128 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



eacli gland. Each gland is turned over at the perradial sides and forms 

 a part of the mesentery (fig. 2). 



Small specimens (3 to 4 mm. in umbrella diameter) of the collection 

 differ more or less from larger specimens in the proi)ortion of the parts 

 of the body, number of tentacles, and genital sacs, etc. Generally, 

 smaller specimens have the narrower umbrella, longer peduncle, shorter 

 arms shallower umbrella cavity, fewer and not much crowded genital 



r 





■^ 



\ 

 \ 



Fig. 3.— Haliclystus ste.inegeri. An immature form, 3 mm. in height, drawn from a prkparation 



in transbiitted light. 

 Drawn by J. Urata. 



sacs, and a very little i)igment inendoderm epithelium. Moreover, the 

 genital sacs vary in size much more greatly than in larger si^ecimens. 

 The peduncle is not four-chambered. Such differences may be easily 

 understood by comparing figs. 1 and 2 with fig. 3. 



Almost all the specimens of the collection were found to contain a 

 number of Gammarus in the stomach. 



