296 '"• " Os 1 KM Kr. I). 



samples Ironi llu" pack-ice in Auj^usl VM)^^ and disappeared together 

 Nvilh il wlu'ii rcachiiii; llic coaslal walcr, hut more slowly (the 

 empty houses are perhaps more persistent than those ol" var. lypica). 

 It was present together with var. ti/pica in Aug.- Sept. 1907 in Dan- 

 marks Havn, hut not common. In 1908 (July— August) it was not 

 present in the coastal water, but appeared in the pack-ice (probably 

 only empty houses) and became common in the samples from the 

 outer margin of and outside the ice. 



Dimensions (in a) : ;}25 x 80, 420 x 80. 



Dislril). {ol' C. ({cnliciilal(i): Ncrilic northern species of wide (listril)u- 

 tion, known alonjf the coasts I'roni New l-'oundhind norlli- and eastwards to 

 tlu' IJaltic- Sea. 



Ptychocylis Brandt, 1886. 



5. Ptychocylis obtusa Brandt, 1896, p. 59, pi. 3, figs. 13, 15; 

 1906 — 07, p. 310, pi. 57, fig. 8; P. iinmla, var. obtusa Jørgensen, 1901, 

 p. 18, pi. 3, fig. 32; P. Drygalskiji Brandt, 1896, p. 59, pi. 3, fig. 14; 

 P. obtusa, var. Dnjgalskyi Bdt., 1906-07, p. 312, pi. 55, figs. 1-3; pi. 

 56, figs. 3, 4; pi. 57, fig. 10; P. urnula var. digitalis, Jørgensen 1901, 

 p. 17, pi. 2, figs. 29, 30, pi. 3, fig. 31; 1905, p. 143. (Fig. 6). 



In samples from Danmarks Havn, Aug.— Septm. 1907, P. obtusa 

 was found in some numbers, but not common; further it was pre- 

 sent in July 1908 in some 

 samples from the coastal 

 water and here not so un- 

 common. It was with some 

 hesitation that I named all 

 the specimens examined 

 P. obtusa, as at least the 

 smaller ones also may be 



named var. Drygalskyi, but 

 Fig. 6. Ptychocylis obtusa Brandt. 2.')0 t. m. . . . 



it has been impossible to 



me to find any distinct boundary between the main species and the 



so-called variety. To me it seems, as if var. Drygalskyi is only the 



smaller individuals oî P. obtusa; and the annexed sketchs will show 



my meaning. Therefore I name them all P. obtusa. 



1)1 strit). Arctic neritic species known from Davis Strait, Labrador 

 Stream, Norwegian Sea, Norway, Spitstjergen. 



6. Ptychocylis urnula (Clap. & Lachm.) Bdt., var. acuta Brandt, 

 1906, p. 28, pi. 56, figs. 1, 2, 6; pi. 57, fig. 7; P. acuta Brandt, 1896, 

 p. 59, pi. 3, fig. 16. 



In two samples from the outer part of the pack-ice in August 

 1906 a few specimens of a Ptychocylis were observed which I refer 



