212 DISCOVERY REPORTS 



The single very young specimen is too young (4 mm. h.d.) to be identified with cer- 

 tainty ; it might equally well be referred to C. speciosa. But as it was found together with 

 the adult C. Perrieri, whereas C. speciosa was not found at this station, there is the pro- 

 bability that it is C. Perrieri. 



Ctenocidaris Geliberti (Koehler) 



(Plate IX, fig. 8) 



Eurocidaris Geliberti, Koehler, 1912. IP Exped. Antarct. Fran9aise. Echinodermes, p. 146, 



pi. xiv, figs. 1-8. 

 E. Geliberti, Koehler, 1926. Austral. Antarct. Exped. Echinod. Echinoidea, p. 22, pis. 102, 



fig. 8; 119, fig. 3. . , , ■• 



Ctenocidaris Geliberti, Mortensen, 1928. Monogr. Echinoidea. I, Cidaridae, p. 126, pi. Ixxvn, 



fig. 9. 



St. 599. 17. i. 31. 67° 08' S, 69° 06' W, 203 m. I specimen. 



This is a young specimen, still without a trace of the genital openings, although of a 

 fairly large size, 20 mm. h.d. This indicates that this species grows to a considerable 

 size. The type, and only specimen hitherto known, is 30 mm. h.d. 



As in the type specimen one of the oculars is insert. It is Oc. IV, as seems to be the 

 case also in the type ; this then may not improbably be a specific character. In the type 

 specimen no large globiferous pedicellariae were found; Koehler even says {op. cit., 

 1926) that they do not exist in this species. The present specimen shows this to be a 

 mistake, a couple of large globiferous pedicellariae being found on its apical system. 

 The valves (Plate IX, fig. 8) are long and slender, much as in C. spinosa (Koehler) 

 (cf. Monogr. Echinoidea. I, Cidaridae, p. 125). 



The young developing upper primary spines are greenish. The denuded test is 

 white. 



The locality of this specimen is close to that of the type specimen (Bale Marguerite) ; 

 also the depth is the same. 



Austrocidaris canaliculata (A. Agassiz) 

 (Plate I, fig. i) 



Austrocidaris canaliculata, Mortensen, 1910. Swedish South Polar Exped. Echinoidea, p. ii, 



pis. iii, figs. 6-8; iv, figs. 4-1 1 ; xiv, figs. 1-2, 6-1 1, 16-18. 

 A. canaliculata, H. L. Clark, 1925. Cat. Recent Sea-Urchins Brit. Mus., p. 27. 

 A. canaliculata, Mortensen, 1928. Monogr. Echinoidea. I, Cidaridae, p. 141, pis. xvi, figs. 14-15 ; 



Ixxvii, fig. 18. 



St. 51. 4. V. 26. Off Eddystone Rock, East Falkland Islands, 105-115 m. 2 specimens. 



St.WSSi. 19. iii. 27. 8milesNii°Wof North Island, West Falkland Islands, 81-82 m. Several 

 specimens. 



St. WS 82. 21. iii. 27. 54° 06' S, 57° 46' W, 140-144 m. 2 specimens. 



St. WS 84. 24. iii. 27. 7I miles S 9° W of Sea Lion Island, East Falkland Islands, 74-75 m. 

 9 specimens (young). 



St. WS 85. 25. iii. 27. 8 miles S 66° E of Lively Island, East Falkland Islands, 79 m. Several 

 specimens. 



