PERITRICHA 691 



Genus Cothumia Ehrenberg. Similar to Vaginicola; but lorica 

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



C. canthocampti Stokes (Fig. 325, c). Lorica about 80/i high; on 

 Canthocamptus minutus. 



C. annulata S. (Fig. 325, d). Lorica about 55ai 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. 



T. folliculata (Mliller) (Fig. 325, e). Lorica 127-170^ high (Kent) ; 

 160-200/i high (Kahl) ; salt and fresh water. 



Genus Thuricolopsis Stokes. Lorcia with an internal, narrow, 

 flexible valve-rest, adherent to lorica wall and projecting across 

 cavity to receive and support the descended valve; protoplasmic 

 body attached to lorica by a pedicel; on freshwater plants. 



T. kellicottiana S. (Fig. 325,/). Lorica about 220iu long. 



Genus Caulicola Stokes. Similar to Thuricola; but lorica-lid at- 

 tached to aperture; fresh or brackish water. 2 species. 



C. valvata S. (Fig. 325, g). Lorica about 50^ high; stalk about 1/2; 

 body protrudes about 1/3 when extended; brackish water. 



Genus Pyxicola Kent. Body attached posteriorly to a corneous 

 lorica; lorica colorless to brown, erect, on a pedicel; a discoidal 

 corneous operculum developed beneath border of peristome, which 

 closes lorica when organism contracts; fresh or salt water. Many 

 species. 



P. affinis K. (Fig. 325, h, i). Lorica about 85/1 long; in marsh 

 water. 



P. socialis (Gruber) (Fig. 325, j). Lorica about 100/x long; often in 

 groups; salt water. 



Genus Platycola Kent. Body similar to that of Vaginicola; but 

 lorica always decumbent and attached throughout one side to its 

 fulcrum of support; fresh or salt water. Many species. 



P. longicollis K. (Fig. 325, k). Lorica yellow to brown when older; 

 about 126/x long; fresh water. 



Family 2 Lagenophryidae Biitschli 



Genus Lagenophrys Stein. Lorica with flattened adhering surface, 

 short neck and convex surface; "striped body" connects body with 

 lorica near aperture; attached to fresh or salt water animals. Many 

 species. 



