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EURETE ERECTUM. 



SCOPULES OF THE DIFFERENT FORMS OF EURETE ERECTUM. 



the specimens examined by Schulze and Wilson and those described in this 

 paper indicate that the former differ from the latter quite as much as the latter 

 differ among themselves. This is particularly noticeable in that the former 

 possess dermal scopules with only two end-rays, which are absent in the latter, 

 and that the gastral pentactine-like pinule-derivatives of the former are much 

 larger than the corresponding spinules of the latter. The general agreement of 

 all these sponges, the localities from which they were obtained, and particularly 

 the fact that the differences between them appear to be virtually confined to the 

 superficial spicules, which are of course most liable to be influenced by the 

 environment, make it very doubtful, however, whether they should be considered 



