). 



B. Shell broadest above the middle; superior end very wide; the striae more 

 close-set towards the outer margin, deeply engraved ; columellar margin usu- 

 ally bent to the left, whereby the sinus becomes less concave; colour whitish. 

 L. 9 mm. C. scalpta (Reeve 1855) = propinqua (M. Sars 1858). 



Shell of uniform breadth, the length not quite 3 times the breadth, both ends distinctly truncated: the 

 outer lip without slit at the suture, extended to the height of the apex, not beyond it: spiral sculpture very 

 indistinct. Colour milky-white and glossy. Radula? L. 4 nun. ('. discus Watson 188G. 



Diaphana Brown 1833. 

 Amphisphyra Loven 1846. 



I. Apex not perforated, broadly flattened; outer lip a little inflexed above the 

 middle. 



A. Length > breadth; columella vertically descendant or bent to the left; aper- 

 ture not extremely expanded. 



1. Outer lip not extended beyond the apex; umbilicus narrow; spire depres- 

 sed; whorls 3 — 5, hyaline, without sculpture. L. to 5 mm. 



D. hyalina (Turton 1834) = debilis (Gould 1840). 

 Spire wart-like, prominent. L. 3 mm. 



var. spirata n. n. = debilis (Gould) in Pilsery 1893. 



2. Outer lip produced beyond the sunken apex; umbilicus rather wide; whorls 

 2 — 3 with very indistinct spiral keels. L. unto 4 mm. Shell hyaline with 

 yellowish cuticula D. glacialis n. sp. 



PI. 1 tigs. 1— 5. 



B. Length a little larger than breadth; columella bent to the right and the 

 aperture obliquely expanded below; spire depressed; whorls 3 — 4, the penulti- 

 mate projecting a little; umbilicus narrow. L. 6 mm. Shell hyaline 



D. exspansa (Jeffreys 1864). 

 II. Apex perforated, broadly rounded; outer lip produced above the apex. 

 A. Shell without sculpture; outer lip rounded at the suture. 



1. Umbilicus distinct; outer lip flattened above the middle. L. 4 mm. Shell 

 vitreous D. globosa (Loven 1846). 



The diagnosis made with guidance id' the specimens Iron: Kara Sea. determined by Leche, 



