Report on the Echinoderms of North-East Greenland. 261 



Ludwige has suggested that the Pteraster aporus described by 

 him in his paper: Echinodermen d. Beringsmeeres. p. 293 may prove 

 to be identical with Pt. militaris. I think he is right in this sug- 

 gestion ; the lacking of the oscular pore is probably only the result 

 of the preservation, and in the other characters given in the descrip- 

 tion there do not seem to be any differences of importance from 

 militaris. 



9. Pteraster pulvillus M. Sars. 

 Pi. XIV. Fig. 3. PI. XVr. Fig. 3. 



Pteraster pulvillus Sars. 1861. Norges Echinodermer. p. 62. Tab. VI. 

 (Pro parte). 

 — Döderlein. 1900. "01ga"-Echinodermen. p. 217. 

 Taf. VIII. Fig. 10—10 a. 



— — Ludwig. 1900. Arktische Seesterne. Fauna Arc- 



tica. p. 470. 



— — Grieg. 1902. Nordlige Norges Echinodermer. p. 27. 



— — Mich a i lovs к i j. 1903. Echinod. Russ. Exped. 



Spitzbergen, p. 68. 



— — Sussbach u. Breckner. 1910. Seeigel, Seesterne 



u. Schlangensterne d. Nord- u. Ostsee, p. 227. 



Stat. 71. Cap Bismarck, 15 — 20 m. 1 specimen. 



Besides the difference in the number of spinelets of the paxillæ 

 between this species and militaris pointed out by Sars in his 

 description of these two species it may be worth mentioning that 

 also the shape of these spinelets differs very considerably. While in 

 militaris they are simple fenestrated rods, scarcely widened at the 

 point, they are in pulvillus much widened in the point, almost 

 bush-shaped (PI. XVI. Figs. 2 and 3). These spinelets are very fragile, 

 so that it may be difficult enough to obtain one with the point 

 undamaged; this holds good of both species. 



The "sphæridiæ" (PI. XIV. Fig. 3) are essentially like those of 

 Pt. militaris as described in my paper on the "Echinoderms from 

 East Greenland", only more slender and more smooth. 



10. Solaster glacialis Dan. Kor. 



Solaster glacialis Danielssen & Koren. 1884. Norske Nordh. Exp. 

 Asteroidea. p. 42. PI. VIII. Figs. 9—10. PI. IX. 

 Figs. 1—6. PI. XV. Fig. 1. 



— endeca Levinsen. 1886. Kara -Havets Echinodermata. 



p. 398. 



' Arktische Seesterne, p. 470. 



