554 Transaotions of the Soc-iety. 



(PL XXIX, fig. 19). We think there can be no doubt that the 

 internal spinous individual has developed from a spherule secreted 

 by the smooth-shelled parent, and that the specimen may be re- 

 garded as proof of the biological identity of these two dissimilar 

 forms, and of the small value to be attached to the development 

 of papillce. Perhaps, also, as proof of an alternation between these 

 two forms. 



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