EscHARA. Z. ASCIDIOIDA. 299 



again, leaving- certain hollow spaces between them ; their cells are 

 much smaller, though of the same shape with the cells in the folia- 

 ceous Millepore" (E. foliacea). Solander. — Pallas maintains that 

 it is merely a variety of the preceding ; but Milne-Edwards thinks 

 it ought to be retained distinct, for its peculiarity of ramification, and 

 the narrowness of the divisions, do not depend on age, and seem to 

 indicate a specifical difference. The cells in both are alike. 



