INFUSORIA 51 



Key to the genera of Enchelinidae here described: 



cti Cilia cover whole body. 

 &! Body not covered with rectangular plates. 

 Cj Body not elongate and contractile. 

 di Gullet absent or short. 

 d Posterior bristle not present. 



/! Mouth terminal ; body ovoid 1. HOLOPHEYA 



/ 2 Mouth subterminal ; body with slight neck 2. ENCHELYS 



e z Posterior bristle present 3. UBOTBICHA 



d 2 Gullet long and lined with a membrane 4. PBOBODON 



c 2 Body elongate and contractile. 



d x Body flask-shaped with contractile neck 5. LACBYMABIA 



d 2 Body very long and contractile 7. TBACHELOCEBCA 



6 2 Body covered with rectangular plates 6. COLEPS 



a 2 Cilia confined to 1 or 2 girdles. 



&! Deep equatorial furrow present 8. MESODINIUM 



& 2 No such furrow 9. DIDINIUM 



1. HOLOPHRYA Ehrenberg. Body striated, cylindrical or ovoid; 

 ciliation uniform ; no trichocysts : 6 species ; in fresh and salt water. 



Fig. 72 Fig. 73 Fig. 74 



Fig. 72 Holophrya discolor (from Bronn). Fig. 73 EncJielys pupa (Conn). 

 Fig. 74 Urotricha fareta (Conn). 



H. discolor Ehr. (Fig. 72). Body ovoid; length .04 mm.: in standing 

 water. 



2. ENCHELYS 0. F. Miiller. Anterior end somewhat elongated and 

 truncated with subterminal mouth: 5 species; in fresh and salt water. 



E. pupa Ehrenberg (Fig. 73). Body ovoid; length .08 mm.; color 

 often greenish. 



3. UROTRICHA Claparede and Lachmann. Like Holophrya, but with 

 a bristle at hinder end: 2 species; in fresh water. 



U. fareta Cl. and Lach. (Fig. 74). Springs with its bristle; length 

 .02 mm. 



4. PRORODON Ehrenberg. Body ovate or ellipsoid, with a long 

 gullet lined by a membrane: 8 species; in fresh water. 



P. griseus Claparede and Lachmann. Length .25 mm.: in standing 

 water. 



5. LACRYMARIA Ehrenberg. Body flask-shaped, with a contractile 

 neck and spiral striations : 4 species ; in fresh and salt water. 



