550 DESCRii'TioN OF [Poli/gastrica. 



locomotion have been observed in all the genera, and in all the species 

 except two, but in no case do they consist of simple vibrating pro- 

 boscides, but generally of numerous vibratile ciHa. In the genera 

 Actinophrys, TrichocUsciis, and Podojphrya, locomotion is performed by 

 slow-moving feelers. In seven genera the organs of nutrition have 

 been satisfactorily demonstrated, by the employment of coloured 

 food, but only in one has the entire course of an alimentary canal 

 been traced, though in most its course is indicated by the discharge 

 at the end of the body. Ehrenberg states the polygastric structiire 

 is to be seen lq all except the Arabian Bisoma. A double condition 

 as regards the sexual apparatus, is seen in Enchelys, Leucophrys, and 

 Prorodon. Complete self-di-\T.sion, both longitudinal and transverse 

 has been observed ; but neither gemmae or polj^i clusters. The 

 members of this family appear to me to resemble each other less than 

 any membranous one that has preceded. The most cui'ious animal- 

 cules among them are the double-bodied Bisoma and the teeth- 

 bearing Prorodon. 



The genera are distributed as follows : — 



surface of 

 body desti- 

 tute of vi- 

 bratile cilia 



direct 

 truncated 

 mouth J 

 (no lip) 



' vibratile / body simple Enchelys. 



cilia at the i 

 mouth j 



\ body double Disoma. 



ray-like 



tcntacula 



not vibra- ■i, 



tile 



f*'''\v!tVr%T''! Actinophrys. 



6talklesS'< 



(.rays at the edge ...Trichodiscus. 



. stalked Podophrya. 



oblique t no neck Trichoda. 



truncated I 

 mouth ) 

 _ (with lip) I with neck Lacrymaria. 



oblique truncated mouth, with lip Leucophrys. 



direct truncated mouth, no lip » Holophrya. 



Teeth present Prorodon. 



surface of 



body with 



vibratile 



cilia. 



In the an-angement of Dujardin, and under his fourth order com- 

 prehending "ciliated Infusoria without a contractile integument, 

 and with or without a mouth" — A family having the same name 



