76 ART. 1. r. IKEDA I 



In the ulimeiilary cuiiul aiul tlie vascular system, there is 

 110 point requiring special mention. 



A male worm was discovered in the anterior muscular portion 

 of the oviduct. It is shown in Fig. lOo under low magnifica- 

 tion {"Xoß). Length about o.'S //u/i ; maximum breadth 0.20 /m//a. 

 The body narrows towards both ends. The entire surface is 

 thickly ciliated. No ventral hook is present. There is an 

 unpaired vas deferens {vd), about one-third as long the body- 

 length. It is thickest (0.07 ?nm. across) in the posterior two- 

 thirds of its length, ending with a relatively small funnel if''")- 

 The anterior one-third is slender, running forwards througli 

 the body-cavity finall_y to o})en to the exterior. The exterual 

 opening is situated not at the very tip of the body, but at a 

 ])oint a short distance behind it on the ventral side (x. Fig. 

 105). The alimentary canal is found in a state of degeneration 

 similar to that observed in the male of Bonellia »iiyajimai. It 

 does not form a continuous tube, l)ut is broken up into about 

 ten small pieces of different lengths and sizes [pa, Fig. 105). 

 These pieces are scattered in the body-cavity, being apparently 

 in no definite relation to one another. The blood corpuscles and 

 sperm-masses are found in abundance, Ijotli floating free in the 

 body-cavity. 



As to further details of the histology of the male, I have 

 been unable to obtain definite results, owing to the imperfect 

 preservation of the specimen. 



