22 AUGUSTA ÄRNBÄCK-CHRISTJE-LINDE, NORTHERN AND ARCTIC 1NVÉRTEBRATES. 



— Spb. Exp. 1864 (I. A. Malmgren): Stor Fjord: Whales Point, 20—30 fms, clay, 

 1 sp (August 9, 1864); Stor Fjord, 78° 31' N-19° E, 5—20 fms, clay and stones, 8 

 sps (August 23, 1864). Spb. Exp. 1872-1873: Bel Sound, 4-12 fms, clay, 10 

 sps (July 1872). — Spb. Exp. 1898: Bel Sound, Recherche Bay, 0—20 m, stones, 1 

 sp (July 13, 1898). 



General Distribution. 



Pelonaia corrugata occurs, though sparingly, along the whole Norwegian coast. 

 In the northern Norway it has been collected in Ramfjord, 45 m; Kjöllefjord, 50 — 60 

 m; off Tromsö; Vadsö, 12 — 55 m; on the west and south coasts: off Molde; in Har- 

 dangerfjord, 10—50 m (Grieg 1913); Arendal, about 24 m; in the mouth of Christi- 

 aniafjord at Bollaerene, 20—30 m (Särs 1866, Kiaer 1896, Bjerkan 1908). It has 

 also been dredged in Cattegat, in the North Sea, off the coasts of Denmark, Holland 

 and the British Isles, the Faroe Islands, Iceland, Greenland (Traustedt 1880). In the 

 Arctic Ocean this species is widely distributed; it is nearly circumpolar (Hartmeyer 

 1903, 1909; Redikorzew 1906). Moreover it has been reported from the American At- 

 lantic coast: Labrador, the Gulf of St. Lawrence, Massachusetts (Van Name 1912), 

 from the south-eastern Bering Sea (Ritter 1913), the western coast of Canada: 

 British Columbia, Rose Spit, 22 sps, in a few fathoms (Huntsman 1912). 



Remarks. 



The form of body of Pelonaia corrugata is usually elongated, flask-shaped, the 

 broader posterior part tapering into an obtuse point. The test is usually of a dark- 

 brown colour, coriaceous and transversally corrugated, covered with sand grains. In 

 no specimen well-developed attaching filaments have been observed. (Pl. 1, figs. 10 — 

 12.) In the collections examined there are, however, individuals of an other type, more 

 elongated and slender, almost worm-like; the test is thin, of a light-grey colour and 

 incrusted with very fine sand grains. They have been brought back from Finmarken, 

 Norway. No doubt they represent the form which has been described as a different 

 species under the name of P. glabra. There is also a small collection of specimens 

 from Jan May en which agree with the above-mentioned ones as to the form of the 

 body; they are quite black being incrusted with black grains, only a small area 

 around the apertures is white. As regards the internal structure the worm-like forms 

 do not differ in any essential points from that of the common type. The only no- 

 ticeable difference observed is that the gonads are small and very little developed. 

 I therefore agree to the view of Hartmeyer that specimens of that type are young 

 ones of the species corrugata. 



According to Van Name (1912, p. 546, text-fig. 29) the gonads of Pelonaia 

 corrugata are represented by one straight structure on each side. In all specimens 

 examined by me, even in young ones, the gonads are U-shaped. As far as I can 

 see, other authors agree in that respect. (Pl. I, fig. 13). 



The largest individual in the collection has been collected in Berufjord, Iceland, 



