16 JOHNS HOPKINS UNIVERSITY MORPHOLOGICAL MONOGRAPHS. 



the development of both the solitary and the aggregated salpa proves that 

 there is no basis for this opinion. 



On the contrary, the facts of embryology are in perfect accord with 

 the teachings of comparative anatomy, and can be explained in only one 

 way, that is, by unqualified acceptance of the view of the older writers, 

 that the atrium of Salpa is the same chamber as the atrium of the ordi- 

 nary tunicates. 



This short sketch is not intended to be an account of the structure of 

 salpa, and it is given only to enable the reader to follow the account of 

 the life-history which follows. 





