THE ECHINODERMATA. 



BY THOMAS WHITELEGGE. 



THE Collection of Echinodermata comprises one hundred and 

 thirty specimens representing nineteen species, most of which 

 belong to well known forms, common to the Pacific coral reefs. 



Although devoid of new species, the material includes a few 

 rare examples of great interest not hitherto represented in the 

 Museum Collection. 



The following are the Orders represented : 



Species. 

 Echinoidea ... ... ... ... 7 



Asteroidea ... ... ... ... 3 



Ophiuroidea ... ... ... ... 3 



Holothuroidea ... ... ... ... 6 



The species of interest are Echinolhrix turcarum, Echinometra 

 oblonga, Laganum depressum, Ophidiaster cylindricus, Culcita 

 acutispinosa, Ophiarthrum elegans, and Holothuria imitans. 



The Culcita acutispinosa has been noticed at some length, and 

 the non-specific value of external form has also been pointed out. 

 In a subsequent article by Mr. Waite a note will be found on 

 the commensalism of Fierasfer with Holothuria argus. Mr. 

 Saville Kent has recorded a species of Fierasfer as occurring in 

 in the body cavity of Holothuria mammifera, on the Queensland 

 coast.* In this connection I venture to suggest that future 

 observers should try to ascertain if Fierasfer is ever found 

 in members of the genus Muelleria. Possibly the presence of 

 anal teeth in Muelleria may be of use in excluding the fish from 

 the body cavity. 



ECHINODERMATA. 

 ECHINOIDEA. 



ECHINOTHRIX TURCARUM, Schynv. 

 Echinothrix turcarum (Schynv.), Agassiz, Rev. Echini, Mem. 



Mus. Comp. Zool., iii., p. U6, pi. Ilia, fig. 3. 

 Six specimens, in the two largest the spines are of a uniform 

 dark colour, whilst the four smaller examples have the spines 



* Saville Kent Great Barrier Keef, 1893, p. 240. 



