Ciliophora 385 



The genus Condylostoma Bory (13, 104, 214; Fig. 7. 30, A, C, D) is the only one 

 assigned to the family. 



Family 6. Folliculinidae. These are widely distributed marine ciliates 

 which live attached to various plants and animals. The body is enclosed 

 in a relatively thin "pseudochitinous" lorica. At the oral pole, the body 

 is extended into two mobile lobes traversed by a spiral zone of mem- 

 branelles extending down to the cytostome (Fig. 7. 30, L). The rest of 

 the body is rather uniformly ciliated. Upon completion of fission in 

 Folliculina, the anterior daughter leaves the lorica as a free-swimming 

 larva (Fig. 7. 30, I) which, after a short migratory period, becomes 

 attached and secretes a lorica (47). 



The following genera, which are distinguished mainly by differences in general form 

 of the lorica, have been recognized: Folliculina Lamarck (1, 47, 56, 104; Fig. 7. 30, K), 

 Folliculinopsis Faure-Fremiet (57. 214; Fig. 7. 30, J, L), Metajolliculina Dons (104), 

 Microfnlliculina Dons (104; Fig. 7. 30, H), Pnrafolliculina Dons (104; Fig. 7. 30, B), 

 Pehrilla Giard (104), and Pseudojolliculina Dons (104; Fig. 7. 30, M). 



Family 7. Liclmophoridae. Both ends of the elongated body are dis- 

 coidal, while the mid-region is somewhat constricted. The zone of mem- 

 branelles surroimds most of the antero-ventral, or oral, disc and extends 

 into a depression of the peristome. The posterior disc (basal disc) is sur- 

 rounded by several concentric undidating membranes, and just anterior 

 to these, by a flexible flange, or velum. The basal disc is somewhat ctip- 

 shaped and serves for attachment lo the host. With one or two exceptions, 

 the Liclmophoridae are marine ectocommensals. 



There is only one known genus, Lichnophora Clapar^de (3; Fig. 7. 31, J). 



Family 8. Metopidae. These are often uniformly ciliated heterotrichs in 

 which the peristome tends to curve to the right posteriorly. The zone of 

 membranelles is rather straight in primitive Metopidae but spiral torsion 

 may be marked, as in Caeiiomorpha (Fig. 7. 31, G). A relatively short 

 undulating membrane often extends along the right margin of the 

 peristome. Trichocysts may be present, sometimes underlying pellicular 

 ridges or bands separating the rows of cilia. 



The Metopidae, represented in fresh and salt water, include the following genera: 

 Bryoinetopus Kahl (104), Caenomorpha Perty (104, 214; Fig. 7. 31, G), Copemetopus 

 Viheneuve-Brachon (214), Ludio Penard (104, 165), Metopus Claparede and Lachmann 

 (104, 214; Fig. 7. 31, A-C, I), Palmarium Gajevskaia (104), Spirorhynchus da Cunha 

 (104; Fig. 7. 31, H), Trochella Penard (104, 165), and Tropidoatractus Levander (104). 



Family 9. Peritromidae. These are marine ciliates which superficially 

 resemble hypotrichs in their dorso-ventrally flattened bodies and the 

 reduction of ciliation to the ventral surface. The dorsal surface may bear 



