282 



SUB-CLASS: PHYTOMASTIGINA 



1. SUB-CLASS: Phytomastigina Doflein, 1916. 



The majority of flagellates belonging to this sub-class are free-living 



organisms. Certain Euglenoidida of the genus Copromonas commonly 



occur in stale faeces, while others are parasitic in the intestine of tadpoles. 



Copromonas subtilis Dobell, 1908. — ^This organism, for which Dobell 



19086) established the genus, has an elongate body covered by a rigid 



Fig. 133. — Copromonas subtilis : A Coprozoic Flagellate from F^ces 

 (1-6, X 2,600; 7-16, x 4,000). (Original.) 



1-2. Typical flagellates. 3-6. Stages in division. 



7-15. Successive stages in division of nucleus. The decolorized karyosome appears to have a 

 central granule which divides. The two halves remain connected by a fibre. 

 16. Connecting fibre of two halves of dividing central granule. 



periplast. It is ovoid in outline and distinctly flattened, and possesses 

 a cytostome leading to a long, narrow oesophagus. There is a single 

 flagellum, which arises from the wall of the oesophagus. The nucleus is 

 central in position, while a blepharoplast lies anterior to it. It is possible 



