764 



PROTOZOOLOGY 



usually 1 (or more) long caudal cilium; endoplasm granulated, yel- 

 lowish to dark brown; macronucleus ovoid; a single contractile 

 vacuole; in fresh or brackish water. Many species. 



L. plagius (Stokes) (Fig. 325,/). 50-65/* long; nearly cylindrical; 

 15-16 ciliary rows; endoplasm usually darkly colored; in fresh water 

 among decaying vegetation. 



Genus Balanonema Kahl. Similar to Loxocephalus; but with plug- 

 like ends; cytostome difficult to see; a caudal cilium; macronucleus 



Fig. 325. a, Espejoia musicola, X300 (Penard); b, Cryptochilidium 

 echini, X380 (Powers); c, Eurychilum actiniae, X360 (Andre); d, Mono- 

 chilum frontatum, X440 (Schewiakofif) ; e, Dichilum cuneiforme, X700 

 (Schewiakoff); f, Loxocephalus plagius, X380 (Stokes); g, Balanonema 

 biceps, X600 (Penard); h, Platynematum sociale, X500 (Kahl); i, Sapro- 

 philus agitatus, X450 (Stokes); j, S. muscorum, X440 (Kahl); k, Cineto- 

 chilum margaritaceum, X440 (Kahl). 



oval; contractile-vacuole; ciliation uniform or broken in the middle 

 zone ; fresh water. 



B. biceps (Penard) (Fig. 325, g). Ellipsoid; no cilia in the middle 

 region; contractile vacuole central; macronucleus posterior to it; 

 42-50ju long. 



Genus Platynematum Kahl. Ovoid or ellipsoid; highly flattened; 

 with a long caudal cilium; contractile vacuole posterior-right; small 



