112 



ü. TAKAKURA. 



LITERATURE. 



(1) V. Kennel — Beiträge zur Kenntniss der Nemertiaen. Arbeit Zool.-Zoot. last. 



Würzburg Bd. IV, 1878. 



(2) A. C. Oodemans — The Circulatory and Nephridial Apparatus of the Xemert^i 



Quart. Journ. Micro. Sei., Sappl., 1883. 



(3) A. E. Verrill — Marine Xemerteansof New England and Adjacent Waters. Trans. 



Connect. Acad. vol. 8, 1893. 



(4) L. JouBiN — Les Xémertiens, 18!) 1. 



(5) O. Bürger— Die Nemertinen des Golfes von Neapel, 1895. 



EXPLANATION OP FIGURES. 



AC. large acetabular commissure, ac.c. small acetabular commissure. 

 ae. r. acetabular vessel, an. anus. b.r. blood vessel, d. ». dorsal vessel. 



D'.i'. large branches of the dorsal vessel, in. intestine. I.V. lateral 

 vessel, net. w. net-work of canal system. 



Oes. oesophagus. Pr. proboscis. Uli. lîhynchocœloiri. 

 liet. Retractor muscle of the proboscis. 

 Dorsal view of young M. japnnica. 

 Vertical section of the end of the rhynchocoelom. 



Blood vessels in the head of the adult, reconstructed from sections ; Md 

 median line The vessels on the ventral side are shaded. 

 Blood vessels in the middle region of the adult, reconstructed from 

 sections. 



Blood vessels in the anal region of the adult, reconstructed from sections. 

 Vertical section of the anal region, -showing the acetabular commissures 

 of the lateral nerve stems. 



Fig. 1. 

 2. 



3. 



4, 



C. 



Printed July 25, 189? 



