86 
have been favoured with it from the Rev. Hugh Davies, of 
Anglesea. It is generally found attached to shells, and 
other marine productions, but apparently detached from 
rocks, as it is generally among the rejectamenta of the sea. 
Although we think it may have some curious inhabitant, 
we have not been so lucky as to detect any ; nor do we 
know that the inhabitants of Sponges have been detected, 
unless the egg-like substances found in Spongia Jiuviatilis 
may be such. We hope, however, that those who have 
opportunity will examine into this subject, as it remains in 
great doubt. Many foreign Sponges are tubular, and pro- 
bably ought to be examined on the rocks on which they 
are formed, to detect the animal. 
