451 



70° 32' lat. N., 8° 10' long. W., ^Ve 1891, depth 470 fathoms; 

 Hekla-Havn '^Чэ 1892 (The Ryder-expedition 1891—92); Fors- 

 blad-Fjord •''^/s 1900, depth 50 — 90 fathoms; at Angmagsalik 

 ^^/9 1900, depth 140 fathoms (The Amdrup-expedition 1900). 



P. mammillaris 0. F. Müll. 



1806. Spongia mammillaris 0. F. Müller, Zool. Dan. IV, 44, Tab. CLVIII, 



Fig. 3-4. 

 1866. Polymastia mamm,illaris, Bowerbank, Mon. Brit. Spong. 11, 71, et ibid. 



1874, III, PI. XII, figs. 1-11. 

 1887. Polymastia penicilhis, Fristedt, Vega-Exp. vetensk. lakttag., IV, 434. 



Of this species we have only a very small specimen, only 

 measuring 4 mm in diameter, and with only one papilla; yet i 

 think the determination is sure. 



70° 32' lat. N., 8° 10' long. W., depth 470 fathoms (The 

 Ryder-expedition 1891 — 92); further it has been taken at the 

 East-coast of Greenland, depth 130 fathoms (The Swedish arctic 

 expdition 1883; Fristedt 1. c). 



Remarks: I am very inclined to think, that Spongia mam- 

 millaris of Müller is in reality identical with Rinalda uber- 

 rima Schmidt, as already noted by Levinsen (Dijmphna Togtets 

 zool. bot. Udbytte, 346), but as we have only the figure to judge 

 from, and as we can therefore only speak of probability but 

 not of certainty, [ shall here make no alteration in the use of 

 the names. 



P. paupera Frstdt. 



1887. Polymastia paupera Fristedt, Vega-Exp. vetensk. lakttag. IV, 434, 

 PI. 24, fig. 21. 



I have seen a small fragment of the type of this species, 

 but I am not able from this to say anything certain about it. 



East-coast of Greenland, depth 130 fathoms (The Swedish 

 arctic expedition 1883; Fristedt 1. c). 



Trichostemma Sars. 



T. hemisphaericum Sars. 



1872. Trichostemma hemisfhœricum Sars, On some remark, forms of animal 



life, I, 62, PI. VI, figs. 1-15. 

 1887.? Badiella spinularia Fristedt, Vega-Exp. vetensk. lakttag. IV, 435. 



