768 



PROTOZOOLOGY 



0. pyriformis Rosso limo (Fig. 326, l). Flask-shape; 240-300^ long; 

 in the gastro vascular cavity of various Turbellaria. 



0. intestinalis R. (Fig. 326, ra). Up to 1.5 mm. by 450-500/*; small- 

 est 60m long; in the gastro vascular cavity of Dicotylus sp. 



0. atra Lieberkuhn. Oval, posterior end broadly rounded; 300- 

 500/x long; grayish; filled with globules; cytostome near anterior end; 

 macro nucleus elongated; a contractile vacuole; trichocysts; stagnant 

 fresh water. 



Genus Deltopylum Faure-Fremiet and Mugard. Cylindrical; uni- 

 form ciliation on about 70 ciliary rows; a triangular cytostome in the 

 anterior fourth, with a paroral undulating membrane on right and 

 three adoral membranes; a contractile vacuole on mid-right side, a 

 pore being located in a depression of pellicle above it; macronucleus 



Fig. 327. a, Deltopylum rhabdoides, X665 (Faur6-Frenriet and Mugard); 

 b, Pleuronema crassum, X240 (Kahl); c, P. anodontae, X290 (Kahl); d, e, 

 P. setigerum, X540 (Noland); f, P. coronatum, X540 (Noland); g, P. 

 marinum, X400 (Noland); h, Cyclidium litomesum, X300 (Stokes); i. 

 Cristigera phoenix, X500 (Penard); j, C. media, X400 (Ka,hl), 



