264 DISCOVERY REPORTS 



Family ERYLIDAE 

 Genus Erylus, Gray 

 Erylus discophorus (Schmidt). 



(For synonymy see Lendenfeld, 1903, p. 87.) 



Occurrence. St. 6: Tristan da Cunha, 80-140 m. 



Remarks. The present specimen forms a thin brown crust on the surface of a piece 

 of rock. The skeleton is composed as follows: amphistrongyles, 075 by o-oiamm. ; 

 dichotriaenes, shaft 0-4 mm. long, primary cladi, 0-15 mm. long, and secondary cladi, 

 o-i8mm. long; sterrasters, 0-15 by 0-09 by 0-012 mm. ; oxyasters, with 5-12 rays, 

 o-024-o-o6 mm. in diameter, the larger spicules having usually the smaller number of 

 rays ; centrotylote microxea, 0-045 by 0-002 mm. In spiculation therefore the specimen 

 agrees closely with the Mediterranean examples of the species except for the presence 

 of strongyles instead of oxea. On the other hand, I am strongly inclined to the view that 

 the spicules of the various species of Erylus may vary a great deal more than has hitherto 

 been suspected, judging by my observations on a number of specimens of this genus 

 from the Indo-Pacitic. 



The following species from the Atlantic, and adjacent waters, E. discophorus, E. tnam- 

 millaris, E. transiens, E. jnnmmilifer, E. grafiuloris and E. chavesi, and E. oxyasier from 

 the Galapagos Islands, all agree in possessing oxea, or their derivatives, dichotriaenes, 

 sterrasters, oxyasters and microxea. The differences between them amount to no more 

 than small, and probably unimportant, differences in external form and spiculation, and 

 it is highly probable that they all represent nothing more than a single species. 



Distribution. Mediterranean; Spain. 



Sub-order SIGMATOSCLEROPHORA 

 Family TETILLIDAE 



Genus Tetilla, Schmidt 



Tetilla leptoderma (SoUas). 



(For synonymy see Burton, 1929, p. 418.) 



Occurrence. St. 39: South Georgia, 179-235 m.; St. 140: South Georgia, 122-136 m.; St. 148: 

 South Georgia, 132-148 m.; St. 170: Clarence Island, 342 m.; St. WS 27: South Georgia, 106- 

 109 m.; St. WS 218: north of Falkland Islands, 3 1 1-247 m.; St. WS 225: Falkland Islands, 

 162-161 m.; St. WS 243 : north-east of Falkland Islands, 144-141 m. 



Distribution. Kerguelen; South America; Victoria Land. 



Genus Cinachyra, Sollas 

 Cinachyra antarctica (Carter). 



(For synonymy see Burton, 1929, p. 419.) 

 Occurrence. St. 42 : South Georgia, 120-204 m. ; St. 175 : South Shetlands, 200 m. 

 Distribution. Graham Land; Victoria Land; Wilhelm Land. 



