Fig. 12 . 
Hyalonema sieboldii, the Glass-Rope Sponge. (One-fourth natural size.) 
Note. — A crust of Palythoa. a zoophyte associated with this sponge, had unfor- 
tunately become detached from the upper end of the “ Glass-Rope,” and 
is not shown in the illustration. 
To face p. 28 . 
