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



57 



1 sh., 1. 12,2; br. 10; h. 5; ap. 1. 12; ap. br, 9.6; col. br. O.o; wh. 2 +, cuticula thin with 

 minute deiise spiral lines. — Cape Dudley Digges, 30 — 45 m, miid (E, Nilson 7; 1894), 

 1 sp., 1. 27; br. 22; h. 11. 5; ap. 1. 25.3; ap. br. 20.9; col. br. 2.8; wli. 2 ^U, cuticula thin but 

 distinct, furnislied with extremely fine regular spiral elevated lines (Fig. 1). — 72° 8' 

 N. 74° 20' W., 30—80 m, härd mud (E. Nilson "/<, 1894), 5 sps, max. 1. 15; br. 13; h. 

 6.4; cuticula thin, almost velvety with extremely fine lirse (Pl. 5, Fig. 27). 



Note on synonymy. The description as well as the figure given by Brown (1838) 

 pro ve very clearly that his type was the expanded form of the species (= var. expansa 

 G. O. Särs 1878). Gould & Binney (1870) mark the following as a distinguishing char- 

 acter of Brown's shell as compared ^vdth Gould's Velutina zonata (P. 336): »the 

 greater breadth and excavation of the flattened lip and a more irregular exteriör», but 

 they mention nothing about the expansion of the lip, which was complete in Brown's 

 shell, according to his words: »spiral exceedingly small, placed laterally and sunk behind 

 the expansion of the outer lip». Gould's specimen, however, judging from his figure, 

 has a smaller aperture. Apparently by reason of Gould's (& Binney's) identification. 

 Särs (1878) has retained Brown's name for the more contracted form and created a 

 new variety for the expanded one. Though the forma typica of Särs seems to have a 

 somewhat smaller aperture, I consider it, in accordance with Särs, identical with var. 

 zonata Gould. 



Limits of Formål Variation. Spitzhergen, 50 sps measured. 



length of shell . . 

 breadth » » . . 

 height ' . . 



length » aperture 

 breadth » » 



> >> columella 

 whorls 



9—10 



6.8—8.5 

 3.6—4.7 

 7.9—9.9 

 6.5—8.4 

 0..5— 1.3 



12—13 

 9—11 



4.7—6.4 



10 6—12.8 



8.7— 10 8 



0.5—1.9 



2+ 



15- 

 11.2- 



6- 



13.3- 



10.7- 



0.5- 



-16 

 -13.7 

 -7.9 

 -15.4 



-13 



-2.4 



2'/. 



18- 



-19 



13.7- 



-16 



7.1- 



-9.5 



158- 



-18.2 



12.8- 



-15.6 



1- 



-2.8 



2V3- 



-2'/. 



21—22 



15.7—18 



8.3—11 



18.4—21 



15.7—17.8 



1.2—3.2 

 about 2 1/2 



max. 23 (Cross Bay) 

 18.5 

 11.5 

 22.5 

 17 

 1.6 

 2 '/ 



The forms from Finmark differ from those from Spitzbergen in their higher num- 

 ber of whorls in specimens of the same size, as is evident from the following table: 



Finmark 



1. 6.1; br. 4.8; h. 2.7; ap. 1. 5..-); ap. br. 4.6 



» 9.5; y 7.7; » 4 ; » » 8.4; » » 6.5 



» 11 ; » 8 ; 4.9; » » 9.7; » » 7.8 



wh. 



- 'M Fi 

 » 2 7 J 



Figs. 2, 3 



Spitzhergen 



1. 6.1; br. 4.7; li. 2.6; ap. 1. 5.3; ap. br. 4.8; u-h. 1 Vj (Red Bay) 

 >> 9.3; » 7.3; » 4.3; » • 8.6; ' • 7 ; » 2 1 



11.6; 



8.9; ' 5 ; 



» 10.4: 



8.6; 



2+ I 



Bel Sound 



In the Norwegian specimens the innermost part of the whorls is smaller than that 

 of shells from Spitzbergen. In the last-named district shells of 2 V2 whorls have a length 



K. Sv. Vet. Akad. Handl. Bd 50. N:o 5. 



