62 



PROTOZOA 



4. Amphisia Sterki. Body elongate and cylindrical and contractile, 

 Avitli rounded ends and often tinged red or yellow; several anterior 

 bristles and 5 to 10 anal bristles; oral gTOOve extends back to middle 

 of body : 7 species ; in fresh and salt water. 





lOS 



109 



Fig. 110 



Fig. lOS — Stichotricha secunda (Conn). Fig. 109— Amphisia kessleri (Calkins). 

 Fig. 110 — Uroleptus Jongicaudatus (Conn). 



A. kessleri (Wrzesniowski) (Fig. 109). Body wider anteriorly; 

 length .13 mm.: marine; Woods Hole. 



5. Uroleptus Ehrenberg. Body cylindrical or flattened and slen- 

 der with rounded anterior and acute posterior ends; 3 anterior and 

 no anal bristles; oral groove short; 2 continuous rows of median cilia: 

 5 species; in fresh and salt water. 



U. longicaudatus Stokes (Fig. 110). Length .2 

 mm. : in fresh water. 



6. ONycHODROMTJS Stein. Body broad, somewhat 

 rectangular; 3 or 4 rows of ventral cilia; one row of 

 large cilia along the oral groove: 1 species. 



O. grandis St. (Fig. 111). Length .35 mm.; width 

 .12 mm.: in fresh water; slow of movement. 



7. HoLOSTiCHA Wrzesniowski. Like Oxytricha 

 except that tliere are 2 rows of median cilia and no 

 anterior bristles. 



H. vernalis Stokes. Body elliptical, rounded at 

 both ends; length .07 mm.: in fresh water. 



8. Oxytricha Ehrenberg. Body elliptical, with a 

 row of cilia along each lateral margin and a mid- 

 ventral group of bristles, consisting of about 8 bristles along the oral 

 groove, about 5 in middle of the body, and about 5 anal bristles: several 

 species; in fresh and salt water. 



0. pellionella (0. F. Miiller). Body elongate; length .09 mm.: in 

 fresh water. 



Fig. Ill 



OnijcJiodromuii 



grandis 

 (from Bronn). 



