60 SOME MINUTE ANIMAL PARASITES 



monas, in every way resembling H. jaculum, pediculi, 

 lygcei, culicis, and vespa, and others with which we 

 are well acquainted. Some of the plants invaded 

 by this parasite are said to be killed by it ; on others 

 it appears to exercise no harmful influence. It is 

 spread from plant to plant by small plant-bugs, in 

 whose bodies it remains apparently unchanged for a 

 considerable time. 



Certain parasitic flagellates known as Trypano- 

 blasma occur in fishes, in snails, and in the flat- 



FIG. 16 TRYPANOPLASMA DENDROCCELI, FROM DENDROCCELUM 

 LACTEUM : FLAGELLATE FORM 



., Nucleus; bl., blepharoplast ; w., membrane; b.g., basal 

 granules 



worms known as Dendroccels. They are remarkable 

 flagellates (Fig/ 16), bearing two flagella, one free 

 anteriorly and the other lateral, forming the edge 

 of the undulating membrane (Fig. 16, m.). The 

 organism has an elongate body. The nucleus is 

 relatively large (Fig. 16, n.), and the blepharoplast 

 (Fig. 1 6, bl.) is most conspicuous, not only on 

 account of its size, but also because of its curved, 

 bowed, or kidney-like appearance. Division occurs 

 as in Trypanosoma, but the splitting of both flagella 

 occurs simultaneously, following the division of the 



