ELIPNEUSTES RUBENS. 225 



his specimen is really longispinus. Their absence taken in connection with his 

 statement about his specimen having been collected by the Challenger leads 

 to the suspicion that perhaps his specimen is not longispinus. In view of the 

 fact, however, that it has lost the entire lower surface, the absence from it 

 of these particular pedicellariae is not inexplicable. 



Elipneustes. 



Koehler, 1914. Zool. Anz., 44, p. 191. 

 Type, Eurypneustes denudatus Koehler, 1914. Ech. Indian Mus. Spat., p. 73. 



Koehler first named this genus Eurypneustes but finding that name pre- 

 occupied, he promptly changed it to Elipneustes. The group is very near 

 Linopneustes on the one hand and Gymnopatagus on the other. In general 

 appearance it is more like the latter but the petals resemble more those of 

 Linopneustes. I have seen no specimens and can add nothing to Koehler's 

 account. 



Key to the Species of Elipneustes. 



Petals very long, reaching ambitus; large tubercles in interambulacra 1 and 4 abactinally 

 not confined within peripetalous fasciole; subanal plastron not wholly ventral in 

 position denudatus. 



Petals shorter, at least posterior not reaching ambitus; large tubercles in interambulacra 

 1 and 4 abactinally confined within peripetalous fasciole; subanal plastron ventral in 

 position rubens. 



Elipneustes denudatus. 



Eurypneustes denudatus Koehler, 1914. Ech. Indian Mus. Spat., p. 73. 

 Elipneustes denudatus Koehler, 1914. Zool. Anz., 44, p. 191. 



Many specimens of this fine species were taken by the Investigator at 

 a single station west from Colombo, Ceylon, in 143 fms. 



Elipneustes rubens. 



Eurypneustes rubens Koehler, 1914. Ech. Indian Mus. Spat., p. 89. 

 Elipneustes rubens Koehler, 1914. Zool. Anz., 44, p. 191. 



This species was taken twice by the Investigator, once off the Malabar 

 coast in 68-148 fms., and again south of Ceylon in 109-132 fms. It approaches 

 more nearly to Gymnopatagus than does its larger congener, but still it will 

 hardly fit into that genus. 



