3i6 DISCOVERY REPORTS 



1917, p. 173) — really belong to that genus or rather to Ophiuroglypha. Koehler does 

 not mention the character of the spines ; but it seems not improbable that the two species 

 debitor and rotundata, with only three arm spines, will have the middle one transformed 

 into a hook, and thus will belong to Ophiuroglypha, whereas O. echimdata, with eight to 

 nine spines, is a true Ophiosteira — indeed, I think it identical with O. antarctica. Having 

 had an opportunity of examining the material of O. antarctica in the British Museum, 

 I find all possible transitions between specimens that have all the plates of the disk 

 perfectly smooth and those that have all the plates provided with a strong spine, the 

 character of O. echimdata. Sometimes only the central plate has such a spine, the other 

 plates being wholly smooth ; in other specimens the central plate is smooth, the other 

 plates having each a strong spine. Also in regard to the development of the radial keel 

 there are all transitions, from a low, rounded, sausage-like elevation to a high, sharp 

 edge. Neither can I discover any difference in the shape of the buccal shields — in short, 

 I cannot find a single character of any value distinguishing echimdata from antarctica, 

 and must, accordingly, regard echimdata as synonymous with antarctica. Thus in all 

 probability the latter remains the only species of the genus Ophiosteira — unless 

 Ophiomages cristatus, Koehler, is also a true Ophiosteira, which I think quite probable. 



Ophiosteira antarctica is viviparous and hermaphrodite . There are three to four male 

 gonads along the adradial side of the bursal slit, and one to two female gonads along 

 the interradial side. I have found two to five young ones in each bursa, all at very nearly 

 the same stage of development. 



The species O. Senouqin has separate sexes and is not viviparous. There are a number 



of gonads along both the adradial and the interradial side of the bursal slits. The eggs are 



small and very numerous, indicating the probable existence of a typical Ophiopluteus 



larva. The bursal walls are quite strong and contain a great number of fenestrated 



plates. 



Ophiuroglypha Lymani (Ljungman) 



(Plate VIII, fig. 3) 



Ophioglypha Lymani, Ljungman, 1870. Om tvdnne nya arter Ophiurider. Ofvers. K. Vetenskaps. 



Akad. Forhandl. Stockholm, 1870, p. 472. 

 O. Lymani, Ludwig, 1898. Die Ophiuren d. Sammliing Plate, Zool. Jahrb. Suppl., p. 751. 

 O. Lymani, Ludwig, 1899. Ophiuroideen Hamburger Magalh. Sammelreise, p. 5. 

 O. Lymani, Koehler, 1907. Revision de la collection des Ophiures du Mtis. d'Hist. nat. Paris. 



Bull. Sci. France Belgique, XLi, p. 295, pi. x, figs. 11-12. 

 Ophiura Lymani, H. L. Clark, 1915. Cat. Recent Ophiurans, p. 322. 

 O. Lymani, Koehler, 1923. Swedish Antarct. Exped. Asteries et Ophiures, p. 126. 

 Ophiuroglypha Lymaiii, Hertz, 1926. Deutsche Sudpolar-Exped. Ophiuroiden, p. 25, Taf. v, 



figs. 4-6, 8. 

 O. Lymani, Hertz, 1927. Deutsche Tiefsee-Exped. Ophiuroiden, p. 85. 



St. 152. 17. i. 27. 53° 51' S, 36° 18' W, South Georgia, 245 m. 2 specimens. 



St. 156. 20. i. 27. 53° 51' S, 36° 21' W, South Georgia, 200-236 m. Several large specimens. 



St. 159. 21. i. 27. 53° 52' S, 38° 08' W, South Georgia, 160 m. i specimen. 



St. 160. 7. ii. 27. Near Shag Rocks, South Georgia, 177 m. i specimen. 



St. 474. 12. xi. 30. I mile W of Shag Rocks, South Georgia, 199 m. i specimen. 



