H. James-Clark—The American Spongiila. 429 
ments here; namely, the inner division (c) of the investing 
membrane, and the groups of monads (h) which are imbedd 
in it, below its surface. In a fully expanded individual these 
groups seldom lie so closely as to touch each other. They 
vary considerably in size and are usually globular or spheroidal, 
and form a single stratum, with rather narrow interspaces (c’) 
between them. 
It seems proper here, at least for the sake of precision, that 
the cytoblastematous basis, in which the monad groups are im- 
where the body stands out an irregularly rounded mass, some- 
times an inch in diameter, the cytoblastematous basis fills mel 
- interior, in enormous proportion to the bulk of the mona 
ayer, 
ORGANOGRAPHY. 
a very diffuse cytoblastema (a') and irregularly disposed cells 
(6,02) scattered through it. The intercellular cytoblastema 
_ forms a very thin layer (a*) between the cells (6); but where 
_ divisions) presents in profile (a', c, d) such an irregular thickness. 
| toblastema (a*) is colorless, hyaline, and apparently homo- 
power; but, when magnified to about four 
it capi a very finely granular aspect. 
