3IO DISCOVERY REPORTS 



this supplementary plate is replaced by a small adradially-directed papilla.) Whether 

 this is a constant difference it is, of course, impossible to ascertain from the single, very 

 large specimen of O. laevigata (all the present specimens of O. Doderleini have it as 

 described) ; but in any case I deem it better for the present to retain the name Doderleini. 

 When new material of the Kerguelen form has been collected, it can be ascertained 

 whether this difference holds good ; if it does not, the name Doderleini will become a 

 synonym of laevigata. (The specimen of O. laevigata examined has apparently lost the 

 granules of the disk.) 



The removal of this species from the genus Ophiomaria, to which it was referred by 

 Austin H. Clark as accepted by Koehler, to Ophiogona, leads to the question whether 

 Clark's genus Ophiomaria is not identical with the genus Ophiogona. I believe so; at 

 least I do not find in the diagnosis of the genus Ophiomaria a single character that dis- 

 tinguishes it from Ophiogona. The reason why I hesitate to declare Ophiomaria a 

 synonym of Ophiogona, is because the genotype of Ophiomaria, O. tenella, A. H. Clark, 

 has never been figured. Perhaps it may be found to differ so much from Ophiogona 

 laevigata and Doderleini in some point or other (though from the description that does 

 not appear) that it may deserve to rank as the type of a separate genus. 



Ophioperla Koehleri (Bell) 



Ophiura Koehleri, Bell, 1908. National Antarct. Exped. Echinoderma, p. 11. 



Ophioperla Ludwigi, Koehler, 1912. Ophioperla Ludwigi, nov. gen., nov. sp. Zeitschr. wiss. 



Zool., ci, p. 259, Taf. xiii. 

 O. Ltidivigi, Koehler, 19 12. IP Exped. Antarct. Fran9aise. Echinodermes, p. 126, pi. x, 



figs. I, 5-7. 

 O. Ludwigi, Koehler, 1922. Austral. Antarct. Exped. Echinod. Ophiuroidea, p. 51. 

 O. Litdivigi, Koehler, 1923. Swedish Antarct. Exped. Asteries et Ophiures, p. 127. 



St. 42. I. iv. 26. Off mouth of Cumberland Bay, South Georgia, 120-204 "^- 'O specimens. 



St. 45. 6. iv. 26. 2-7 miles S 85° E of Jason Light, South Georgia, 238-270 m. 3 specimens. 



St. 140. 23. xii. 26. Stromness Harbour to Larsen Point, South Georgia, 122-136 m. i specimen. 



St. 144. 5. i. 27. Off mouth of Stromness Harbour, South Georgia, 155-178 m. 4 specimens. 



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. i specimen. 



St. 177. 5. iii. 27. 27 miles SW of Deception Island, South Shetlands, 1080 m. i specimen. 



St. 196. 3. iv. 27. Bransfield Strait, South Shetlands, 720 m. 2 specimens. 



St. 474. 12. xi. 30. I mile W of Shag Rock, South Georgia, 199 m. 10 specimens. 



To the very careful description given by Koehler {op. cit., 191 2) I would only add 

 that the radial shields sometimes remain naked to some extent, so as to appear as small, 

 widely separated, oval plates. 



One of the specimens from St. 42 is stated to have had the upper side of disk and arms 

 bright pink in life, the under side white. In alcohol all trace of colour is lost. 



In young specimens, 3-4 mm. in diameter of disk, the scales of the dorsal side of the 

 disk are almost completely naked, a granule having only begun to appear here and there. 

 There is a distinct central plate, but the other primary plates are scarcely discernible ; 

 the scales of the disk are imbricating. The radial shields are short and broad, widely 



