2 



Art. 6. -I. Ikwla and Y. Ozald : 



the encystment entirely untouched. In the Boveria species studied 

 by us, we have been fortunate enough to make observations on 

 these phenomena, Wie results of which seem to deserve publishing. 

 As to the Licnophora species, we have not yet finished our studies, 

 so that we will reserve its description until a future occasion. 



Before going further, we feel it our pleasant duty to express 

 our hearty thanks to Professor Ijima for his kind advice and 

 criticism during the writing and publishing of this paper. We are 

 also much indebted to Mr. B. Aoki, formerly of the Anatomical 

 Laboratory of the Kiu-Shiu Imperial University, for his kind help 

 in the matter of obtaining some of the relevant literature. 



Fig. 1. 



■c.v* 



I. Description of Boveria labialis n. sp. 



The present species of Boveria lives in abundance not only 



in the respiratory trees of the holo- 

 thurian hosts mentioned before, bat 

 also in the gill-lamella3 of a T'ellma 

 species. The animals (fig. 1) are 

 of the shape of a trumpet, being 

 31— 100 /i in length. The aboral 

 end, with which the animals are 

 usually found adhering to the inner 

 surface of the respiratory organs of 

 the host, is rounded and measures, 



j^ _^^ /' as ascertained on preparations fixed 



:; ' . with Schaudinn's solution, 8 — 16 /^ 



in diameter. The broader, slightly 

 elevated end, measuring IG — 26 /^ 



An individual GO u long. Del's. hfema- • • iji j. j.i • j. i 



. ,. , ,., , , . T ni Width, represents tlie peristomal 



toxylm. C.V., contractile vacuole; /.f., fool ■•• ^ 



vacuoles ;/., lip-like process of peristomal digc. Appended tO it OU OUC Sidc, 



disc; m., mouth; K, meganucleiis ; n, 



micronucicus ; s.g., spiral groove. IS an autcriorly dircctcd rod-likc 





yy- 



-■^rv/;^ 



