382 BIOLOGY OF THE PROTOZOA 



2. pi. si had on (Fig. lOG, p. 379), flattened; mouth near posterior 



end of the body. 



3. Chlamydodon, flattened with hyaHne hand running aroiuid 



the margin. 



4. Orthodon (Fig. 83, p. 158), flattened with mouth on right 



side of anterior angle. 



5. Chilodnn (Fig. 106, p. 225), flattened with mouth near center 



of right side. 

 (). Trichopiis, with a cihated brush as a caudal appendage. 



7. Di/steria, with spine-like process and narrow ventral surface. 



8. Pha.srolodo)!, with spine-like process and broad ventral 



surface. 



9. /Egyria, with spine; uniform cilia on ventral surface. 



10. Scnphidiodon, with spine; dorsal ridge or keel prominent; 



ventral bands. 



11. Twchilid, with spine; ventral cilia in bands; no dorsal keel. 

 Family 4. Nicollellidse. — Parasitic forms of African rodents. 



Sub-order 3. Trichostomina. Butschli. 



In these forms the mouth is permanentlx' open and provided with 

 one or more undulating membranes which run into the gullet or 

 border the mouth. The majority are free-living but some are para- 

 sitic. The cilia are rarely reduced but usually cover the body. In 

 the genus Urocentrum, however, they are limited to a zone in the 

 anterior half and a larger broader zone in the posterior half. A 

 well-marked peristomial depression is frequent, and a spiral twisting 

 of the body characteristic. The undulating membranes are narrow 

 and inconspicuous for the most part ])ut in some cases form great 

 balloon-like sails used apparently, for the trapping of food (Plevro- 

 nema, Leutbadion Fig. 169, p. 385), Pleurocoptes, etc.). 



Six families are recognized, one, however, consists of the single 

 genus Urocentnon (Urocentrida", Fig. 168, D). The others, with 

 their topical genera are: 



Family 2. Chiliferidae, Butschli. — Here the body is luiiformly cili- 

 ated and has no peristomial furrow. The mouth is in the anterior 

 half of the body which may be flattened, ovoidal, ellipsoidal, cigar- 

 shape or kidney-shape. The genera are: 



1. Lcucophrys, mouth the entire anterior end, bod\' flattened; 



flask-shape. 



2. Glaucoma (Fig. 168, E), ellipsoidal; mouth triangular; two 



oral membranes. 



3. Ojjhryogh'na (Fig. 168, J), ellipsoidal; mouth circular or cres- 



centic, subterminal. 



4. Dallasia (Fig. 168, B), cigar-shape; mouth subterminal. 



