62 PROTOZOA 



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

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

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

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



Fig. 108 



Fig. 109 



Fig. 110 



Fig. lOSStichotricha secunda (Conn). Fig. 109 Amphisia kessleri (Calkins). 

 Fig. 110 Uroleptus longicaudatus (Conn). 



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

 length .13 mm.: marine; Woods Hole. 



5. UROLEPTTTS 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. ONYCHODROMTTS Stein. Body broad, somewhat 

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

 large cilia along the oral groove: 1 species. 



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

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



7. HOLOSTICHA Wrzesniowski. Like Oxytricha 

 except that there 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 



Onychodromus 



grandis 

 (from Bronn). 



