240 DISCOVERY REPORTS 



Gorgonocephalus chilensis (Philippi) 



Gorgonocephaliis cMlefisis, Doderlein, 191 1. Japanische und andere Euryalae, pp. 30, 105, Taf. v, 



fig. 5; viii, figs. I, I «. 

 G. chilensis, H. L. Clark, 1915. Cat. Recent Ophiurans, p. 185. 

 G. chilensis, Koehler, 1923. Swedish Antarct. Exped. Asteries et Ophiures, p. loi, pi. xiv, 



fig. I. 

 G. chilensis, Doderlein, 1927. Indopacifische Euryalae, pp. 30, 92. 

 G. chilensis, Zirpolo, 1932. Siil Gorgonocephalus chilensis, Lyman. Ann. Mus. Zool. Univ. 



Napoli, VI, 7, pp. 1-16. 

 Non: Gorgotiocephaltis chilensis, H. L. Clark, 1923. Echinoderm Fauna South Africa, p. 318 



{ = Gorgonocephalus pectinatus, Mortensen). 

 For the older literature I may refer to Doderlein's work of 191 1 (/oc. cit.). 



St. 51. 4. V. 26. Off Eddystone Rock, East Falkland Islands, 105-115 m. i large specimen. 



St. 158. 21.1.27. 53° 48' S, 35° 57' W, South Georgia, 401-41 1 m. 2 specimens, one large, 

 ca. 70 mm. diameter of disk, one small, 20 mm. diameter. 



St. 160. 7. ii. 27. Off Shag Rocks, South Georgia, 177 m. i young specimen, 9 mm. diameter 

 of disk. 



St. 181. 12. iii. 27. Schollaert Channel, Palmer Archipelago, 160-335 "i- 3 specimens. 



St. 576. 17. iv. 31. Falkland Islands, 34-24 m. 2 large specimens. 



St. WS 72. 5.111.27. 5i°07'S, 57° 34' W, Falkland Islands, 79 m. i specimen, ca. 65 mm. 

 diameter of disk. 



St. WS 73. 6. iii. 27. 51° 01' S, 58° 54' W, Falkland Islands, 121 m. 2 specimens. 



St. WS 76. II. iii. 27. 51° 00' S, 62° 02' W, Falkland Islands, 207-205 m. 3 specimens. 



St. WS 80. 14. iii. 27. 50° 57' S, 63° 37' W, Falkland Islands, 152-156 m. 2 specimens, young, 

 8 and 15 mm. diameter of disk. 



St. WS 829. 31. i. 32. 50° 51' S, 63° 13' W, Falkland Islands, 155 m. 4 specimens. 



This species vi^as not hitherto known to occur as far south as South Georgia and the 

 Palmer Archipelago. The larger of the specimens from South Georgia has almost naked 

 radial ribs, but does not otherwise differ from typical G. chilensis ; in the smaller speci- 

 men, on the other hand, the radial ribs are rather unusually strongly spiny. On the 

 whole, there is much variation in the development of "stumps" on the disk. In the 

 young specimens of G. chilensis the disk is densely covered by a uniform granulation, 

 which is, again, remarkably coarse in the specimen from the Shag Rocks Bank. On the 

 largest of the specimens from St. WS 829 a couple of young ones, 3 mm. in diameter of 

 disk, were found attached. Already at this size the disk is covered by rounded granules, 

 none of the primary plates remaining distinct. 



In the young specimens the hooks are already present at the base of the arms, but 

 only on the sides, not forming complete belts till beyond the second forking, and in the 

 adult specimens still farther out. 



The larger specimen from St. 158 is stated in a note to be thus coloured: "Disk 

 whitish, arms salmon-pink, deepest at tips." 



Two specimens were opened in order to see whether they might be infested with 

 Proiomyzostoma ; nothing of the kind was found. The eggs are small and the gonads 

 exceedingly numerous, much as in Gorgonocephalus eucnemis, etc. ; the presence of young 

 ones on one of the specimens is thus, as in other species, a casual attachment of the 



