PKOWAZEKELLA LACERT^E 



613 



stage there are about sixty-four nuclei present. The cytoplasm still 

 lines the cyst, which has a large central vacuole often traversed by thin 

 strands of cytoplasm. According to Chatton (19176), the cytoplasm then 

 becomes heaped up round each nucleus, flagella are developed, and finally 

 a number of small flagellates having the structure of the free forms are 

 produced (Fig. 253). The cysts are found in large numbers in the hind- 



FiG. 253. — Frowazekella lacertw from the Intestine of the North African 

 Gecko, Tarentola mauritanica, as seen in Living Condition ( x 720), (After 

 Chatton, 1917.) 



1. Free flagellate. 2. Uninucleated cyst. 



3-5. Growth of cyst, multiplication of nuclei and segmentation of contents. 

 G. Cyst containing flagellates. 



gut of lizards, and they are passed in the fgeces. Presumably, when the 

 cysts are eaten by other lizards, the flagellates are liberated in the intestine. 

 The minute structure of the flagellate stage of P. lacertce has 

 been described by Belaf (1921rt). The flagella actually rise from two 

 minute granules, which are at the extreme anterior end of the flagellate 



