85 



covering the scaling of the disc is a character of very little 

 importance, as it is found very well developed also in several 

 species of Ophioglijpha. (That a naked skin covers the plates 

 of all Echinoderms, I need scarcely name). I quite agree with 

 Levinsen herein, but I must further add the rather curious 

 that in Ophiopleiira there is no thick skin at all, covering 

 the scaling. On the contrary the skin is very thin and delicate, 

 and quite translucent, as is easily seen by preparing it off the 

 disc ; it is by no means thicker than in our common Ophioglypha- 

 species or in Opliiocten sericeum., and is quite unable to con- 

 ceal the scaling; it is from the character of the scaling itself 

 that it looks, as if the disc Avere covered with that famous 

 thick skin. 



21. Ophiopholis aculeata (0. F. Müll.). 



Lütken: Additamenta. p. 60. — Bell: Op. cit. p. 125. — Grieg: Oph. 

 d. Arktis, p. 26i. 



Angmagsalik, 130 fathoms, 16 specimens. — Jan Mayen, 

 15 fath., 1 sp. 



22. Ophiopns arcticHs Ljungm. 

 Ophiaregma abgssartmi G. 0. Sars. 



Lj ungman : Ophiuroidea \iYentia hue usque cognita. Ofvers. K. Vetensk. 

 Ak. Forh. 1866. p. 309. — G. 0. Sars: Bidrag til Kundskaben om Dyrelivet 

 paa vore Havbanker. Forh. i Vidensk. Selsk. Christiania. 1872. p. 112. — 

 Th. Mortensen: Über Ophiopus arcticus Ljungm., eine Ophiure mit rudi- 

 mentären Bursæ. Zeitschr. f. wiss. Zool. 56. 1893. p. 506. — Grieg: Ophiu- 

 roidea; Norske Nordh. Exped. p. 17. — Grieg: Oph. d. Arktis, p. 266. 



Henry Land, 20 fathoms, 10 specimens. — Rathbom Island, 

 94 fath., 5 sp. — SE. off Sabine Island, 110 fath., 3 sp. — Kap 

 Brewster, 250 fath., 1 sp. — Kap Tobin, .57 fath., 1 sp. — Forsblad 

 Fjord, 90—50 fath., 2 sp. — Turner Sund. 120 fath., 2 sp. — 

 flurry Inlet, 50 fath., 2 specimens. 



23. Amphiura Simdevalli (Mr. Tr.). 

 Amphiura Holbølli Ltk. 



Lütken: Additamenta. p. 55. — Duncan & Sladen: Op. cit. p. 67. — 

 Grieg- Oph. d. Arktis, p. 265. 



Off Henry Land, 20 fathoms, 1 specimen. 



