ECHINODEBMA. 

 I. 



By F. JKKFRKY BKLL, M.A. 



Emeritus Professor and Fellow of King's College ( University of Lotulon). 



(5 Plates.) 



HAD it not been for the earlier return of the 'Gauss,' this report would probably 

 have hud the distinction of signalising the re-discovery of the interesting Crinoid 

 genus, Prontachocrinu.*, which, as its name denotes, was one of the prizes of the voyage 

 of the ' Challenger.' 



As in the collection of the ' Southern Cross,' I am again able to will attention to 

 some remarkable variations within what arc obviously the limits of single species. 

 The specimens which exhibit these variations could not have been obtained but 

 by very careful collecting, and in the case of Cycethra it is of importance to note 

 that they were all taken in a comparatively small area ; the examples of this genus 

 received by two naturalists, who made a numl>er of species with them, were all taken 

 from stations comparatively close to one another,* but it is to be hoped that such a 

 course will never be taken again ; evidence as to the variability of species of 

 Echinoderms is now beyond question. 



A.-ANACTINOGONLDIATA. 



I. HOLOTHURIOIDEA. 



The collection of Holothurians is small, and the points of greatest interest are 

 revealed by Prof. MacBride and Mr. Simpson in their valuable report on the larvae, 

 which follows this memoir. 



CHIRIDOTA. 



I submitted an example of a form taken at 100 fms., off Coulman Island, to 

 Prof. Ludwig, who has made Antarctic Synaptids one of his special domains. Owing, 

 apparently, to the unfortunate use of formol the spicules are so disintegrated that a 

 definite judgment is impossible, but it seems probable that the species Is C. pisanii or 

 allied thereto. 



It U true that C. timplejc was found at Trinidad Channel, and the Challenger ' trpeciniem on the eastern 

 ride of Patagonia ; bat he who will look at a map of South America will xinile at a " Chorological Hynopnu of 

 the specie* " which give* three to the Atlantic and one to the Pacific. 



