36 NILS ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. V. PROSOBRANCHIA. 1 D1ÜTÜCARDIA. 



80 — 100 fms, 3 shs, max. 1. 5.5; br. 4; h. 2.3; apex 0.7, grayish white, coarsely sculp- 

 tured; var. albula (Fig. 23). — Norway, without definite locality, many shs, max. 1. 

 9.3 (Düben). 



Limits of formal variation: 



Scandinavia; 1. 



3—4 



4 



-5 



5 



-6 



6 



-7 



7-8 



8 



-9 



9—10 



max. 9.5 (Väderöarna) 9.8Christia- 



50 sps br. 



(I.9)-2.9 



2.4 



-3.9 



3.1- 



-4.7 



4- 



-5.4 



5—6.4 



5.7- 



-7.4 



6.6— (8.2) 



7 7.5 niaijord 



measured h. 



(0.9)— 1.8 



1.3- 



-2.4 



1.5- 



-2.4 



1.7 



-2.7 



1.9—3 



2.4- 



-3.3 



2.4 -(3.3) 



2.7 2.3 



apex 



(0.7)-l 



0.6- 



-1.2 



0.7- 



-1.4 



0.8 



-1.7 



1.8—2 



1.5 



-2.4 



1.9-(2.7) 



2.1 2 



Numerals in a parenthesis are calculated. 



Structural variation: radiating riblets are always present, though more or less 

 conspicuous, especially prominent in specimens from Grötsund, Norway. — Colour 

 variation : from light yellowish to reddish or brownish ; specimens from Grötsund differ 

 from the typ by their uniform white colour (var. albula Jeffreys, Fig. 23). — Speci- 

 mens of unusual breadth are named by Jeffreys as var. expansa (Figs. 18, 19). 



General Distribution: 



Norway: Vadsö, southwards, 10—180 fms (Aurivillius 1888; 1. 9, G. O. Sars 

 1878; Norman 1902; Krause 1887); Varangerfjord, 20—124 m (De Guerne 1886); 

 western coast (Friele 1874; Metzger 1875, 0—35 fms; Nordgaard 1907). — Christiania- 

 fjord, 10 -140 fms (Asbjörnsen 1854: Jeffreys 1870). — Bohuslän, 20—70 fms 

 (Malm 1855); Göteborg Skärgärd, 23 fms (Malm 1858); Kullen (Lilljeborg 1855). — 

 Helleba^k, Denmark, 16 fms (Mörch 1871); Kattegatt (Petersen 1888). — North Sea 

 and Fair Isle Bank, to 286 m (Simpson 1910 + var. albula and expansa). N. of 

 Hebrides, 170 189 fms (Jeffreys 1869); Western coasts of British Isles, 10 — 100 fms 

 (Jeffreys 1865). — France, very rare (Locard 1892, 1899). — Azores, 1,000 fms 

 (Watson 1886). Depths to 1,000 fms. Rocks, sand, clay. 



Scissurella crispata Fleming 1832 

 (inch var. angulata Loven and var. aspera Philippi). 



PI. 2 figs. 26—27. 

 Habitat: 



Bohuslän: Väderöarna, 60 fms, corals (Loven) 2 shs, max. h. 1.8; aperture l.;;; 

 br. 2.5; wh. 3 ^4; Svinesund, 30—70 fms, mud with stones (Lindahl) 1 sh., h. 3.5; 

 aperture 2.4; br. 4.2, wh. 4'/2; var. angulata. — Norway; Dröbak, 60 fms, clay, sev- 

 eral shs (Loven 1850), max. li. 4:.-^; aperture 2.7; br. 5; wh. 4 * 4 (Fig. 27); Grip 

 (Lilljeborg) 1 fragm. ; var. angulata; Bergen, 70 fms, sand (Lilljeborg) type and var. 

 aspera; D:o, (M. Sars) 2 shs, h. 2.!; aperture l.o; br. 2.7; wh. 4; Fig. 25, var. aspera; 

 Finmark (Loven) 2 shs, max. h. l.a; aperture 1.3; br. 2.4 var. angulata (original). — 



