EUGLENOIDINA 207 



usually twisted with a long caudal prolongation; stigma promi- 

 nent; discoidal paramylon body central; pellicle longitudinally 

 striated. 



P. pyrum (E.) (Fig. 96, c). About 40^1 long; pyriform, with a 

 straight caudal prolongation; pellicle obliquely striated. 



P. triqueter (E.) (Fig. 96, d). 50-55/x by 30-35^; ovate; with a 

 longitudinal ridge; posterior end acuminate; oblique striation 

 distinct; 1-2 paramylon bodies. 



P. anacoelus Stokes (Fig. 96, e). About 42/^ long; oval or round; 

 with flagellum as long as body. 



P. acuminata S. (Fig. 96, /). About 25m long; nearly circular 

 in outline; longitudinally striated; fold long; flagellum as long 

 as body; 2 small paramylon bodies. 



Genus Crumenula Dujardin (LepocincUs Perty). Body more or 

 less ovo-cylindrical; rigid with spirally striated pellicle; often 

 with a short posterior spinous projection; stigma sometimes 

 present; numerous discoidal chromatophores marginal; paramy- 

 lon bodies usually large and ring-shaped, laterally disposed; 

 without pyrenoids; fresh water. Several species. 



C. ova (Ehrenberg) (Fig. 96, g). 20-40^ long; in fresh water 

 with Euglena. 



Genus Trachelomonas Ehrenberg. With a lorica which often 

 possesses numerous spinous projections; sometimes yellowish to 

 dark brown; a single flagellum protrudes from anterior aperture, 

 the rim of which is frequently thickened to form a collar; chroma- 

 tophores either 2 curved plates or numerous discs; paramylon 

 bodies small grains; stigma and pyrenoids; multiplication by 

 longitudinal fission; one daughter individual retains lorica and 

 flagellum, while the other escapes through flagellar aperture, 

 forms a new flagellum and secretes a lorica; cysts common; 

 specific differentiation is based upon the lorica; fresh water. 

 Numerous species. 



T. hispida (Perty) (Figs. 31, a; 96, h). Lorica oval, with numer- 

 ous minute spines; brownish; 8-10 chromatophores; 20-42/i by 

 15-26/x; many varieties. 



T. urceolata Stokes (Fig. 96, i). Lorica vasiform, smooth with 

 a short neck; about 45^ long. 



T. piscatoris (Fisher) (Fig. 96, j). Lorica cylindrical with a 

 short neck and with numerous short, conical spines; 25-40/z long; 

 flagellum 1-2 times body length. 



