Hf. James-Clark—The American Spongilla. 3 435 
op and expanding, draw in current through its open afferent 
ostloles, 
We regret that we have not the means, in this locality, for 
completing these researches. Our specimens were gathered; and 
studied on the spot where they lived, in the western part of 
Massachusetts, several Bicndeed miles away from our present 
Tesidence. Unfortunately we put off the attempt to feed the 
awe with colored matter until we had completed other me- 
thods of investigation, and then we were prevented, by circum- 
stances, from carrying out our designs. 
In regard to the afferent and efferent canals, seen by Carter 
(Ann. Mag. Nat. Hist., 1857, ut sup.) in the monadigerous mass 
(“ parenchyma” Carter), we have not met with any trace of them 
in the species described in this article. It is ag that they 
May exist in the oldest and largest individuals, but as we 
worked, only, on very small and transparent specimens, our 
tirect observations, in this respect, strictly apply to the latter. 
It is more likely that ours is a different genus from the Spongilla 
of Carter, in favor of which we cite the curious fact that each 
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ivesting membrane, exactly overlies and is mseparable from 
the entrance to a monad-chamber (‘ ampullaceous sac ;” partim, 
Carter); so that whatever enters these chambers must go out 
by the same way that it came in; not out into a system of 
