THE EUGLENOIDINA OF OHIO 385 



4. Gen. CRYPTOGLENA Ehrenberg. 



Form oval, short, scarcely acute posteriorly, compressed, free 

 swimming, with ventral longitudinal furrow; a single flagellum; 

 pellicula thick as in Phacus ; chloroleucites in the form of two 

 elongate bands. 



Distribution, cosmopolitan. 



A single species in the genus. 



*1. C. pigra Ehrenb. (Fig. 1, PI. XVIII). 



Body oval, rigid, flattened, slightly pointed behind ; a single 

 flagellum inserted at the bottom of a slight depression equivalent 

 to the cytopharynx of Euglena, etc.; nucleus posterior; two elon- 

 gate chloroleucites situated one on each side and extending nearly 

 the entire length of the body ; stigma in contact with anterior end 

 of one of the chromatophores ; vacuole present. 



Reproduction ( ?). 



L. 11-15/.. D. 6-7/t. 



Distribution, cosmopolitan. 



Landacre notes the species from Sandusky Bay in decaying 

 vegetation of Biemiller's Cove under the name Chloromonas pigra 

 in accordance with Kent. 



5. Gen. TRACHELOMONAS Ehrenberg. 



Free swimming forms having a single flagellum and normally 

 provided with a protective shell of a brownish color. The indi- 

 viduals frequenting the shells are colored green by the chloro- 

 leucites contained in the protoplasm and are provided with a 

 stigma, paramylon granules and other structures characteristic 

 of the family Euglenidae. Reproduction through division inside 

 of the shell, the new individual leaving and forming a new shell. 



Distribution, cosmopolitan. 



The species inhabit fresh water in ditches, pools, and ponds, 

 particularly in stagnant waters where rusty patches of "ooze" are 

 observable. 



TABLE OF SPECIES. 



A' Surface of shell not provided with distinct spines. 



Bi Posterior end of shell not produced into a spine- 

 like process. 



C Form approximately spherical or slig-htly 

 oval, but never decidedly longer than wide. 



