10 O. NORDGÅRD [1922 



genetic hint to a phylogenetic interpretation. (See O. Abel 1916, 

 p. 162). 



Rossia glaiicopis Loven. 



Rossia glaucopis Loven, 1846, p. 3. 



— — G. O. Sårs, 1878, p. 337, pl. 32. 



LovÉN's original description vs^as based on a specimen from Fin- 

 mark. I have caught R. glaucopis at different times of the year and 

 at many localities in the Trondhjem region from Frøyf jord to Beit- 

 stadfjord in depths of ca. 50 to 350 m. In spite of its common oc- 

 currence in the Trondhjem Fjord it is probable that this species 

 should be considered as an arctic one. 



D i s t r i b u t i o n. — East Spitsbergen ( Krause, 1892, p. 372); 

 West Spitsbergen (Knipowitch, 1901, p. 104); Between Spitsbergen 

 and Bear Island and between Bear Island and Norway (Friele 

 and Grieg 1901, p. 124); Norwegian coast (G. O. Sårs 1878, p. 338); 

 Bohuslen (Lønnberg. 1891, p. 13); Shetland (R. papillifera Jef- 

 freys, 1869, p. 135); Off the south of Ireland (Massy, 1909, p. 20); 

 Jan Mayen (Becker, 1882—83, p. 81); Greenland (Posselt and Jen- 

 sen, 1898, p. 275); N. E. America, Nova Scotia to ca. 32° N. (R. sub- 

 levis Verrill, 1881, p. 356). — 



Eggs containing embryos of jR. glaucopis are drawn by G. O. Sårs 

 (1878, pl. 32). The eggs of glaucopis are a little smaller than those 

 of macrosoma with a greyish white colour, diam. 7 — 8 mm., or 

 8 — 9 mm. The egg-capsules of macrosoma I have always tåken on 

 hard bottom, hut the eggs of glaucopis are commonly found on 

 muddy bottom enclosed in soft sponges. In V. Storm's collection I 

 have seen such eggs from Hasselvik, Rissa, August 1883. Most of 

 the embryos had a great yolk-sack, hut some of them were on the 

 point of being hatched, one young was hatched, length of the 

 mantle 7 mm., length from end of body to the tip of the short arm.s 

 ca. 15 mm. 



On Va 1914 I took in Leangen at Trondhjem at a depth of 150 m., 

 muddy bottom, a soft sponge containing youngs and eggs of R. glau- 

 copis with pigmented embryos. In the hatched youngs length of 

 the mantle was 7 — 7.5 mm., and length from end of body to the tip 

 of short-arms 14 — 17 mm. Hence may be concluded that a young 

 caught 'Ve 1912 in Frøyfjord, ca. 100 m., with a length of mantle 

 10.5 mm., and length from end of body to the tip of short arms, ca. 

 22 mm., had been recently hatched. 



Eggs of R. glaucopis were tåken by the Norw. N. Atl. Exp. ^7? 

 1878 at a station between Bear Island and Norway, depth 408 m. 

 (Friele and Grieg, 1901, p. 124). In the summer 1889 Kukenthal 

 and Walther at East Spitsbergen collected both adults and eggs 

 of R. glaucopis (Krause, 1892, p. 372). According to Kukenthal's 

 communication to the Geogr. Soc. of Berlin (1890) the zoological 



