DIPLOBRACHIA JAPONICA 



375 



long by 0-16-0-18 mm broad; length of the metameric part, 2-5-3-0 mm; 

 length of the whole preannular region, 17-5-30 mm; postannular region, 

 16-25 mm; overall length of the body together with the tentacles in a few 

 individuals reaches 72 mm. 





Hi 



Fig. 151. Diplobrachia japonica : A - spermatophore ; В - front 

 part of the tube; С - a portion of the front half of the tube; 

 D - a portion of the hind part of the tube. 



The filamentary end of the very narrow, leaf-shaped spermatophores is 

 rounded; the opposite end is pointed (Fig. 15 Ы). The broadest part is near 

 the base of the filament, about one-ninth of the way along. From there to 

 the afilamentar end it tapers gradually and evenly. 



