Ciliophora 355 



to the body surface, while the left wall tends to slope more gradually. 

 The somatic ciliary rows commonly form a somewhat concentric series 

 around the right margin of the peristome (Fig. 7. 12, G, J), while 

 the organization of the adoral ciliature varies to some extent within the 

 family. In Woodruffia metabolica (Fig. 7. 12, K), the left margin of the 

 oral groove bears a row of membranelles, each composed of two or three 

 fused cilia, while a delicate undulating membrane extends along the right 

 (96). Although the undulating membrane and the membranelles are 

 simple in structure, this type of adoral ciliation is similar to that found 

 in Heterotrichina. Fission within a reproductive cyst (Fig. 7. 13, B-D) is 

 typical, although it has been possible to obtain fission in the active stage 

 in Colpoda under experimental conditions (198). The usual diets range 

 from small ciliates to algae and bacteria. 



The following genera have been included in the family: Bresslau Kahl (39, 102; Fig. 

 7. 13, A), Bryophrya Kahl (102), Colpoda Miiller (14; Fig. 7. 12, G, H), Tilli?ia Gruber 

 (102, 213; Fig. 7. 12, I) and Woodruffia Kahl (96, 102; Fig. 7. 12, J, K). 



Family 4. Conidiophryidae. These are ectoparasites which live attached 

 to exoskeletal hairs of amphipod and isopod Crustacea. The adult (Fig. 

 7. 13, E), a non-ciliated stage in a secreted membrane, produces by ter- 

 minal budding a series of small ciliated stages (Fig. 7. 13, F, G), or 

 "tomites." The migratory stage swims about until it reaches a host and 

 becomes impaled upon an exoskeletal hair which passes into the pharynx 

 (Fig. 7. 13, H). The cilia then disappear and the young parasite secretes 

 a membrane around itself and the distal portion of the hair upon which 

 it is mounted (Fig. 7. 13, I). During growth, nourishment apparently is 

 furnished by a secretion of the exoskeletal hair. 



The family includes the genus Conidiophrys Chatton and LwofE (29; Fig. 7. 13, E-I). 



Family 5. Cyathodiyiiidae. This group, from the intestine of guinea pigs, 

 contains several species of Cyathodinium da Cunha (131, 132; Fig. 7. 13, 

 J). Cilia are limited to approximately the anterior half of the body. The 

 non-ciliated peristome is a rather long triangular groove. From a row of 

 papillae along the left rim of the peristome, slender trichites ("endosprits" 

 of Lucas) extend into the endoplasm. Externally, an adoral cilium arises 

 from each papilla. 



These ciliates are unusual in that fission (Fig. 2. 4, D, F) involves re- 

 organization with a change in polarity so that the plane of division sep- 

 arates the posterior ends of the two daughter organisms. Furthermore, 

 the parental ciliature is discarded in fission and the primordial ciliature 

 of each daughter develops in the endoplasm and then passes to the sur- 

 face, where it becomes differentiated into the ciliation of the adult (132). 



Family 6. Entorhipidiidae. These ciliates occur in the digestive tract of 



