342 Ciliophora 



laterally compressed, slightly or extensively in different genera. The slit- 

 like cytostome lies on the typically convex "ventral" surface and is usually 

 bordered by a zone of trichocysts. Ciliation may be uniform or may be 

 reduced or lacking on one surface (Fig. 7. 2, C). There are usually two 

 or more macronuclei. Carnivorous habits are characteristic, other ciliates 

 and rotifers being common prey of various Amphileptidae. 



The family includes the following genera: Ampliileptits Ehrbg. (102; Fig. 7. 2, D), 

 Bryophylliim Kahl (102; Fig. 7. 2, L), Centrophorella Kahl (106, 158; Fig. 7. 2, H), 

 Lionotus Wrzesniowsky (102, 165; Fig. 7. 2, C, E), Loxophyllum Dujardin (102, 165, 

 167; Fig. 7. 2, F, G). 



Family 4. Butsdiliidae. These ciliates occur in the digestive tract of 

 such herbivores as horses and camels. The body is more or less ovoid or 

 pear-shaped, with the cytostome usually at the anterior end. An anterior 

 concretion-vacuole (Fig. 7. 3, I-L) — which has been considered a statocyst 

 (52) — and one or more contractile vacuoles are characteristic. A posterior 

 cytopyge is typical. The cilia may be uniformly distributed or else re- 

 stricted to certain areas. In fission, the concretion-vacuole is retained by 

 the anterior daughter and a new organelle is developed by the posterior 

 one. 



Hsiung (91) has published a key to most of the following genera: Alloiozona Hsiung 

 (91; Fig. 7. 3, P), AmpuUaciila Hsiung (91; Fig. 7. 3, C), Blepharoconus Gassovsky (91; 

 Fig. 7. 3, G), Blepharoprosthium Bundle (91; Fig. 7. 3, E), Blepharosphaera Bundle 

 (91; Fig. 7. 3, O), Blepharozoum Gassovsky (91), Bundleia da Cunha and Mimiz (91; 

 Fig. 7. 3, A), BiUschlia Schuberg (51; Fig. 7. 3, H). Didesmis Fiorentini (91; Fig. 7. 3, 

 D), Holophryoides Gassovsky (91), Paraisotrichopsis Gassovsky (91; Fig. 7. 3, F), Poly- 

 morpha Dogiel (91; Fig. 7. 3, B), Prorodonopsis Gassovsky (91; Fig. 7. 3, M), and 

 Sulcoarcus Hsiung (91; Fig. 7. 3, N). 



Family 5, Chlamydodontidae. The cilia are restricted essentially to the 

 ventral surface (Fig. 7. 4, D). A narrow transversely striated band borders 

 the ciliated area in Chlamydodon. The cytostome is antero-ventral and 

 the pharynx is surrounded by a pharyngeal-basket (Fig. 7. 4, J). Adoral 

 membranes are sometimes present but are always small and poorly de- 

 veloped and lie anterior to the cytostome. There is no ventral proto- 

 plasmic stylus such as is found in the Dysteriidae (Fig. 7. 5, I). The 

 Chlamydodontidae commonly feed on diatoms and other algae, phyto- 

 flagellates, and bacteria. 



The family includes the following genera: Chilodonella Strand (102, 141, 165; Fig. 7. 

 4, J), Chlamydodon Ehrbg. (102, 140; Fig. 7. 4, E), Cryptopharynx Kirby (113; Fig. 7. 

 4, K), and Phascolodon Stein (102; Fig. 7. 4, C, D). 



Family 6. Colepidae. These are somewhat barrel-shaped forms with an 

 armored cortex. The armor is composed of plates (Fig. 7. 4, I), the form 

 and arrangement of which vary with the species. The armor of Coleps 



