EXPLANATION OF PLATE XXXIV. 



FIGURE 257. Alcyonidium ramosum, (p. 703 ;) a young unbranched specimen, enlarged 



two diameters. 



258. Bugula turrita, (p. 712;) extremity of a branch, enlarged. 

 259. The same ; a branchlet more highly magnified. 

 259a. The same ; a branchlet bearing ovicells. 

 260. Crisia eburnea, (p. 707;) a cluster of branches, enlarged. 

 261. The same ; a branch bearing an ovicell, more highly magnified. 

 262. Membranipora pilosa, (p. 712 ;) a few of the cells, seen from above, 



magnified. 



262a. The same ; a single cell, seen in profile. 

 263. The same ; one of the zooids expanded. 

 264. Mollia hyalina, (p. 713 ;) one of the zooids in expansion, highly magnified. 



(Figures 257, 259, 259a -were dravn by A. E. Yerrill ; the rest were furnished by A. Hyatt.) 



