KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 48. N:o ÅA, 
bo 
An 
1. 5.3 (Eisen & Stuxberg /r 1871). — Strömstad, 1 sp., J. 5.6 (Hanson !'/3 1890). 
Bohuslän, without definite locality, many sps., max. 1. 9.2 (B. Fries 1838); (Fig. 10). 
South and west "coast of Norway: Herföl, 16 fms, 6 sps, max. 1. 7.9 (Torell). 
— Christianiafjorden, 5 sps, max. 1. 10.4 (Asbjörnsen). — Dröbak, 5—38 fms, corals, 
many sps, max. 1. 10.6 (Lovén 1850); Fig. 9; many of these shells have a concave 
under side, due to their adherence to corals; D:o, 50 fms, 2 shs, max. 1. 6 (Lovén 
1850). — WSörfjorden, Hardanger, 45 ifms, stones, 4 sps, max. 1. 6.5 (Bovallius !'/, 
1880). — Stolsfjord, Farsund, 47 fms, clay, 1 sp., l. 8 (Bovallius 1880). — Färne- 
fjord, 20—100 fms, sand, clay, 1 sp., 1. 5.5 (v. Yhlen). — Hitterö, 20—30 fms, shells 
3 shs, max. 1. 9.4 (Öberg 1869). — Bergen, 10 shs, max. 1. 8.8 (Sars). — Grip and 
Kristiansund (LILLJEBoORG 1851) many shs, high or depressed, max. 1. 8; br. 6.3; 
NNrArand TT 755 bri:6a51 hl 28 (Mus:sUI=— Trondhjemsfjord;! 6 :sps,/max. 1. 14.4 
(Koren). — Norway, witkout definite locality, many sps, much varying: max. 1. 9.6; 
br. 83 h. 4; apex 2.5; another sp.: I 8; br. 6.6; h. 3; apex 1.2 (Diben). 
Northern Norway: Nordlanden, 4 sps, max. I. 8 (Nylander & Gadd). — Tromsö 
(Lilljeborg) many shs, max. 1. 6; br. 5; h. 1.8 (depressed and with curved inferior 
margin) (Mus. U.). — Kjosenfjord, 25—40 fms, clay (Goöés & Malmgren ””/10 1861) 
1 sh., 1. 9.1; br. 6.8; h. 6; apex 2.5. — Grötsund, 70—100 fms, clay, 7 sps, max. 1. 
9.2 (Goöéös & Malmgren); D:o, 4 fms, shells, 4 sps, with concave under side, max. Il. 
4.5. — Peisen, 5 sps, with a slightly curved under side, max. 1: 6.6 (Nylander & Gadd). 
Finmark without definite locality, 4 shs, max. 1. 9.7 (Lovén); Figs. 11—12. — Kvz&en- 
angen, 0—25 fms (Cleve) 3 sps, max. 1. 8:5 (Mus: U.). 
Iceland (ODHNER 1910). Maximal dimensions: Thistilfjord, 1. 6; br. 4.5; h. 2; 
Raufarhofn 1. 12; br. 9.8; h. 6.3; shell solid (Fig. 13); Iceland, without definite local- 
tvn sh 13; br. 11; h. 6:5; apex 3: 
Limits of formal variation: 
1. | 4—5 | 6—"7 | 8—92 | 10—11 | max. 14.4 (Trondhjemsfjord) 
Scandinavia ; br. | 2.6—4 4.2—6.5 | 5.8—7.5 | 7.4—9 | TG 
75 sps hp. | 1.3—2:41.:6=—3.4 | 2.2—4.9 | 3—5.8 | 4.5 
measured apex | 0.8—1.6 | 0 8—2.7 | 1.4—3.3 | 2—3.5 | 4 
Specimens with a curved inferior margin occur commonly together with the 
type on coral bottoms. They are not included in the above table. 
Variation of colour and sculpture: The red radiating stripes of the shell are 
seldom wanting (var. lactea JEFFREYS (1865) of an uniform white colour), but they 
become paler in older specimens. In the following var. spitzbergensis they are wholly 
absent. The shell is usually smooth, but faint radiating lines sometimes occur; they 
are particularly prominent in var. spitzbergensis. 
K. Sv. Vet. Akad. Handl. Band 48. N:o 1. 4 
