KUNGL. SV. VET. AKADEMIENS HANDLTNGAR. BAND 48. N:0 1. 



25 



1. 5.3 (Eisen & Stuxberg "^/V 1871). — Strömstad, 1 sp., ]. 5.5 (Hanson ^'"'/a 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. !.'■> (Torell). 

 — Christianiafjorden, 5 sps, max. ]. 10.4 (Asbjörnsen). — Dröbak, 5 — -8 fms, corals, 

 many sps, max. 1. lO.o (Loven 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 (Loven 

 1850). — Sörfjorden, Hardanger, 45 fms, stones, 4 sps, max. 1. 6.5 (Bovallius ^^/^ 

 1880). — Stolsfjord, Farsund, 47 fms, clay, 1 sp., 1. 8 (Bovalhus 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 (Oberg 1869). — Bergen, 10 shs, max. 1. 8.8 (Sars). — Grip and 

 Kristiansund (Lilljeborg 1851) many shs, high or depressed, max. 1. 8; br. 6.3; 

 h. 2 and 1. 7.5; br. 6.i; h. 2.8 (Mus. U.) — Trondhjemsfjord, 6 sps, max. 1. 14.4 

 (Koren). — Norway, without definite locaUty, many sps, much varying: max. 1. 9.6; 

 br. 8; h. 4; apex 2.5; another sp. : 1. 8; br. 6.6; h. 3; apex 1.2 (Düben). 



Northern Norway: Nordlanden, 4 sps, max. 1. 8 (Nylander & Gadd). — Tromsö 

 (Lilljeborg) manj^ shs, max. 1. 6; br. 5; h. 1.8 (depressed and with curved inferior 

 margin) (Mus. U.). — Kjosenfjord, 25 — 40 fms, clay (Goes & Malmgren ^"/k* 1861) 

 1 sh., 1. 9.1; br. 6.8; h. 6; apex 2.6. — Grötsund, 70—100 fms, clay, 7 sps, max. 1. 

 9.2 (Goes & Malmgren); D:o, 4 fms, shells, 4 sps, with concave under side, max. I. 

 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 (Loven); Figs. 11 — 12. — Kvsen- 

 angen, — 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- 

 ity, 1 sh., 1. 13; br. 11; h. 6.5; apex 3. 



Limits of formal variation: 





1. 



4- 



•5 



6 



-7 



8—9 



10- 



11 



max. 14.4 (Tiondlijenisfjord) 



Scandinavia ; 



br. 



2.6- 



4 



42 



-6.5 



5.8—7.5 



7.4" 



-9 



11,1 



75 sps 



]i. 



1.3- 



2.4 



1.6 



-3.4 



2.2—4.9 



3- 



-5.8 



4.5 



nieasined 



apex 



0.8- 



-l.G 



08 



-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. Hand). Band 48. N:o 1. 4 



