602 



PROTOZOOLOGY 



C. duodenaria Taylor and Furgason. 20-40^ (9-60/i) long; 12 longi- 

 tudinal ciliary rows; 3 postoral rows; 2 long cilia at the posterior 

 end; long cilia project out from the cytostome along its posterior 

 margin, forming a "beard"; a contractile vacuole terminal; macro- 

 nucleus ovoid, with crescentic micro nucleus; division into 2-8 indi- 

 viduals in division cyst; but no division in trophozoite stage; bac- 

 teria-feeder; fresh water. Taylor and Strickland (1939) find that 

 crowding causes encystment. 



Genus Tillina Gruber. Similar to Colpoda in general appearance 

 and stmcture; but cytopharynx a long curved, ciliated tube; in fresh 

 water. 



Fig. 285. a, b. Colpoda cucullus (a, X340; b, oral region) (Kahl); c, C. 

 inflata, X540 (Stokes); d, C. calif ornica, X670 (Kahl); e, f, Tillina 

 magna, XlOO (Bresslau); g, Bresslaua vorax, XlOO (Kahl); h, Bryophrya 

 bavariensis, X280 (Kahl); i, Woodruffia rostrata, Xl90 (Kahl). 



T. magna G. (Fig. 285, e, /). 180-200m long (Gruber); up to 400/i 

 long (Bresslau); macronucleus oval, with 6 micronuclei; contractile 

 vacuole terminal, with 6 long collecting canals; in stagnant water 

 and also coprozoic. 



Genus Bresslaua Kahl. General body form resembles Colpoda; but 

 cytopharynx large and occupies the entire anterior half. 



B. vorax K. (Fig. 285, g). 80-250;u long; in fresh water. 



Genus Bryophrya Kahl. Ovoid to ellipsoid; anterior end more or 

 less bent toward left side; cytostome median, about 1/3 from an- 

 terior end, its right edge continues in horseshoe form around the 

 posterior end and half of the left edge; anterior portion of left edge of 



