196 



H. M. WOODCOCK. 



night time/ to become once more atypical Trypanomorpha 

 (e). Aftei' a (short?) period of movement free in the 

 plasma, the parasite again becomes attached, resumes the 

 Halteridium form, and grows until the next night, when 

 the above changes recur. This cycle is repeated for six 

 days, until the full size of the organism is attained (f and 

 G). The adult Trypanosome then undergoes, in the active, 

 trypaniform condition, a number of successive longitudinal 

 divisions, until the resulting daughter-Trypanosomes have 



Fig. 13. — Stages in the growth of an Indifferent Trypanosome 

 in the blood of the owl. n = nucleus of red blood-corpuscles ; 

 p z= young intra-cellular parasite. (After Schaudinn.) 



at length reached a minimum size, whereupon the process of 

 attachment and growth is begun anew. It is important to 

 note that Schaudinn never observed any division of the 

 parasites when in the gregariniforra (Halteridi um) con- 

 dition by multiple fission or schizogony, such as occurs in 

 other Halteridia and Hasmosporidia generally. - 



(2) Microgametocy tes and Microgametes (male 

 forms and male Trypan osomes). — If any little male 

 Trypanosomas from the gnat do succeed in gaining an entry 



' The reason being, Schaudinn thinks, the fall in temperature of the 

 bird, which occurs at this time. 



* As the author remarks, this is probably of later phylogcnetic develop, 

 ment (see below, in Section II). 



