396 Ciliophora 



Fig. 7. 38. A. Trifasciciilaiia parvum Hsiung, x322 (after H.). B. Polar 

 view of peristome in Tripalmaria dogieli showing outer membranelles and 

 basal plates of the adoral zone leading to the cytostome; x260 (after Strel- 

 kow). C. Longitudinal section through antero-dorsal group of membranelles 

 in Tripahtiaria dogieli; x550 (after Strelkow). D. Triadiniiim caudatum 

 Fiorentini, x322 (after Hsiung). E. Spirodinium equi Fiorentini, x322 (after 

 Hsiung). F. Polydinium mysorenm Kofoid, from Indian elephant; x275 (after 

 K.). G. Tripalmaria dogieli Gassovsky, x.'522 (after Hsiung). H. Cyclopes- 

 thium bipalmatum (Fiorentini) Bundle, x363 (after Hsitmg). 



Family 2. Cycloposthiidae. Cochliatoxum Gassovsky (91), Cycloposthium Bundle (91, 

 193, 194, 195; Fig. 7. 38, H), Ditoxum Gassovsky (91; Fig.?. 37, G), Polydinium Kofoid 

 (114; Fig. 7. 38, F), Spirodiniiun Fiorentini (91; Fig. 7. 38, E), Tetratoxum Gassovsky 

 (44, 91; Fig. 7. 37. C), Triadinium Fiorentini (91; Fig. 7. 38, D), Trifnsciciilaria 

 Strelkow (197; Fig. 7. 38, A), Tripalmaria Gassovsky (91, 196; Fig. 7. 38, B, G), 

 Triplumaria Hoare, Troglodytella Brumpt and Joyeux (208). 



Suborder 5. Hypotrichina 



Somatic cilia are replaced by cirri which are nearly always limited to 

 the ventral surface. The dorsal surface often bears rows of so-called sen- 

 sory bristles, which are sometimes present also on the ventral surface 

 adjacent to cirri. The ventral cirri are typically arranged in groups (Fig. 

 7. 40, E, F, J): frontal cirri, located between the peristome and the right 

 side of the body; ventral cirri, posterior to the frontal cirri; marginal 

 cirri, arising from the right and left margins of the ventral surface; caudal 

 cirri, arising from the posterior margin; and anal cirri, arising in a trans- 

 verse or diagonal row a short distance from the posterior end of the body. 

 Certain cirri, particularly the lateral ones, may be lacking in some species. 



