614 



FAMILY: PROWAZEKELLID^ 



microns 



Fig. 254. — Trowazelcella lacertce from the Intestine of the Lizard {Laeerta agilis) 

 ( X 1,250). (After Wenyon, 1921; from Parasitology, vol. xii.) 

 a-h. Various types of flagellate. In some the backwardly directed flagellum is attached to the 



surface of the body for a short distance. 

 n-s. Probable stages in sjngamy and encystment. 

 t-y. First nuclear division in zygote and formation of vacuole. 

 m, I, i. Growth of cyst and multiplication of nuclei. 

 /, k. Stages corresponding with those at o and f. 



