314 DISCOVERY REPORTS 



radial side of the bursal slits proved to be female ; quite possibly male gonads may be 

 situated adradially to the genital slits, on the dorsal side of the arm (as is the case for 

 example in Ophionotus hexactis), but this must be left undecided. 



It appears very probable that the development is intra-ovarial, as in Ophionotus 

 hexactis. The gonads contain a considerable number of small eggs, besides one or two 

 of larger size. It is thus very probable that only these large eggs develop into embryos, 

 the other eggs serving as food for the embryo, as is the case in O. hexactis. One of the 

 gonads from the interradius which I opened is considerably swollen, there being a large 

 empty space with no eggs on the wall, and the small eggs in the basal part of the gonad 

 apparently somewhat reduced in size. Unfortunately the large egg (or embryo) within 

 this gonad is in an exceedingly poor state of preservation ; but I can scarcely have any 

 doubt that we have here a case similar to that which occurs in Ophionotus hexactis. 



It is worth mentioning that the young ones have no regular rosette of primary disk 

 plates. 



The genus Ophiomages is evidently closely related to Ophiosteira; indeed, I rather 

 think it ought to be united with that genus, which would then comprise the two species : 

 antarctica, Bell, and cristatus (Koehler). (As for O. Senouqui, cf. below, p. 315.) 



Ophiosteira Senouqui, Koehler 



} Ophioglypha carinifera, Koehler, 1901. Result. Voyage 'Belgica'. Echinides et Ophiures, 



p. 14, pi. i, figs. 3-5. 

 Ophiosteira Senouqui, Koehler, 1912. IP Exped. Antarct. Fran^aise. Echinodermes, p. no, 



pi. X, figs. 8-1 1. 

 O. Senouqui, Koehler, 1922. Austral. Antarct. Exped. Echinod. Ophiuroidea, p. 46, pi. Ixxxvii, 



figs. 1-5. 

 O. Senouqui, Hertz, 1926. Deutsche Siidpolar-Exped. Ophiuroiden, p. 24, Taf. v, figs. 1-3, 7. 



St. 170. 23. ii. 27. Off Cape Bowles, Clarence Island, 342 m. 2 specimens. 



St. 175. 2. iii. 27. Bransfield Strait, South Shetlands, 200 m. 2 specimens. 



St. 187. 18. iii. 27. Neumayr Channel, Palmer Archipelago, 259-354 m. ' specimen. 



St. 190. 24. iii. 27. Bismarck Strait, Palmer Archipelago, 93-130 m. i specimen. 



St. 599. 17. i. 31. 67° 08' S, 69° 06' W, Graham Land, 203 m. 2 specimens. 



St. WS 94. 16. iv. 27. 50° 00' S, 64° 58' W, 1 10-126 m. I specimen. 



St. WS 97. 18. iv. 27. 49° 00' S, 61° 58' W, 145-146 m. I specimen. 



St. WS 212. 30. V. 28. 49° 22' S, 60° 10' W, 242-249 m. I specimen. 



St. WS 245. 18. vii. 28. 52° 36' S, 63° 40' W, 304-290 m. 3 specimens. 



St. WS871. I. iv. 32. 53° 16' S, 64° 12' W, 336-341 m. I specimen. 



It is evident that Ophiosteira Senouqui is at least very closely related to, if not identical 

 with, the species described by Koehler in his report on the ' Belgica ' Echinoderms under 

 the name Ophioglvpha carinifera, and I can only wonder that Koehler in describing 

 O. Senouqui did not make any reference to carinifera. Judging from the description of 

 carinifera the only difference from Senouqui is the existence of granules between the 

 plates of the disk. Koehler's figures show these granules very distinctly, and having 

 recently had an opportunity of seeing the type specimen in the Brussels Museum I can 

 testify to the correctness of Koehler's figures in this regard. The description states that 



