- 46 — 



the intestine of Bkitta: they were afterwards described by 

 Pari si under the name ol Trichomastix orthopterorum. 

 Thus, the occurence of typica] Trichomonas in termites not 

 only confirms the suppositions of Grassi and others, but 

 also justifies (as will be shown in some other forms) the 

 immediate derivation of some species referred to Tricho- 

 n y m p h i d a e from Trichomonads. 



The structure of T. termifis follows the general type for 

 all the Trichomonads. The body is elongated, its length is 

 about ]4 — 18 microns. From the anterior extremity of the 

 body there proceed 4 flagella not quite equal in length. At 

 the same point with them is the beginning of a rather high 

 membrane; it is directed backAvards, forming a semi-circle 

 around the body and terminating in a short free flagellum. 

 At the starting point of the membrane and the 4 anterior 

 flagella there is a distinct basal corpuscle (possibly double). 

 Posteriorly to it is the oval nucleus. The cytostome is absent. 

 The long and riither thick axostyle protrudes out of the body 

 with its posterior extremity. The anterior extremity of the 

 axostyle, according to my observations (especially on another 

 representative of T e t r a m i t i d a e, viz. Myxomonas). surrounds 

 the nucleus (contrary to most investigators of the Trichomo- 

 nads: Lave ran, I) obeli, Paris i, Kucinsky, Kofoid). 



il. Trichomonas (Tetratrichomonasj macrostoma n. sp. 



Is found in the intestine of Hodotermes mossamhicus Hag. 

 The shape of the body is as in the preceding species, but 

 the size is somewhat smaller. The axostyle, flagella, basal 

 body and nucleus are the same. The membrane runs poste- 

 riorly along the body in a straighter direction and its free 

 end is very short, being hardly at all elevated above the 

 body surface. The most sharply distinguishable character of 

 the species is the large and deep cytostome situated on the 

 ventral side of the body, at its anterior end. The posterior 

 margin of the cytostome is much extended ventrally in the 

 form of a lip. 



Preparations for encystmeut are frequently to be observed, 

 in the process of which the animal bends into two on its 

 ventral side, the flagella being cast off (t. 1, fig. 6 and 7). 

 According to DobelTs work (6) on the Trichomonads of 



