PLATE LXIV. 



FIG. 



1. HALECIUM PLUMOSUM, p. 227, nat. size. 



1 a. Portion, magnified. 1 b. A calycle, more highly mag- 

 nified. From drawings by the Author. 



2. AOLAOPHENIA MYRIOPHYLLUM, p. 290, nat. size. From 



a drawing by Mr. T. West. 



2. A single calycle, magnified (T. H.). 



3. The corbula of AGLAOPHENIA TUBULIFERA, magnified. 



From a drawing by the Author. 



