80 



ERNEST WARREN. 



and it is not merely an individual polyp vai'iation. Thus, all 

 the polyps of a colony tend to have the capitate tentacles in 

 whorls, or all tend to be irregular in the character. 



In the accompanying diagraiii a view from above is sup- 

 posed to be taken. The circles are the " heads " of the 

 tentacles. Three distinct stages may be observed : 



In fig. 1 some twelve tentacles are irregularly scattered. 



In fig. 2 the distal verticil of four is acquired, and these are 

 joined together by a circle as in a floral diagram. 



In fig. 3 the number of tentacles is reduced to eight, and 

 they are arranged in two whorls in the typical manner. 



If more material comes to hand, a statistical investigation 

 with respect to this matter will be made. 



The present species also agrees with Halocordyle 

 tiarella, in that the gonophores arise above the whorl of 

 filiform tentacles and not in the verticil. 



It differs from Halocordyle tiarella and from Pen- 

 naria in that the gonophores are adelocodonic, and no 

 processes representing marginal tentacles on the umbrella 

 were found in the female gonophore. 



The species Ilalocodyle cooperi is named after my 

 friend JVlr. Arnold Cooper, who was shore-collecting with me 

 at the time it was discovered. 



