618 PROTOZOOLOCY 



H. aesciilacantha Jarocki ot Jacubowska (Fig. 279, h). 30-52;u 

 by 24-40;u; in stagnant water. 



Genus Opisthonecta Faiire-Fremiet. Conical; ends broadly 

 rounded; a ring of long cilia close to aboral end; adoral zone 

 about 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 cytopharynx; fresh water. One species. 



0. henneguyi F.-F. (Fig. 279, c). 148-170^ long. The organisms 

 studied by Lynch and Noble (1931) were infected by endopara- 

 sitic suctorian, Endosphaera engelmanni (p. 638). 



Family 2 Ophrydiidae Kent 



Genus Ophrydium Ehrenberg {Gerda Claparede et Lachmann). 

 Cylindrical with a contractile neck; posterior end pointed or 

 rounded; variable number of individuals in a common mucilagi- 

 nous mass; pellicle usually cross-striated; fresh water. 



0. sessile Kent (Fig. 279, 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. 279,/). About 250At long; highly con- 

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



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. 279, g). About 55-60/i 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. 279, h). lOO/x long; in colon of 

 Clymenella troquata; Woods Hole. 



Genus Glossatella Biitschli. With a large adoral membrane; 

 often attached to fish and amphibian larvae. 



G. tintinnahulum (Kent) (Fig. 280, a). 30-43^ long; attached 

 to epidermis and gills of young Triton. 



Genus Ellobiophrya Chatton et Lwoff. Posterior end drawn 

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



