No. 6.] THE MORPHOLOGY OF THE ACTINOZOA. 27 1 



Streaks in the Anthozoa. H. V. Wilson may be quite correct 

 in maintaining an ectodermal origin for the glandular streaks 

 of the first four mesenteries of Manicina ('88), and altogether 

 wrong when he extends this origin to the streaks of the later 

 formed mesenteries. 



I would conclude, from my own observations, that the cili- 

 ated bands are probably in all cases ectodermal, and that, in 

 some mesenteries at least, the glandular streaks are endodermal ; 

 yet I am prepared to accept as correct the ectodermal origin of 

 the glandular streaks in other mesenteries. It is to be under- 

 stood that I use the terms "ectodermal" and "endodermal" 

 here merely for convenience and not as expressing a definite 

 homology. 



Anatomical Laboratory, 



University of Michigan, 

 March 13, 1S99. 



