374 Ciliophora 



left at the cytostome. At the left of row 1 a double row of cilia (row B) 

 follows much the same path but does not extend so far posteriorly. In 

 addition, a short row of cilia lies near the anterior end of row B in some 

 species and there are also several rows of cilia in the pharynx (30). This 

 pattern varies in details in different species. The thigmotactic cilia of 

 some genera are merely the anterior cilia in normal rows. In others, the 

 posterior somatic cilia have disappeared, leaving only the thigmotactic 

 cilia. 



The family includes the following genera: Ancistrella Cheissen (37), Ancistrospira 

 Chatton and Lwoff (30), Ancistrum Maupas (30, 109; Fig. 7. 24, G), Boveria Stevens 

 (142, 169; Fig. 7. 24, I, J), Cheissinia Chatton and Lwoff (30, 37; Fig. 7. 24, F), 

 Hemispeira Fabre-Domeigue (30; Fig. 7. 24, A, B), Plagiospira Issel (30, 102), Pro- 

 boveria Chatton and Lwoff (30), Protophrya Kofoid (30). 



Family 4. Hypocornidae. These are ovoid to somewhat flattened ciliates 

 in which cilia are limited to the dorsal surface. An anterior or antero- 

 dorsal suctorial tentacle is present and there is no cytostome. However, 

 there is an antero-lateral field of supposedly vestigial adoral cilia (31). 



Three genera have been characterized by Chatton and Lwoff (31): Heterocoma 

 Chatton and Lwoff, Hypocotna Gruber (Fig. 7. 24, H) and Parahypocoma Chatton and 

 Lwoff. 



Family 5. Sphenophryidae. The adult stage is not ciliated although in 

 reproduction the "embryo" develops cilia and resembles the more spe- 

 cialized Ancistrocomidae (31). The suctorial tentacle is generally shorter 

 than that of the Ancistrocomidae and Hypocomidae and tends to be 

 funnel-shaped. 



Three genera have been recognized: Gargarius Chatton and Lwoff (27, 31; Fig. 7. 

 24, D, E), Pelecyophrya Chatton and Lwoff (31) and Sphenophrya Chatton and Lwoff 

 (31; Fig. 7. 24, C). 



Family 6. Thigynophryidae. The ciliation is essentially uniform. The 

 thigmotactic field is represented by short, closely set cilia in various 

 somatic rows (31). Conchophyllum caryoclada (Kidder) Raabe shows an 

 unusual branched macronucleus (HO). 



Three genera have been referred to the family: Conchophyllum Raabe (110), 

 Myxophyllum Raabe (106), and Thigmophrya Chatton and Lwoff (22). 



Suborder 5. Apostomina 



This group was established (24) for a number of ciliates with a 

 ventral cytostome so small that ingestion is probably limited to liquids 

 or minute particles. A peculiar "rosette" is characteristic of the ventral 

 surface (26, 28, 45). In Foettingeria (Fig. 7. 25, A-D, F) the cytostome lies 



