35? 



U. ÖHSHIMA : GIGANTIC AURICUUARIA. 



canal, though it differs much from the early stage of that canal in 

 other Echinoderm larva- in having very thin epithelial wall. 



In two large preserved specimens I have found in the mid-gut, 

 and also imbedded in the gelatinous mesenchyme, a species of 

 Trematode to a number of more than ten in each. The parasite 

 possessed ;i pair of eyes and measured 0.17-0.23 mm. in length of 

 body. 



The larger size, the more complex arabesque- like arrangement of 

 ciliar\- bands, and also the somewhat better developed internal 

 organization of some of my specimens in comparison to the largest 

 observed by CHUN, may be taken for an indication that the former 

 represent an older developmental stage than the latter. 



It is perhaps worth pointing out that while CHUN obtained his 

 specimens in successively progressing stages from January to March, 

 in Misaki the large specimens above referred to occurred together 

 with smaller ones in the months of December and January. 



Tokyo, Feb. 1, [911. 



