HOLOTRICHA 717 



at base of the flagellum; cytopharynx spindle-form with trichites; 2 

 contractile vacuoles and cytopyge posterior; ovoid macronucleus; 

 movement slow creeping; about 120/* long; fresh water among algae. 



I. ciliata (Roux) (Fig. 306, c). 75/* by 14/*; fresh water. 



Genus Trachelocerca Ehrenberg. Elongate, vermiform or flask- 

 shaped; more or less extensible, with drawn-out anterior end; with- 

 out any ring-furrow which marks the 'head' of Lacrymaria, and when 

 contracted pellicular striae not spiral and no neck as is the case with 

 Chaenea; salt water. Many species. 



T. phoenicopterus Cohn (Fig. 306, d, e). Elongate; extensible and 

 contractile; neck and tail distinct when contracted; cytostome at 

 anterior end, surrounded by a ridge containing indistinctly visible 

 short trichocysts, cytopharynx with trichocysts; macronuclei made 

 up of 4 radially arranged endosomes suspended in the nucleoplasm 

 (Gruber, Kahl); micronucleus difficult to make out; contractile 

 vacuoles apparently in a row, rarely seen; salt water; Woods Hole 

 (Calkins). 



T. subviridis Sauerbrey (Fig. 306,/, g). Highly extensible and con- 

 tractile; nucleus contains peculiar crystal-like bodies; size variable; 

 when extended 320-480/* long; salt water. Noland (1937) observed 

 the organism in a salt spring in Florida. 



Family 7 Butschliidae Poche 



This family includes species that inhabit the alimentary canal of 

 mammals; circular cytostome at anterior end, cytopyge usually lo- 

 cated at posterior end; ciliation uniform or in a few zones; with re- 

 fractile concrement vacuole (Fig. 31, d) in anterior portion; one or 

 more contractile vacuoles. 



Genus Butschlia Schuberg. Ovoid, anterior end truncate, posterior 

 end rounded; cytostome at anterior end, surrounded by long cilia; 

 thick ectoplasm at anterior end; macronucleus spherical micronu- 

 cleus(?); concretion vacuole; ciliation uniform; in stomach of cattle. 



B. parva S. (Fig. 307, a). 30-50/* by 20-30/* Conjugation (Dogiel, 

 1928). 



Genus Blepharoprosthium Bundle. Pyriform, anterior half con- 

 tractile, ciliated; caudal cilia; macronucleus reniform; in the caecum 

 and colon of horse. 



B. pirrum B. (Fig. 307, 6). 54-86/* by 34-52/* (Hsiung, 1930a). 



Genus Didesmis Fiorentini. Anterior end neck-like, with large 

 cytostome; anterior and posterior ends ciliated; macronucleus ellip- 

 soid; in the caecum and colon of horse. Species (Hsiung, 1930a). 



