582 PROTOZOOLOGY 



minal, with a long canal; 300-400^ long, up to 700m (Penard); feeds 

 mainly on rotifers ; fresh water. 



L. setigerum Quennerstedt (Fig. 276, e). 100-350/x long; average 

 150/x by 60/i; form variable; 1-4 macronuclei; several contractile 

 vacuoles in a row; salt and brackish water. 



Genus Bryophyllum Kahl. Similar to Loxophyllum; but uniformly 

 ciliated on both broad surfaces; ventral ridge with closely arranged 

 trichocysts, extends to the posterior extremity and ends there or 

 may continue on to the opposite side for some distance; macro nu- 

 cleus ovoid to coiled bandform; in mosses. 



B. vorax (Stokes) (Fig. 276, /). Elongate; tricho cyst-bearing ven- 

 tral ridge turns up a little on dorsal side; contractile vacuole pos- 

 terior; macronucleus oval; 130/i long; in fresh water among sphag- 

 num and mosses. 



Genus Kentrophoros Sauerbrey. Extremely elongate, nematode- 

 like; anterior end greatly attenuated; posterior end pointed; body 

 surface longitudinally striated; ciliation uniform; 1-3 macronuclei; 

 numerous contractile vacuoles in 2 rows; cytostome not observed. 



K. fasciolaium S. (Fig. 276, g, h). About 270m by 38m. Noland 

 (1937) observed 2 specimens in sediment taken from sandy bottom in 

 Florida; contracted 650m long; extended 1 mm. long. 



Family 2 Tracheliidae Kent 



Genus Trachelius Schrank. Oval to spherical; anterior end drawn 

 out into a relatively short finger-like process or a snout; posterior 

 end rounded; round cytostome at base of neck; cyto pharynx with 

 trichites; contractile vacuoles many; macronucleus simple or band- 

 form; fresh water. 



T. ovum Ehrenberg (Fig. 277, a). Spheroidal to ellipsoid; right side 

 flattened and with a longitudinal groove; left side convex; proboscis 

 about 1/4-1/2 the body length; cilia short and closely set; numerous 

 contractile vacuoles; macronucleus short sausage-form, often di- 

 vided into spherules; endoplasm penetrated by branching cytoplas- 

 mic skeins or bands and often with numerous small brown excretion 

 granules; 200-400m long; fresh water. 



Genus Dileptus Dujardin. Elongate; snout or neck-like prolonga- 

 tion conspicuous; somewhat bent dorsally; along convex ventral side 

 of neck many rows of trichocysts; a row of strong cilia; dorsal surface 

 with 3 rows of short bristles; cytostome surrounded by a ring; cyto- 

 pharynx with long trichocysts; posterior end drawn out into a tail; 

 contractile vacuoles, 2 or more; body ciliation uniform; macro nu- 



