KUNGT^. SV. VET. AKADEMIENS HANDLINGAR. BAND 48. N:0 1. 



23 



(--/lo 1861). — Ulfsfjord, 25 — 50 fms, 2 sps, max. 1. 6.6. — Grötsund, 4 fms, shells, 

 and ebb, many sps, highly varying: max. 1. 22.i; br. 16. i; h. 6.6; another sp. 1. 

 14,3; br. 11.3; h. 6.2; or 1. 16; br. 11.2; h. 5.5 (Fig. 6). — Finmark, without de- 

 finite locality, many sps, max. 1. 21.4 (Loven); D:o, 6 sps, max. 1. 25.8 (Sparre 

 Schneider). 



Murman coast and Kola Peninsula: Gawrilowo, 1 sp., 1. 23.3 (Herzenstein 1880). 

 — Waideguba, a few sps, max. 1. 13.6 (Sandeberg '"/s 1877). — Lumbowski, 20 fms, 

 10 sps, max. 1. 23.8 (S. 1877). — Ladigino, 13 sps, max. 1. 30.Ö (S. 1877). — 

 Orafjord, 100 fms, 4 sps, max. 1. 17.3 (S. Vo 1877). — Russian Lapland, Schuret- 

 skoja (Lilljeborg) 6 sps, max. 1. 12.4 (Mus. U.). 



Nova Zembla and Kara Sea (Leche 1878): max. 1. 23.7 (Cape Grebeni, living). 



? Spitzbergen: Bel Sound, 8—12 fms, 1 sh., 1. 14.5; br. 10.6; h. 5.8 (Fig. 4); 

 probably mistaken for Iceland. 



Iceland (Odhner 1910): Berufjord, max. 1. 28; Raufarhofn, max. 1. 12.2; Sigla- 

 fjord, max. 1. 24.2 (Figs. 2—3). 



Greenland (Posselt & Jensen 1899): some measurements: Norsovak, max. 1. 

 18.8; Nivakfjord, max. 1. 28.8 (Fig. 7); Egedesminde, max. 1. 23.2; Ritenbenk max. 1. 

 23.2; Godhavn, max. 1. 25; Claushavn max. 1, 19.3; Sukkertoppen, max. 1. 24.8 

 (Fig. 5); Godthaab, 1. 8; Omenak, max. 1. 23.5. — Further: Proven, 20 — 40 fms, 

 rocks, 1 sp,, 2 shs, max. 1. (sh.) 20.2. ■ — Cape Dudley Digges, 30 — 40 m, mud, 1 sh., 

 1. 26.1 (E. Nilson Vt 1894). — 64°56' N. 66°18' W., 15-30 m, sand, 1 sp., 1. 12 (E. 

 Nilson ''-'Vxo 1894). 



Behring Sea: St. Lawrence Island, 1—4 fms, sand, 10 sps, max. 1. 21; br. 16; 

 h. 5.8; apex 6.6 (Vega Exp. ^/s 1879; Aurivillius 1887). 



Limits of formal variation : 



Scandinavia, 



' l. 



10—12 



14—16 



18—20 



22 24 



26—28 



max. 25.8 (Finmark) 



30-6; 



30.4 (Kola) 



Murman coast, 



br. 



6.8—9.8 



9.6—12.8 



12.7—16 



15.8—19 



19.5—21.5 



19 



22.7; 



22.9^ 



Kola; 65 sps 



h. 



2.6-5.4 



3-6.6 



5—8 



6.4—10.5 



8.2—11.5 



8 



13; 



14.4 



measured 



apex^ 



2.2—4 



3.4—4.4 



4—6.4 



4.4—9.2 



8—10 



8 



8.5; 



10.2 





1. 



10—12 



14—16 



18—20 



22—24 



26—28 



max. 28 (Berufjor<l) 







Iceland; 



br. 



7.3—9 2 



102— 12 2 



13—15 8 



16—18 4 



18.2—20 



20 







15 sps 



h. 



3.4—4.4 



5-6 



0—7.8 



8—9.5 



8.8—11 



11 







measured 



apex 



2.3—3.2 



3 8—5 3 



5-7.5 



7—8 



8.2—8.8 



8.8 









1. 



10—12 



14—16 



18—20 



22—24 



26—28 



28.8 (Nivakfjord) 





Greenland; 



br. 



7^9.2 



10—12.4 



12.2—162 



16.3—19.5 



18.8—23.2 



22.5 







35 sps 



li. 



3—4.4 



4.4—6.2 



5.2—7.8 



6.2—10 



8.2—11 



10 







measured 



apex 



3—3.8 



3.7— 5..5 



5.2—7.6 



7—9.6 



9.2—11.8 



12 







Colour variations: forma tesselata .Müller 1776: colour marbled with brown 

 and white (typical); atropurpurea Loven 1846: colour dark purplish, Bohuslän; alba 

 LovEN 1846, lactea Jeffreys 1865: colour white, Bohuslän, Denmark, England; pallida 

 Verkrüzen 1872: colour white to reddish brown » without the longitudinal rays of the 

 typical species», Iceland. 



^ Perpendicular distance from apex to anterior margin. 



