40 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



2. Without shell 3 



With sculptured shell made of numerous pieces: 



ellipsoidal Coleps* 



3. Cilia uniform over body i 4 



One or two bands of cilia 25 



Cilia only on ventral surface 26 



4. With delicate, uniform cilia only 5 



With tentacle-like processes among the cilia 



Actinoholus 



5. Mouth without protruding undulating membrane. . 6 



Mouth with protruding undulating membrane 18 



Mouth wanting Anoplophrya* 



6. Mouth terminal or nearly so ; no proboscis 7 



Mouth somewhat posterior to anterior end, on the 



ventral surface; sometimes with a proboscis 10 



7. No evident pharynx 8 



With more or less evident pharynx 9 



8. Ellipsoidal to ovate Holophrya* 



Like the above, but with a posterior bristle. . . Urotricha* 



Elongated, cylindrical Chcenia*^ 



Elongated, anterior end oblique, neck-like .... Enchelys* 

 Like the above, but with neck shorter and flattened . . 



Spathidiiim* 

 Short, purse shaped ; mouth covering the whole ob- 

 lique anterior end Leticophrys 



9. With a long neck, not much flattened, not contractile 



Nczu genus 



With a long neck, much flattened TrachelopJiyllnm* 



With a long neck, not flattened, sometimes telescopic 



and highly contractile Lacrymaria* 



Without a neck; body spherical to ovate; pharynx 



long and evident Prorodon* 



10. With proboscis in front of mouth, very flexible 11 



Without proboscis 14 



11. Mouth always open, pharynx rod-like 12 



Mouth commonly closed, no pharynx 13 



12. Spherical to ovate, proboscis short, slightly flexible. . 



Tracheliiis* 

 Long, band-formed, long proboscis, very flexible. . . . 



Dileptus* 



