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have been favoured with it from the Rev. Hugh Daviesj 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 fluviatilis 

 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 fprmed, to detect the animal. 



