406 BIOLOGY OF THE PROTOZOA 



Family 2. Chiliferidae, Biitschli. 



1. Mouth terminal 2 



Mouth not terminal 3 



2. Mouth slit-like, entire anterior end . Genus Leucophrys 

 Mouth circular with lateral pocket; cup 



dwelling Genus Cyrtolophosis 



3. With caudal filament or filaments 4 



Without caudal filaments 5 



4. Spiral circlet of longer cilia from mouth 



(Fig. 168) Genus Loxocephalus 



Without spiral row of cilia Genus Uronema 



5. Mouth subterminal; body cigar-shape 



(Fig. 168) Genus Dallasia ■ 



Body ellipsoid, kidney-shape, or bean-shape 6 



6. Body ellipsoid or oval 7 



Body kidney-shape or bean-shape 10 



7. Mouth circular or crescentic (Fig. 168) 



Genus Ophryoglena 

 Mouth oval or ellipsoid 8 



8. With conspicuous pharyngeal basket Genus Clathrostonin 

 Without pharyngeal basket 9 



9. Long groove running posteriorly from 



^ mouth (Fig. 168) Genus Frontonia 



Groove reduced to posterior pocket of 

 mouth Genus Monochllum 



10. Body distinctly kidney-shape 11 



Body bean-shape 14 



11. Mouth more or less triangular; two mem- 



branes (Fig. 168) Genus Glaucoma 



Mouth with single membrane 12 



12. Periplast with distinct striping, plaid-like 



Genus Placus 

 Periplast without cross striping 13 



13. Prominent posterior dorsal, pigmented lobe 



Genus Tillina 

 Without pigmented lobe Genus Colpoda 



14. Peristome a long, narrow, transverse fur- 



row Genus Plagiopyla 



Peristome small 15 



15. Dorsal side arched; mouth anterior . Genus Colpidium 

 Dorsal side flat; mouth and peristome 



central Genus Chasmatostoma 



Family 3. Microthoracidae, Wrzesniowski. 



1. Crescentic or sickle-shape; mouth central 



Genus Drepanomonas 

 Lens shape 2 



2. Posterior end obliquely truncate. . . .Genus Cinetochilum 

 Posterior end not truncate Genus Microthorax 



Family 4. Pleuronemidse, Biitschli. 



1. Cup-dwelling forms 2 



Not cup-dwelling 3 



2. Cup open both ends; one anterior, one pos- 



terior bristle •. . Genus Calyptotricha 



Cup simple ; peristomial lobe with long cilia 



Genus Myderothrix 



