Ciliophora 357 



Family 7. Isotrichidae. This family is characteristic of the ungulate 

 rumen, although a species of Isotricha is known from cockroaches (217). 

 The moiuh is terminal or subterminal and a ciliated pharynx has been 

 reported (Fig. 7. 15, I, L). Longitudinal striations also have been de- 

 scribed in the wall of the pharynx. Whether these represent trichites is 

 uncertain, and they may be merely fibrils of the pharyngeal ciliature. The 

 somatic ciliation is complete and practically uniform. A cytopyge lies at 



Fig. 7. 14, A. Entorhipidium echini Lynch, upper surface; macronu- 

 cleus, micronucleus, trichocysts, and pharynx indicated; x203 (after L.). 

 B-D. Other species of Entorltipidium, xllO (after Lynch): E. tenue Lynch 

 (B), E. multimicnmucleatiuu Lynch (C), E. pilatum Lynch (D). E, F. Erito- 

 discus borealis (Hentschel), surface view (E), x270; longitudinal section (F) 

 through oral cavity, showing adoral cilia, the parastyle (a rod-like structure 

 along one margin of the peristome), and the pharynx in outline, x335 

 (after Powers). 



the aboral end in certain species. Although the cytostome is usually con- 

 sidered anterior, several species swim with this end of the body directed 

 posteriorly (4). 



Two genera have been referred to the family: Dasytricha Schuberg (4, 12; Fig. 7. 

 15, I, J) and Isotricha Stein (4, 51; Fig. 7. 15, K. L). 



Family S. Marynidae. These are solitary or colonial ciliates with a 

 gelatinous lorica. The peristome partially or completely encircles the free 

 end of the body and extends posteriorly for some distance on the ventral 

 surface (Fig. 7. 15, C). The organisms swim with the aboral end forward. 



