ECHINODEEMA. 

 I. 



By F. Jeffrey Bell, M.A. 



Emeritus Professvr and Fellow of Kliufs College ( University of Lioulon). 



(5 Plates.) 



Had it not heeu for the earlier return of the 'Gauss,' this report would probaMy 

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

 genus, Promachocrinus, which, as its name denotes, was one of the prizes of the voyage 

 of the ' Challenger.' 



As in the collection of the ' Southern Cross,' 1 am again al)le to call attention to 

 some remarkable variations within what are 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 

 ret'cived by two naturalists, wlio made a number 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 varialjility of species of 

 Echinoderms is now beyond question. 



A.-ANACTINOGONIDIATA. 



I. HOLOTHURIUIDEA. 



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

 revealed ])y Prof. MacBride and Mr. Simpson in their valuable report on the larvae, 

 which follows this memoir. 



Chix{iuota. 



T sul)mitted an example of a form taken at 100 fms., ofi' 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 is true that C. siinph-x was found .it Trinidaa Channel, and the 'Challenger' specimens on the eastern 

 side of Tatagonia ; but he who will look at a mai? of South .\meriea will smile at a " Chorological Synopsis of 

 the species " which gives three to the Atlantic and one to the Pacific. 



