KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 50. N:0 5. 49 



Lamellaria latens (Muller 1776) 



= L. teiitaculiita Montagu 1811, not Loven 1846. 

 Pl. 1, Fig. 6. 



Hjibitat: 



Norway, withoiit definite locality (Diiben), 2 sps, max. 1. sh. 8.2; br. 6.2; h. 3; col. 

 br. 1.4; wh. 2 '/4, c^; the other sh. 1. 3.4; br. 2.7; h. l.i; col. br. 0.6; wh. < 2, J*. — Bergen 

 (M. Särs), 2 shs, max. 1. 9.8; br. 7.5; h. 3.4; col. I.7; wh. 2 V, (l^ig- 6); D:o (Christie & Koren), 

 1 sp., 1. an. 12, 1. sh. 8.7; br. 6.5; h. 3; col. br. I.5, J". — Haugesund (Lilljeborg), 2 shs, 

 max. 1. 7.8; br. 5.5; h. 2.7; col. br. I..3; wh. 2 (Mus. U.). 



England: Cullercoats (Ålder), 3 sps, 2 cT, 1 ?; dimensions of one sh. (J"): 1. 6; 

 br. 4;h. 2.i; col. 0.8; wh. 2 +. 



Median vallie of the Formål Variation: 



1. of shell 4—5 6—7 8—9 j 9—10 



br. » > 3.1—3.8 , 4.6—5.3 6— fi.8 6.8—7.6 



h. » > 1.4— L8 I 2.1-2.0 2.9—3 2 3.1—35 



br. of noliimellrt . . . . 7—0.9 ' 1 — 1.2 ' 1.3—1.6 1.5—1.8 



Most of the specimens mentioned above are males, but among those from Cullercoats 

 one female is present, of the same depressed shape as the male specimens. Thiis no 

 sexual dimorphism exists in the present species, any more than in the preceding one. 



General Distribution : 



Norway: Bodö, Lofoten, W. Finmark, 20—50 fins (1. sh. 12, G. O. Särs 1878); 

 Solsvig, Bergen (Friele 1874; Bergh 1887); Kvsenangen, 20 — 30 fms (Aurivillius 1886); 

 Husö, 40—60 fms, and St. 173 b, 300 fms (Friele & Grieg 1901); Skatören, 30 fms, härd 

 bottom, rare (Sparre Schneider 1885). — British coasts, L. tentaculata (Forbes & Hanley 

 1853; Jeffreys 1867). — Faroe Islands, L. tentaculata (Mörch 1868). — France, L. tenta- 

 culata (Locard 1892). — Spain, Mediterranean, 8 — 20 fms, L. tentaculata (M' Andrew 

 1857). 



General Remarks on tlie Genus Lamellaria. 



The true nature of Montagu's L. tentaculata has hitherto been doubtfiil. LovÉisr 

 (1846) and Bergh (1886) give it as a distinct species coordinate with L. perspicua and 

 L. latens; Jeffreys (1867) includes it in L. perspicua, but Forbes & Hanley (1853) 

 consider it separate from this form. L. latens is not recorded by the English authors. 



Some of the specimens mentioned by Forbes & Hanley (1853, P. 359) from 

 Cullercoats were obtained by Loven and are preserved in the Swedish State Museum, 

 where I have examined them. Thoiigh the shells are almost decalcifiated, the cu- 



K. Sv. Vet Akad. Haiull. Band 50. X:0 5. 7 



