42 



MR JOHN RENNIE 



are given in the following table, together with the text-figures. The particulars 

 regarding the first three forms are derived from the monograph of de Marval.* 



A consideration of the foregoing table and figures shows that E. antarcticus differs 

 from each of the other species in more than one particular, and likewise has some points 

 of agreement with each. I shall not recount the full details, but one or two points 

 deserve further comment. While, as regards form, E. antarcticus is unique, there is a 

 remarkable agreement in the distribution of spines upon it and upon E. hystrix. With 

 this species it agrees also in the characters of the sub-cuticular canals. It, however, 

 differs from it in the number and size of rostral hooks, in the absence of the false 



* Torn, cit., pp. 281, 308, and 318. 

 (ROY. soc. OF EDIN. PROC., VOL. xxvi., PP. 443-445.) 



