284 



s. ISHII : 



growing posterior part of the body into the intestinal lumen and finally 

 remaining attached to the intestinal wall by the anterior end or the 

 epimerite. Contrarily, in the present case, the fully grown intracellular 

 gregarines seem to fall out anterior end first into the intestinal canal, 

 retaining after their complete exit no connection whatever with the 

 epithelium. 



The intracellular gregarine lodged in the- clear space already 

 mentioned, is, according to my view, not totally motionless as has 

 generally been belived to be in other cases. The movements probably 

 become more and more active as the development progresses, and to 

 this cause is probably to be ascribed in a large measure the breaking 

 up of the host-cell. As is well known, free gregarines are mobile, and 

 there exists no ground to deny the same power to the parasite while 

 confined in the epithelial cell. Movements of intracellular parasitic 

 protozoans have been observed in several cases, f.i., in malarial Plas- 

 modia (especially active in Plasmodium immaculatuvi of febris aestivo- 

 autumnalis) ; also in the interesting Eug/ena-like flagekate parasitic in 

 a mesostcmid rhabdocoel recently reported by HasWELL. 1 



I have found, as CRAWLEY 3 and LÉGER and DUBOSCQ 3 did in 

 various Stcnophora, many intracellular young individuals of Stenophora 

 julipusilli in the intestinal epithelium of Juins. I believe that many 

 more instances of intracellular gregarines will in the future be brought 

 to light. 



In conclusion, I should take this opportunity of performing my 

 pleasant duty of thanking Professor Ijima for his advices and instruc- 

 tions given me during the course of this study. 



Tokyo, May 1910. 



1) Haswell, W.A., '07.— Parasitic Euglenae : Zool. Anz., 31. 



2) Crawky, H., '03. — List of polycystic! grtgaiincs of tie United States: Proc. Acad 

 Nat Sci. Philad., 55. 



3) I.cc cit. 



