636 PROTOZOOLOGY 



end with 2 opposing sharp points; lorica 32-42/^ high; on Oedo- 

 gonium in fresh water. 



A. lacustris S. (Fig. 287, i). Lorica elongate ovoid; flattened; 

 75-185/z high; on Anacharis in pond. 



Genus Tokophrya Biitschli. Pyriform or pyramidal; without 

 lorica; tentacles in 1-4 bundles on anterior surface; stalk soft; 

 swarmers oval, with several ciliary bands and long cilia; fresh 

 water. Several species. 



T. infusionum (Stein) (Fig. 288, c-e). Inverted pyramid; stalk 

 with or without attaching disk; macronucleus oval; 2 contractile 

 vacuoles; about 60/x long. 



T. cyclopum (Claparede et Lachmann) (Fig. 288, /). Oval or 

 spherical; stalk short; tentacles in 2-5 bundles; macronucleus 

 spherical; 1-2 contractile vacuoles; about 50/^ long; on Cyclops, 

 etc. 



Genus Thecacineta Collin. Lorica with free margin; body 

 usually attached to bottom of lorica, more or less long; tentacles 

 from anterior end; salt water. Several species. 



T. cothurnioides C. (Fig. 289, a). Lorica about 50/x high; stalk 

 knobbed; on Cletodes longicaudatus. 



T. gracilis (Wailes) (Fig. 289, b). Lorica llO/z by 35m; stalk 

 200^ by ifx] on hydroids. 



Genus Periacineta Collin. Elongate lorica; attached with its 

 drawn-out posterior end; tentacles from the opposite surface in 

 bundles; fresh water. 



P. huckei (Kent) (Fig. 289, c). Attached end of lorica with 

 basal plate; 3 contractile vacuoles; up to 125yu long; on Lymnaea 

 stagnalis and Ranatra linearis. 



Genus Hallezia Sand. Without lorica; with or without a short 

 stalk; tentacles in bundles; fresh water. 



H. hrachypoda (Stokes) (Fig. 289, d). 34-42/i in diameter; in 

 standing water among leaves. 



Genus Solenophrya Claparede et Lachmann. Lorica attached 

 directly with its under side; body usually not filhng lorica; 

 tentacles in bundles; fresh water. 



S. inclusa Stokes (Fig. 289, e). Lorica subspherical; about 44/t 

 in diameter; standing fresh water. 



*S. pera S. (Fig. 289,/). Lorica satchel-form; about 40-45^ high; 

 body about Sd/x long; standing fresh water. 



Genus Acinetopsis Robin. Lorica in close contact with body 



