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MANUAL OF ELEMENTARY ZOOLOGY 



body is known as the kinetonucleus, and has been supposed 

 to have some function in connection with movement, while 

 the nucleus proper, known as the trophonucleus, regulates 

 the other functions of the body. 



The existence of two nuclei in the body of a protozoon is known 

 as binuclearity. It will be recalled that a kind of binuclearity, 

 in which the nuclei are not trophic and kinetic but somatic and 

 generative, occurs in the Ciliata. Another kind, in which, so far as is 

 known, there is no difference of function between the nuclei, is found 

 in other cases, as, for instance, in the Amaba-Wke organism Pelomyxa 

 binucleata. 



Fig. 91. — Trypanosoma gambiense. — After various authors. 



A, B, C, Slender, intermediate, and stumpy forms from man J D, latent body; 

 E, slender form from gut of fly ; F, crithidial form from salivary gland of fly ; 

 G, ripe form from proboscis of fly. 



k. nu. , kinetonucleus ; tr. mm., trophonucleus ; 



bj>t. t blepharoplast;^., nagellum; 

 u. 111., undulating membranes. 



Trypanosoma has no mouth, but nourishes itself, like 

 Monocystis, by absorbing through the surface of its body 

 substances obtained from the juices of its host. 



In spite of the immense amount of investigation of 

 which its medical importance has caused it to be the 

 subject, the life-history of Trypanosoma is not yet thoroughly 



