320 



BIOLOGY OF THE PROTOZOA 



with which they have most affinities, then the classification of the 

 Hehozoa is simple. The division into orders following Hertwig and 

 Lesser (1874) is based upon the absence or the nature of the skeleton 

 elements. 



Fig. 143. — Campionema nutans with nuclei partly embedded in the .suhstanoe of 

 the axial filaments {A, B,). C, Section of Actinophrys sol with axial filaments arising 

 from intranuclear granules in recently divided nuclei. (After Schaudinn.) 



Order 1. Aphrothoraca, Hertwig and Lesser. — Body naked and 

 without gelatinous mantle or spicules. Typical genera: Adino- 



phri/s, Actinosphcprivni, Mj/.vastrum, Aciinohphvs, Cmwpifmema. 



Order 2. Chlamydophora, Hertwig and Lesser.— Body with a 

 soft gelatinous or felted fibrous covering. Ty})ical genera: Hetero- 

 phrys, SplicBrastru))!, Wugnerella. 



