PLATE XIX. 



FIG. 



1. HYDRANTHEA MARGARICA, p. 100, magnified. 



1 . One of the tentacles bearing a cluster of thread-cells, 



magnified. 1 b. One of the branched vessels of 

 the sporosac. 1 c. Bean-shaped thread-cells, mag- 

 nified. From drawings by the Author. 



2. BOUGAINVILLIA RAMosA, p. 109, nat. size. From a 



drawing by Mr. Tuffeii West. 



2 a. A branchlet, magnified, to show the cup-like expan- 



sion of the polypary around the polypite (T. H ). 

 2 b. A branchlet, bearing a gonophore, magnified 

 (T. H.) . 2 c. The gonozooid, at the time of detach- 

 ment, highly magnified. After Van Beneden. 



.'5. BOUGAINVILLIA ? species, p. 1 12, nat. size. 



3 a. The same, magnified. From drawings by the Author. 



