r 



24 N. ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. VI. PROSOBRANCHIA. 2 SEMIPROBOSCIDIFERA. 



Natica bathybii Friele 1879 



(incl. var. oblonga Friele 1886). 



Pl. 3, Figs. 4, 18; Pl. 5, Fig. 15. 



Hal) i tat : 



Norwegian North-iVtlantic Expedition St. 251, 1159 m, 1 sp. (original), h. 8.2; 

 ap. h. 6.1; br. 7.4; ap. br. 4.i; umb. 2.2; sut. 2.2; wh. 5 (Fig. 18). — East Greenland (Swed. 

 Polar Exp. 1900), placed by Hägg 1905 among N. claiisa: S. E. of Pendiilum Island, 

 74° 35' N. 18° 15' W., 150 m, niud, stones (Vs), 3 sps and 2 shs, var. oblonga, max. h. 

 (sh. ) I6.4; ap. h. 10.2; br. 14; ap. br. 8; umb. 3.5; sut. 5.4; wh. 5 (Fig. 4); an other sh., 

 11. 15.8; ap. h. IO.7; br. 14.3; ap. br. 8.4; umb. 4.2; sut. 5; wh. 5, radula Pl. 5, Fig. löfrom 

 a specimen of h. 12.5; the smalle.st sp., h. 7.2; ap. h. 5.7; br. 7; ap. br. 4.2; umb. 2.2; sut. 2; 

 wh. 4V2. — Between Greenland and Jan Mayen, 72° 42' N. 14° 49' W., 2000 m, mud, 

 Foraminifera ("/«), 1 sh., var. oblonga, h. 14.G; ap. h. IO.2; br. 13.i; ap. br. 7.4; umb. 3.8; 

 sut. 4.5; wh. 5. — The shells are very thin and fragile, of a semi-transparent whitecolour, 

 with a very thin yellowish cuticula; spiral lines indistinctly marked, waved, of irregular 

 strength. Operculum thin biit distinctly calcareous, yellowish white, semi-transparent, 

 with a dark brown nucleus; by that and by its open umbilical fissure it is distinctly sep- 

 arated from N. clausa, biit it resembles deep forms of that species and from such it has 

 probably originated (cfr N. clausa). The animal is yellowish white, but the kidney, the 

 intestine and the liver are grayish brown, transparent through the shell. The radula 

 (Pl. 5 Fig. 15) resembles that of N. clausa, but the side denticles of the median tooth are 

 very small; the breadth of the radula is about O.45 mm in a specimen of 12.5 mm in lieight. 



General Distribution: 



North Atlantic (Iceland — Spitzbergen), Norwegian N. Atlantic Exp. St. 51, 240, 

 251, 303, 312 and 353; 634—1333 fms (Friele 1879, 1886; Friele & Grieg 1901). — N. of 

 Faroes, 64° 53' N. 10° W., 600 m (Friele 1902). , , 



Lunatia nitida (Donovan 1800) 



= Natica pulchella Risso 1826 = N. intermedia Piiilippi 1836 =N. Akleri Foebes 1838. 



Pl. 4, Fig. 21; Pl. n, Fig. 20. 



Hahitat: 



West coast of Sweden: Kullen (Lilljeborg 1852^'), max. h. 4.5 (Mus. U.). — 

 Laholmsbukten, 13 fms, clay, shells (Gunhild Exp. 1878), 2 shs, worn, max. h. 9.3; D:o, 

 10 — 12 fms, clay with sand (Gunhild Exp. 'Vj 1878), 1 sh. of a fresli appearance, h. 8; 

 ap. h. 6.'?; br. 7; ap. br. 3.8; umb. 3.r,; sut. l.r.; wh. about 4; Hallands Väderö — Höghalla 

 Point, 15 fms, shells (Lönnberg '"/j 1902), 4 sps, max. h. 11. 2; ap. h. 9.3; br. lO.fi; ap. br. 



