256 Th. Mortensen. 



Ctenodiscus corniculatas Duncan & Sladen. 1881. Memoir on the 



Echinodermata of the Arctic Sea. p. 49. PI. III. 

 Figs. 17—20. 



— krausei Ludwig. 1886. Echinodermen des Berings- 



meeres. Zool. Jahrb. Abt. f. Syst. I. p. 290. 

 PI. VI. Figs. 13—16. 



— crispalus Levinsen. 1886. Kara-Havets Echinoder- 



mata. p. 401. 



— — Döderlein. 1900. Zoologische Ergebnisse 



einer Untersuchungsfahrt des deutschen See- 

 fischei-Vereins nach der Bäreninsel und West- 

 spitzbergen, ausgef. im Sommer 1898. auf S. 

 M.S. "Olga". Die Echinodermen. Wiss. Meeres- 

 unters. N. F. IV. p. 221. Taf.IX. Fig. 2—3. 



— — Ludwig. 1900. Arktische Seesterne. Fauna 



Arctica. p. 450. 



— corniculaius Michailovskij. 1903. Echinod. Russ. Exp. 



Spitzbergen, p. 28. 



— crispatiis Ludwig. 1905. "Albatross" Asteroidea. Mem. 



Mus. Comp. Zool. XXXII. p. 104. PI. VI. 

 Figs. 32—33. 



— — M. Kali sehe wskij. 1907. Zur Kenntnis der 



Echinodermenfauna des Sibirischen Eismeeres. 

 Resultats scientifiques de l'Expedit. Polaire 

 Russe en 1900 — 1903, sous la direction du 

 Baron E. Toll. Zoologie. I. (Mém. Acad. Imp. 

 d. sei. de St. Petersb. 8. Sér. XVIII. Nr. 4. 

 . p. 24. Taf. I. Fig. 7— 8. II. Fig. 2— 4. 



— corniculatas Koehler. 1909. Échinodermes. Monaco. 



Fasc. XXXIV. p. 28. 



Stat. 98(77° N. 17 V3°W.) 300 m. 1 specimen. R. = 39 mm, r. = 18 mm. 



It is noteworthy that the paxillæ in this species are connected 

 at their bases by radiating muscles, very beautifully arranged (PI. XVI. 

 Fig. 5.). The spinelets of the paxillæ are invested in a thick skin, and 

 generally they are united in bundles of two or three, as is especially 

 seen very beautifully on staining the skin. The wall of the stomach 

 is full of small, irregular spicules (PI. XVI. Fig. 4). 



In one of the interradia I found on this specimen a cluster 

 of eggs, attached to one of the genital openings. The eggs are 

 rather large, 06 — 07 mm in diameter. The ovaries are seen to 

 contain eggs in all stages of development, from quite young to such 

 as are quite mature, ready to be laid. These facts make it very 



