II. 
110 
KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 48. N:o 1. 11 
Uniformly cream-coloured; radiating lines distinct. L. 10—11 mm 
var. spitzbergensis n. var. 
1: 0 161: CRS 
2. Shell of a uniform reddish, brownish or yellowish colour, without radiat- 
ing sculpture. L. 4—8 mm A. rubella (FABRICIUS 1780). 
Pl, 1 figs. 16—23. 
Shell elevated conic with concave under side var. elevata ODHNER 1910. 
Pl. 1 fig. 23. 
Radula with a rudimentary uncinus on each side, at least in certain segments: 
I 32:31:01.) 2. 1; all teeth pointed (subg. Collisella DArrL 1871). 
A. 
Second lateral tooth elongated conical, about 4 times the third in length, 
slowly tapering towards the apex. Shell smooth or with fine radiating striz, 
apex directed foreward, hind slope slightly convex; colour: white and brown 
stripes of about equal breadth; inside bluish with a well defined brown 
centre and a broad white-striped brown marginal band. LL. 24—34 mm 
A. patina EscHscHoLtTzZ 1833. 
BIS Tree 
Second lateral tooth about 2 times the third, from a quadrangular base 
abruptly tapering towards the apex. Shell smooth or with strong radiating 
ridges; apex directed foreward, hind slope highly convex; colour: irregular 
brown and white stripes and minute white and black dots; inside with an 
undefined brown centre (or spots), a bluish or whitish lateral partition and 
a dark marginal zone often with irregular white and brown dots. L. 11—25 
mm ÅA. persona ESCHSCHOLTZ 1833. 
Second lateral tooth nearly as long as the third, triangular, thus immediately 
from the base-line tapering towards the pointed apex. Shell conic with 
coarse radiating ridges, often obsolete, hind slope nearly straight; colour: 
brown stripes broader than the white ones; inside cream coloured with 
an irregularly brown-spotted centre and a narrow discontinuous marginal 
band of brown dots. L. 30—40 mm A. pelta ESCHSCHOLTZ 1833. 
BYTE SSwPRG6rie 2 
Fam. Patellidz2. 
Radula 3.1.(2.0.2).1.3; branchie in a complete circle; shell solid with the 
apex nearly central Patella LINNÉ 1758. 
RBadula of the same formula; branchial circle interrupted in front; shell thin, 
with the apex anterior Helcion MONTFORT 1810. 
Patella LiInnéÉ 1758. 
Surface of the shell with radiating ribs (sometimes obsolete) and strie. Colour 
varying: white, yellow, red, greenish or blackish. &L. 35—58 mm 
P. vulgata LINNÉ 1758. 
Pl, 1 figs. 24—96, 
