852 PROTOZOOLOGY 



form; micronucleus; 3 contractile vacuoles connected with cyto- 

 pharynx; fresh water. One species. 



0. henneguyi F.-F. (Fig. 361, c, d). 148-170m long; cysts about 57/z 

 in diameter; sometimes infected by a parasitic suctorian, Endo- 

 sphaera engelmanni (Lynch and Noble, 1931) (p. 873). Conjugation 

 (Rosenberg, 1940); neuromotor system (Kofoid and Rosenberg, 

 1940); encystment (Rosenberg, 1938). 



Family 2 Ophrydiidae Kent 



Genus Ophrydium 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. 361, e). Fully extended body up to 300/z 

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

 mm. ; attached to freshwater plants. 



0. vernalis (Stokes) (Fig. 361, /). About 250/x long; highly con- 

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



0. ectatum Mast (Fig. 361, g). 225-400 /j, long; with many zoochlor- 

 ellae; colony up to 3 mm. in diameter; in fresh water (Mast, 1944). 



Family 3 Scyphidiidae Kahl 



Genus Scyphidia Dujardin. Cylindrical; posterior end attached to 

 submerged objects or aquatic animals; body usually cross-striated; 

 fresh or salt water. Species (Nenninger, 1948). 



S. amphibiarum Nenninger (Fig. 361, h). On tadpoles; about 76/z 

 long. 



Genus Paravorticella Kahl. Similar to Scyphidia; but posterior 

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

 parasitic. 



P. clymenellae (Shumway) (Fig. 361, i). 100/i long; in the colon of 

 the annelid, Clymenella torquata; Woods Hole. 



Genus Glossatella Butschli. With a large adoral membrane; often 

 attached to fish and amphibian larvae. 



G. tintinnabulum (Kent) (Fig. 362, a). 30-43/x long; attached to 

 the epidermis and gills of young Triton. 



Genus Ellobiophrya Chatton and LwofT. 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. 362, b). 50^ by 40/z, excluding the proc- 



