PERITRICHA 857 



C. polypinum (Linnaeus)' (Fig. 364, a). 100-125m long; colony up 

 to 3 mm. long; fresh water. 



C. granulatum Kellicott (Fig. 364, b). About 100,u long; 2 con- 

 tractile vacuoles anterior; on Cambarus and aquatic plants. 



Genus Zoothamnium Bory. Similar to Carchesium; but myonemes 

 (Fig. 15) of all stalks of a colony are continuous with one another, so 

 that the entire colony contracts or expands simultaneously; fresh 

 or salt water; colonies sometimes several millimeters high. Numerous 

 species (Kahl, 1935; Nenninger, 1948). Development (Summers, 

 1938, 1938a). 



Z. arbuscula Ehrenberg (Fig. 364, c). 40-60/z long; colony up to 

 more than 6 mm. high; fresh water. Morphology and life cycle 

 (Furssenko, 1929). 



Z. adamsi Stokes (Fig. 364, d). About 60/z long; colony about 250/* 

 high; attached to Cladophora. 



Tribe 2 Loricata Kahl 



Peristomal margin not connected with lorica; body attached only at 

 posterior end, and extends, out of lorica . . Family 1 Vaginicolidae 



Peristomal margin connected with inner margin of aperture of lorica; 



stalked disk only extends out of lorica 



Family 2 Lagenophryidae (p. 691) 



Family 1 Vaginicolidae Kent 



Genus Vaginicola Lamarck. Lorica without stalk, attached to 

 substratum directly with its posterior end ; body elongate and cylin- 

 drical; fresh or salt water. Numerous species (Swarczewsky, 1930). 



V. leptosoma Stokes (Fig. 365, a). Lorica about 160/* high; when 

 extended, about 1/3 of body protruding; on algae in pond water. 



V. annulata S. (Fig. 365, b). Lorica about 120/i high; below middle, 

 a ring-like elevation; anterior 1/3 of body protruding, when ex- 

 tended; pond water. 



Genus Cothurnia Ehrenberg. Similar to Vaginicola; but lorica 

 stands on a short stalk; fresh or salt water. Numerous species 

 (Swarczewsky, 1930). 



C. canthocampti Stokes (Fig. 365, c). Lorica about 80/* high; on 

 Canthocamptus minutus. 



C. annulata S. (Fig. 365, d). Lorica about 55/t high; fresh water. 



Genus Thuricola Kent. Body and lorica as in Vaginicola; but 

 lorica with a simple or complex valve-like apparatus which closes 

 obliquely after the manner of a door when protoplasmic body con- 

 tracts; salt or fresh water. 



