250 



THE HAEMOFLAGELLATES 



FIG. 31. 



triculi, Keysselitz. So far as those points are concerned, however, 



they agree also with the above-mentioned genus Trypanophis (cf. 



Figs. 30 and 31). Indeed, Leger, in his account of T. intestinalis, 

 commenting on the great resemblance of this 

 parasite to Trypanophis, suggested that the latter 

 form might be included in Trypanophsma. We 

 consider that Trypanophis grobbeni, on account 

 of its curious habitat and somewhat peculiar 

 nature, should certainly be kept distinct. More- 

 over, as regards the intestinal Trypanoplasma- 

 tine forms, the fact that they are most likely 

 not haemal parasites renders it very probable 

 that their life-cycle differs in many ways from 

 that of the blood-Trypanoplasmata (cf. the hypo- 

 thetical stages in evolution outlined above, 

 p. 246). Formerly, we placed " T" inteslinalis 

 in- with Trypanophis on these grounds ; but it seems 

 preferable to consider it as belonging to an 

 ^dependent genus, along with "T." vcntriculi. 



Trypo,nophis) ; in B the As we are averse to the practice of instituting 



kinetonucleus is double. ,. i 



(After an original draw- new genera in a treatise, we do not propose to 



d S0 here ' 



Before leaving this point, it may be noted 

 that, in the case of these Heteromastigine forms, the presence of 

 an undulating membrane and consequent trypaniform appearance 

 does not bear the same relation to a haemal habitat as seems to 

 be the case in the Monadine types. As Doflein has already pointed 

 out, 1 the undulating-membrane, in the Trypanoplasmatine parasites, 

 has doubtless been developed as the result of the contiguity of the 

 trailing flagellum of the Bocjonine type to the side of the body ; 

 a quite different origin from that in the other section. Hence this 

 condition is more or less independent of the habitat of these forms. 

 Genus Trypanosoma, Gruby (principal synonyms : 2 Undulina, 

 Lank., 1871 ; Herpetomonas, Kent, 1880, but only in part, since 

 the type-species is H. muscae-domesticae ; Paramoecioides, Grassi, 

 1881; Haematomonas, Mitrophan., 1883; Trypanomonas, Danil., 

 1885, for young forms). There is no anterior flagellum. The 

 point of insertion of the attached (posterior) flagellum into the 

 body, and, consequently, the commencement of the membrane, may 

 be anywhere in the anterior half of the body, but is usually near 

 the extremity. 3 



1 Die Protozoen als Parasiten und Krankheitserreger (Fischer, Jena, 1901), 

 p. 54. 



2 For remarks on the synonymy of this genus, readers are referred to the writer's 

 previous article (p. 287). 



3 The type-species is T. rotatorium, Mayer, of frogs. At present, unfortunately, 

 this parasite cannot with certainty be included in the above diagnosis, owing to its 



