PARAPNEUSTES CORDATUS. 173 



Prymnaster investigatoris. 



Koehler, 1914. Ech. Indian Mus. Spat., p. 196. 



This species is based on a single specimen, 15 mm. long, from Port Blair, 

 Andaman Islands. Koehler is himself doubtful as to its being a Prymnaster. 



Faorina. 



Gray, 1851. Ann. Mag. Nat. Hist., (2), 7, p. 132. 

 Type, Faorina chinensis Gray, 1851, loc. cit. 



This is one of the genera of which all the specimens available to me are bare 

 tests, but Koehler has so fully described the spines, pedicellariae, and internal 

 anatomy (1914. Ech. Indian Mus. Spat., p. 129) that the gaps in our knowledge 

 of the type species, the only Recent form, are now well filled. Originally known 

 only from Shanghai and Hong Kong, this species was taken by the Siboga 

 in the Flores Sea, and the Investigator has found it to be common in the 

 Gulf of Martaban, Burmah, and near the Andaman Islands. 



Parapneustes. 



Koehler, 1912. Zool. Anz., 39, p. 161. 

 Type, Parapneustes cordatus Koehler, 1912, loc. cit. 



This is an Antarctic group nearly related to the long and well-known genera 

 Tripylus and Abatus. The genus has been met with only by the Expedition 

 Charcot and then only twice. The two specimens taken appear to represent 

 different species, which are fully described and figured by Koehler in his report 

 on the Echinoderms collected by the Pourquoi-pas (1912. Ech. Exp. Charcot, 

 p. 164-175). 



Key to the Species of Parapneustes. 



V. d. less than half length; test abruptly narrowed posteriorly cordatus. 



V. d. .60 test-length; test not abruptly narrowed posteriorly reducing. 



Parapneustes cordatus. 



Koehler, 1912. Zool. Anz., 39, p. 161. 



The unique holotype of this species was taken west of Alexander the 

 First Land in 256 fms. Other specimens were taken but were too badly crushed 

 to be of any value. 



