KtJNGL. SV. VET. AKADEMIEKS HANDLINGAR. BAND 50. NIO 5- 67 



Velutina plicatilis (Muller 1776) 



= v. flexilis (MoNTAGU 1808) = V. cryptospira Middexdorff 185L 

 PL 1, Figs. 12— IG; TI. 5, Figs. 25— 2G. 



Hal) i tat: 



West coast of Sweden: Gullmarn (Loven), 4 sps, max. 1. 14.4; br. lU; li. 6._'; ap. 1. 

 11.2; ap. br. 8; wh. 2; spire somewhat projecting (Pl. 1, Fig. 12, lett; PI. 5, Fig. 25); an 

 other sp. 1, IO.3; br. 7. c; h. 4.(i; ap. 1. S.c.; ap. br. IO.3; wh. aboiit 2; outer lip projecting 

 beyond tlie spire, wliich is somewhat sunken (V. cryptospira; Fig. 12, right); D:o (Zool. 

 St. 1886—1888), 4 sps, max. 1. 13.2; br. 9; h. 5.8; ap. 1. lO.s; wh. 2 +; D:o, Kristineberg 

 (Aurivilhus), 1 sp., 1. 11. s; br. 8.2; h. 4.8 (forma cryptospira) and 2 sps, max. 1. 12..-,; br. 

 8.9; h. 6 (forma typica); D:o, Flatholmsrännan (Loven; Aurivilhus ^|^ 1890), 4 sps, max. 1. 

 12.3; br. 8; h. 5.5; D:o, Skar (Loven), 3 sps, max. L 9; br. 6.7; h. 4.2 (aperture broadly 

 rounded, outer lip regularly arcuated, not projecting beyond the apex). — Väderöarna, 

 30 fms, rocks, 1 sp., 1. II.4; br. 8; h. 5; D:o (Zool. St. 1882), 1 sh., I. 12.2; br. 9; h. 5 (for- 

 ma cryptospira). 



Norway: Bodybet, 60 — 70 fms, sand (v. Yhlen), 1 sh., 1. 8.4; br. 6.2; h. S.ii; ap. I. 

 7.8; wh. 1 y.. — Finmark (Loven), 1 sh., 1. 8; br. 5. o; h. 3.4; ap. 1. 6.3; wh. 2 (Fig. 13). 



Wbite Sea: Solowetskij Island (Wagner), 1 sp., ]. 9.5; br. 7; h. 4.2; ap. ]. 7.s; wh. 

 2; cuticula grayish, soft and thick, almost smootli (Fig. 14). 



Spitzbergen: Horn Sound, 40 — 60 fms (Torell), 1 sh., 1. 15.5; br. IO.5; h. 6.7; ap. 

 1. 13; spire löst, — Bel Sound, 30 — 35 fms, stones, zoophji^es (Torell), 2 sps, max. 1. 

 13.3; br. 9; h. 6; ap. 1. IO.5; wh. 2 + ; cuticula grayish, gelatinous, appearing in transverse 

 stripes (Fig. 15). — Shoal Point, 30 fms, clay ('V, 1861), 1 sh., 1. 11. 5; br. 9; h. 5; spire 

 löst; cuticula gelatinous, in narrow transverse folds, resembling V. Schneideri. 



Behring Sea (Aurivillius 1886): Vega St. 1064, St. Lawrence Island, 1 — 4 fms, 

 stones (-% 1879), 1 sh., 1. 15.7; br. 12; h. 6.c.; ap. 1. 12.7; ap. br. 11; wh. 2 (Fig. 16). 

 Cuticula thick, brown, for the most part irregularly rugulated, towards the lower (left) 

 margin with distinct, though discontinuous ridges, thus forming a sculptural transition to 

 V. velutina. It differs from this species by the absence of a calcareous layer lining the 

 shell, wliich is developed in the first whorl only, — Vega St. 1006, 1 sh. (= V. haliotoi- 

 dea of Aurivillius 1886), 1. 17.7; br, 12; h. 7.3; ap. 1, 14.5; wh. 1 V2 — 1 ^U; the first whorl 

 calcareous and a very thin calcareous layer in the outer whorl towards the aperture mar- 

 gin; columella strongly sinuous; cuticula with sliarp distant ridges, obsolete in a portion 

 nearest the aperture; shell in most respects like V. velutina but with fewer whorls and a 

 much thinner calcareous layer (cfr V. velutina Vega St. 1016). — 2 miles N. of Vega's 

 winter harbour, 12 fms, sand (Vega St. 1016 -7, 1879), 1 sp., 1. I8.2; br. 13.3; h. 8.1; 

 ap. 1. 17,5; ap. br. 13; wh. 1 ^4; calcareous layer only in the first whorl and an extremely 

 thin calcareous lining in the aperture; cuticula wavy owing to strong, narrow, somewhat 

 irregularly placed spiral ridges, not at equal distances as in the preceding shell. 



Variation oj the shell. From the measurements and the statements given above it 



