KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 50. N:0 5. 55 



The greater part of the vagina, as well as the biirsa copulatrix and tlie prostata 

 conseqiiently belong to the hermaphrodite portion of the genital apparatus. The highly 

 distal position of the inner mouth of the vas deferens must be regarded as a primitive 

 character. The corresponding position of the end of ductus hermaphrodisiacus as well 

 as the rudimentary oviduct may be regarded either as secondary or as primitive pheno- 

 mena, according as the supposition is accepted that Marsenina originates from Lamellaria 

 and allied forms, or the reverse. These are questions which at present must be left 

 unanswered. 



Velutina undata Browx 1838 

 incl. var. zonata GouLD 1841. 



Pl. 2, Figs. 1 — 10; 15; TI. 5, Figs. 27, 28. 



Habitat:' 



Norway, without definite locality (Diiben), 2 slis, max. 1. 6.r>; br. 5; h. 2.8; ap, 1. 

 5.7; ap. br. 4; \vh. 2 '4, var. zonata. — Finmark (Sparre Schneider), 8 sps, max. 1. 11; 

 br.'8; h, 4.9; ap. 1. 9.7; ap. br. 7.8; col. br. O.s; wh. 2V2 (Figs. 2, 3, left); another sh. 1. 9.5; 

 br. 7.7; h. 4; ap. 1. 8.4; ap. br. 6.5; wh. 2 V4 (Figs. 2, 3, right), var. zonata. 



Norway—Beeren Island, 73° 3' N. 18° 30' E., 410 m, bott. temp. + 2°, grayish 

 clay (% 1898), 4 sps, max. 1. 13; br. 9.8; h. 5.5; ap. 1. 12.3; ap. br, IO.4; col. br. O.o; wh. 

 2 V^; cuticula distinct, with close, elevated spiral lines (Fig. 4). — Beeren Island (July 

 1868), 1 sh., 1. 9.3; br. 7.3; h. 4; ap. 1. 9; ap. br. 7; col. br. I.3; wh. 2. 



White Sea, Soiowetskij Island, algae (Rimskij-Korsakow -"/o 1895), 1 sp., var. 

 expansa, 1. II; br. 10; h. 5; ap. 1. IO.2; ap. br. 9; col. br. I.2; wh. 2 Vo cuticula inconspi- 

 cuous; spiral hnes distinct, elevated. 



Nova Zembla and Kära Sea (Leche 1878). Measurements: Kära Sea, St. 152: 

 I sp., 1. 16; br. 13; h. 7.5; ap. br. 12.8; col. br. 2.8; wh. 2 +. — Cape Grebeni, St. 127, 

 1 sh., 1. about 6, fragmentary. — Matotschkin Shar, Beluscha Bay, 10 — 15 fms (St. 10, 

 1876), 2 shs, max. 1. 8; br. 6.0; li. 3.4; ap. 1. 7; ap. br. 6.3; col. br. 1; wh. 2; D:o, 4 — 6 fms 

 (St. 4, 1876), 1 sh., 1. 13.4; br. 11. 2; h. 5.8; ap. 1. 12.i; ap. br. ll.i; col. br. Lo; wh. 2 'A; 

 D:o, 2 — 5 fms (St. 80), 2 sps, max. 1. 9.3; br. 7.5; h. 4; ap. 1. 8.8; ap. br. 7.2; col. br. 1; 

 wh. 2 +. 



North of Siberia (Aurivillius 1887). Measurements: Actinia Bay, St. 29, 1 sh., 

 1. 14.7; br. Il; h. 6.4; ap. 1. 12.5; ap. br. IO.5; col. br. 2.i; wh. 2 + (Fig. 9). — Cape Jakon, 

 St. 60, 4 shs, max. 1. 21.5; br. 17; h. 9.3; ap. 1. 19.3; ap. br. 16; col. br. I.4; wh. 2 ^4 (Fig. 

 8). — Further: St. 5, Jugor Shar, Chabarova, 5 — 8 fms, clay, sand (^V? 1878), 1 sh., 

 1. 5; br. 4.3; h. 2.2. — St. 1027, 2 miles N. of Vega's winter harbour, 10 — 14 fms, sand 

 (Vt 1879), 1 sp., 1. 17; br. 13.5; h. 7.8; ap. 1. 14.8; ap. br. 12.8; col. br. 2.3; wh. 2 V2. 



Beeren Island— Hope Island, 75° 49' N. 24° 25' E., 80 m, bottom temp. —1.42°, 

 rocks, 1 sp., together with V. velutina, 1. 9.i; br. 8; h 4; ap. 1. 9; ap. br. 7.7; col. br. O.o; 

 wh. 2; columella rather thick with minute but distinct spiral folds fringed in the edges. 



^ The measnrement of tlie aperture is licre as in all preoeding cases taken from the reflected columellar 

 margin across the moutb, so that the breadth of the columella is included. 



