SPECIAL MORPHOLOGY AND TAXONOMY OF INFUSORIA 393 



4. Vroleytvs (Fig. 1, and Fig. 105, p. 222), with 4 or 5 rows of 

 ventral cilia, no caudal bristles. 



5. Strongylidimn, 4 to 5 rows of ventral cilia; with caudal 

 bristles. Differentiated frontal cirri are absent in : 





Fig. 176.— Tj-pes of Ciliata. A, Gaslrostijla steinii; B, Euplotes vanniis; C, Pleuro- 

 tricha lanceolata; D, Psilotricha acuminata. (A, B, after Calkins; C, D, after Stein.) 



tail. 



6. Epiclintes (Fig. 174), cilia rows straight; body with neck and 

 I. 



7. Holosiicha, cilia rows straight; body without neck or tail. 



