368 HANDBOOK OF PROTOZOOLOGY 



Lemhadion hullinum Perty (Fig. 158, c). About 100 to 150 

 microns long. Fresh water. 



Genus Lembus Cohn. Body rather small; elongated and 

 flexible. Peristome narrow and possesses one or two (?) mem- 

 branes. There are one or more long caudal filaments. Marine. 



Lembus pusillus Quennerstedt (Fig. 158, d). About 26 to 

 30 microns long. In marine infusion. 



Lembus infusionum Calkins (Fig. 158, e). 70 to 75 microns 

 long by 10 to 12 microns wide. Marine. 



Genus Pleurocoptes Wallengren. Body ovoid. Dorsal side 

 hemi-spherical, ventral side flattened or concave. Peristome 

 large; cytostome near one-third from the posterior end; cyto- 

 pharynx indistinct. Longer cilia along peristome. Macronucleus 

 spherical; several micronuclei. A contractile vacuole posterior. 

 Ectoparasitic on Hydractinia. 



Pleurocoptes hydractiniae Wallengren (Fig. 158, /). Body 

 measures 60 to 70 microns long. On Hydractinia echinata. 



Genus Calyptotricha Phillips. Resembles Pleuronema, but 

 dwelling in a lorica which is opened on both ends. The body 

 is actively motile. Fresh water. 



Calyptotricha inhaesa (Kellicott) (Fig. 158, g, h). In swamp 

 water. Attached laterally to filamentous algae. Lorica 180 to 

 210 microns long; body about 30 microns long. 



Family 6 Isotrichidae Schouteden 



The majority of the members of this family live in the mid- 

 gut of ruminants and are covered by a thick pellicle. Ciliation 

 uniform and thick. 



Genus Isotricha Stein. Body ovoid. Ciliation heavy and 

 uniform. Cytostome is either at the anterior end or somewhat 

 toward one side. Oblong macronucleus nearer the anterior end, 

 with a micronucleus. Contractile vacuoles numerous. Cytopyge 

 is usually noticeable at the posterior extremity. Two species in 

 the stomach of cattie and sheep. 



Isotricha prostoma Stein (Fig. 159, a). 80 to 200 microns 

 long. 



Isotricha intestinalis Stein (Fig. 159, b). 97 to 130 microns 

 long. 



