PERITRICHA 685 



1.1 turns, composed of 2 parallel rows; a papilla with about 12 long 

 cilia, just above the opening into vestibule; macronucleus sausage- 

 form; micronucleus; 3 contractile vacuoles connected with cyto- 

 pharynx; fresh water. One species. 



0. henneguyi F.-F. (Fig. 321, c). 148-170^ long. The organisms 

 studied by Ljmch and Noble (1931) were infected by endoparasitic 

 suctorian, Endosphaera engelmanni (p. 705). 



Family 2 Ophrydiidae Kent 



Genus Ophyrdium Ehrenberg (Gerda Claparede and Lachmann) • 

 Cylindrical with a contractile neck ; posterior end pointed or rounded ' 

 variable number of individuals in a common mucilaginous mass' 

 pellicle usually cross-striated; fresh water. 



0. sessile Kent (Fig. 321, d, e). Fully extended body up to 300/i 

 long; colorless or slightly brownish; ovoid colony up to 5 mm. by 3 

 mm. ; attached to freshwater plants. 



0. vernalis (Stokes) (Fig. 321, /). About 250m long; highly con- 

 tractile; in shallow freshwater ponds in early spring (Stokes). 



0. ectatum Mast. 225-400^ long; with numerous zoochlorellae. In 

 a creek near Falmouth, Mass. 



Family 3 Scyphidiidae Kahl 



Genus Scyphidia Dujardin. Cylindrical; posterior end attached 

 to submerged object by an attaching disk; cross-striated; fresh or 

 salt water. 



S. constricta Stokes (Fig. 321, 6^). About 55-60m long; pond water. 



Genus Paravorticella Kahl. Similar to Scyphidia; but posterior 

 portion is much elongated and contractile; salt water, attached or 

 parasitic. 



P. clymenellae (Shumway) (Fig. 321, h). 100m long; in the colon of 

 the annelid, Clymenella iroquata; Woods Hole. 



Genus Glossatella Butschli. With a large adoral membrane; often 

 attached to fish and amphibian larvae. 



G. tintinnahulum (Kent) (Fig. 322, a). 30-43m long; attached to 

 the epidermis and gills of young Triton. 



Genus Ellobiophrya Chatton and Lwoff. Posterior end drawn out 

 into 2 arm-like processes by means of which the organism holds fast 

 to the gill bars of the mussel, Donax vittatus. One species. 



E. donacis C. and L. (Fig. 322, h). 50m by 40m, excluding the proc- 



