INTRODUCTION TO THE PROTOZOA 



35 



Blepharoconus Holophryoides 



Blephah'oprosthium Parnisotrichopsis 



Blephayosphaera Polymorphella 



Blepharozoum Prorodonopsis 



BuetschUa Sulcoarcus 



Family PYCNOTRICHIDAE 



Body completely ciliated. A long groove usually leads to 

 the cytostome, which may lie near the middle or at the 

 posterior end of the body. 



Bnxtouello 

 Infuiidibiiloriiiui 



Order SUCTORIORIDA 



Young with cilia; adults with tentacles. 



Family ACINETIDAE 



With endogenous budding. Tentacles capitate, usually ar- 

 ranged in groups. Lorica often present. Stalk present or 

 absent. 



Allantosoma 



Order TRICHOSTOMORIDA 



Cytostome usually at base of well-defined oral groove or pit, the wall 

 of which bears 1 or more dense fields of adoral cilia; in some primi- 

 tive forms the cytostome is almost at the anterior end, but more often 

 it is shafted posteriorly on the ventral surface. Spiral torsion of the 

 body occurs in some genera. 



Family BLEPHAROCORYTHIDAE 



Somatic ciliation reduced to a few anterior and posterior 

 fields, with 1 or 2 groups of anal cilia near the cytopyge 

 and 2 or 3 distinct anterior groups. Cytostome antero- 

 ventral, opening into a long ciliated pharynx. 



Blepharocorys Qchoterenaia 



Charonina 



Family CYATHODINIIDAE 



Cilia limited to anterior half of body. Peristome a non- 

 ciliated, rather long triangular groove. Slender trichites 



