PERITRICHA 623 



C. granulatum Kellicott (Fig. 282, h). About 100^ long; 2 con- 

 tractile vacuoles anterior; on Cambarus and aquatic plants; 

 Niagara river, N. Y. 



Genus Zoothamnium Bory. Similar to Carchesiiim; but 

 myonemes (Fig. 15) of all stalks of a colony are continuous with 

 one another, so that the entire colony contracts or expands simul- 

 taneously; fresh or salt water; colonies sometimes several milli- 

 meters high. Numerous species. 



Z. arhuscula Ehrenberg (Fig. 282, c). 40-60;U long; colony up 

 to more than 6 mm. high; fresh water. 



Z. adamsi Stokes (Fig. 282, d). About 60/i long; colony about 

 250m high; attached to Cladophora; Niagara river, N. Y. 



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 extends out of lorica only 



Family 2 Lagenophryidae fp. 625) 



Family 1 Vaginicolidae Kent 



Genus Vaginicola Lamarck. Lorica without stalk, attached to 

 substratum directly with its posterior end; body elongate and 

 cyHndrical; fresh or salt water. Numerous species. 



V. leptostoma Stokes (Fig. 283, a). Lorica about 160/x high; 

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

 water. 



V. annulata S. (Fig. 283, h). Lorica about 120At high; below 

 middle, a ring-Hke elevation; anterior 1/3 of body protruding, 

 when extended; pond water. 



Genus Cothurnia Ehrenberg. Similar to Vaginicola; but lorica 

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



C. canthocampti Stokes (Fig. 283, c). Lorica about 80m high; 

 on Canthocamptus minutiis. 



C. annulata S. (Fig. 283, d). Lorica about 55m 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 contracts; salt or fresh water. 



