H. James-Clark—The American Spongiila. 431 
the whole organism is contrived and constructed. They are 
ess circular, areas scattered in pretty close proximity to each 
other over the “cytoblastemic mass.” Each chamber has a 
Xtreme border, an i 
of the investing membrane becomes evident. 
*The hollow groups of monads were originally descibed by Carter (Ann. Mag. 
Nat. Hist., July, 1857) as lining an hypothecated vesicle. he named ne 
“ampullaceous sac.” He has since (Ann. Mag., Jan., 1859) revoked that view 
another. We believe him to be, excepting the inferred “ampull ‘ 
” in the main, right in his first interpretation ; but as our species are differen 
We cannot speak definitely. 
