EXPLANATION OF PLATE XXXIV. 



FIGURE 257. Alcyonidinm raniosum, (p. 70-' ;) a young uiibrancbed specimen, enlarged 



two diameters. 



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

 'J.Y.i. The same: a branchlet more highly magnified. 

 259a. The same; a hranchlet bearing ovi cells. 

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

 21H. The same; a branch bearing an ovicell. more highly magnified. 

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



magnified. 



26'2a. The samr : a single cell, seen in profile. 

 263. The same ; one of the zooids expanded. 

 264. Molliu hyaliua, (p. 713 :) one of the zooids in expansion, highly magnified. 



<Figures 237, 259. 25!)a were drawn 'ny A. E. Verrill ; the rest were furnished by A. Hyatt.) 



