been produced by a sexual process. 



Glaus and Goette agree in regarding the lining of the pro- 

 boscis as of ectodei-mal origin in Aurelia and Cotylorhiza. It 

 is therefore probable that this is true also of Gassiopea and 

 that the proboscis is formed as a crater-like fold of the ec- 

 toderm surrounding the mouth opening. If I were sure of this 

 I wouIq go a step farther than C-oette and, judgir^ from the 

 histology, say that not only the interior of the proboscis but 

 also parts of the septa are clothed with ectoderm. The parts 

 of the septa referred to appear to give rise to the gastric fil- 

 aments. This would be further confirmation of Goette 's theory 

 if it were -not for the fact that these filaments are not devel- 

 oped in the Anthozoan stage but long ai'terward, at about the 

 time that the medusa becomes free. I do not believe that 

 there is any homology between the gastric filaments in the two 

 groups, Anthozoa and Scyphomedusae. 



At first there are eight tentacles, four of them in the 

 radii of the septa and four interseptal. ViQien the larva is 

 regular the additional tentacles arise in cycles of eight, there 

 being next sixteen, then twenty-four and finr.l ly thirty-two ; 

 out the interpolation of other tentacles is very common. 



Agassiz and Glaus have stated tliat the rhopalia in Aurelia 

 are developed in the basal portions of tentacles. This I find 



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