320 Proceedings of the Ro//al Irish Academy. 



Of the spicules he says : — " The verrucae spicules show a modification of 

 the same type as those of the general cortex, being only more elongated than 

 those, and bearing two or sometimes three distinct whorls of tubercles, 

 besides a few median terminal ones on each half of the spicule ; the two 

 inner whorls almost meet in the middle, so as to obliterate the median bare 

 zone, whicli is characteristic of the cortical spicules." 



"Wliile working on the coast of Lower Burmah I was fortunate in 

 obtaining a large number of this very interesting species ; and these have 

 formed the basis of a somewhat detailed study. The following table gives a 

 few of the measurements of some of these ; and notes have been added where 

 it was considered necessary. Taken in conjunction with the various 

 paragraphs which follow, it may serve to elucidate the more important 

 characters of this species. 



