690 



OKDER: DIPLOMONADIDA 



pigeon, and Da Ciinlia and Miiniz (1925) H. acuminata and H. elongata 

 from other birds of Brazil. Moore observed a flagellate in large numbers 

 in the intestine of North American trout. She at first regarded it as 

 a species of Giardia, and suggested the name G. salmonis. Later, both 



YiG. 290. — Hexamita ovata of the Amphibian, Diemyctylus torosus, showing 

 Structure and Method of Division (x 2,583). (After Swezy, 1915.) 



1. Normal flagellate, showing two nuclei, blepharoialasts, and axonemes of jiosterior flagella. 



2. Early division stage: each nucleus has apical daughter blepharoplasts connected by a para- 



desmose; new axonemes and posterior flagella have developed; the chromatin is in the form 

 of a spireme. 



3. Later division stage: each nucleus has two groups of two daughter chromosomes; the para- 



desmose is still present. 



4. Still later stage: the daughter nuclei are reconstructed, and the paradesmose has disappeared. 

 r>. stage just prior to division of the body. 6. Multiple division form. 



Moore (1923) and Davis (1923) studied the flagellate in trout {Salvelinus 

 fontinalis and Sahno shasta), and found that it in reality belonged to the 

 genus Hexamita. They concluded that it invaded the intestinal cells, 

 but the figures of the intracellular stages given by Davis are unconvincing. 



