MORPHOLOGY AND TAXONOMY OF THE INFUSORIA 507 



Family 1. Frontoniidae Kahl 1926. 



26. Slightly compressed; mouth depressed; 



above middle of ventral surface 27 



Body dorso-ventrally more or less com- 

 pressed 29 



27. Anterior pole not ciliated ; indistinct turn >w 



from pole to mouth Genus Uronema Dujardin 



Anterior pole ciliated, no trace of furrow. . 28 



28. C. V. terminal; no pocket formed by oral 



membrane ( ienus Dexiotrichides Kahl 



C. V. not terminal: oral membranes form 

 closed pocket ( ienus Uronemopsis Kahl 



29. Body flattened; mouth near right edge; 



form ovoid 30 



Body not flattened, form ellipsoidal 31 



30. Mouth with membranous pocket . .( ienus Saprophihis Stokes 

 Mouth small, kidney-shape; a membrane 



on left concave edge Genus Platynema Kahl 



31. Mouth with anterior and posterior truncate 



processes Genus Balanonema Kahl 



Mouth without such processes 32 



.'!2. Form plump, worm-like; 4 to 5 caudal cilia ; 



mouth small, heart-shaped in anterior 



fifth of body Genus Cardiostoma Kahl 



Not worm-like; anterior pole not ciliated: 



cilia in longitudinal or oblique cross 



rows; mouth with groove from right 



(Fig. 205) Genus Loxocephalus Eberhard 



33. Broad oval; ventrally flat and ciliated; 



dorsal slightly flat or arched without 



cilia Genus Cinetochilum Perty 



Spindle-shape; not flattened: ciliated on 

 both sides 34 



34. Very small salt water f< inns ; dancing move- 



ment without pause Genus Uropedalium Kahl 



Very small moss forms; gliding movement 



< Ienus Homologastra Kahl 

 Family 2. Ophryoglenidae Kent 1882; em. Kahl 1931. 



Only one genus — Ophryoglena Ehr. (Fig. 205) 

 Family 3. Philasteridae Kahl 1931. 



1. Peristome with long rows of cilia; always a 



tail filament, ectoplasm soft, with tricho- 



cysts 2 



Peristome ciliated only on right edge; ecto- 

 plasmic resistant heavy membrane on 

 right edge Genus Lemboides Kahl 



2. Pocket from end to mouth, with small tri- 



angular membrane, nucleus oval 3 



Pocket winds spirally around oral pits; 



nucleus elongate Genus Helicostoma Cohn 



3. Large marine forms with terminal contrac- 



tile vacuoles Genus Philaster Fabre-Dom. 



Small; fresh water; contractile vacuole 



near center Genus Philasterides Kahl 



Here also Genus Anophrys Cohn 1866 — not confirmed 



