288 FRESH-WATER BIOLOGY 



142 (141) Body elliptical to ovate, flexible. Three unequal rows of ventral 



cilia; frontal styles numerous. No anal styles. Marginal 



setae uninterrupted. . . Eschaneuslyla Stokes. 



Representative species. . Eschaneuslyla brachylona Stokes 1886. 



Anterior extremity slightly curved to the left with a con- 



?°^f!a:^. striction beneath the front border. Frontal styles about 



■( Jv"'J'''>5§'^^^Si twenty-five in oblique rows. Nucleus not observed. Con- 



_^//f^^^^^^ tractile vacuole canal-like along the left-hand border. Length 



pi^rWw Hiiiilw' about 200 li. Standing water with dead leaves. 



Fig. 521. Eschaneustyla brachylona. X 200. (After Stokes.) 



143 (134) One or two rows of ventral cilia . . . 144 



144 (145) One row of about seven large ventral cilia. Long border and anal 



cilia. . ' Bdladina Kowalewsky. 



14s (144) Two rows of ventral cilia; body not elongated in front. . . 146 

 146 (151) Body prolonged posteriorly into a tail-like process. . . . 147 

 147(150) Body not flask-shaped. 148 



148 (149) No anal styles; body narrow, elongated, sometimes contractile. 



The border setae pushed in on the ventral surface. 



Uroleptus Stein. 

 Representative species. Uroleptus musculus Mtiller 1786. 



Body slightly elastic; tail-like process short, conical. An- 

 i'r/.:-.i>=T"- ,^^^'^'^<"'?^i=^^ terior end curved slightly to the left, the posterior to the 

 ^^""^^/i^^i^'.-j^^^^^^^ right. Frontal styles three or four. Length 200 m. Among 

 aquatic plants. 



Fig. 522. Uroleptus musculus. X 150. (After Conn.) 



149 (148) With a row of seventeen anal styles upon the left side. In other 



respects like Uroleptus Amphisia Sterki. 



150 (146) Body flask-shaped, otherwise very similar to Uroleptus. 



Platytrichotus Stokes. 

 Representative species. Platytrichotus opisthobolus Stokes 1886. 



Frontal styles five. Nucleus single, posterior. Contractile 



vacuole single. The posterior tip of the body is changeable 



^^^ in form. It may be bifid, truncate, or rounded. Long hispid 



''^^'^''^'^^ffmiu^mJ^^ bristles are developed from the dorsal surface. Length 190 /». 



-..^^yr/jJ.^'WtAW Among sphagnum. 



Fig. 523. Flatylricltotus opisthobolus. X 200. (After Stokes.) 



151 (147) Body not prolonged into a tail-like process. Elongated, rovmded at 



both ends. With two uninterrupted rows of cilia on the 



ventral surface Holosticha Wrzesniowski. 



Representative species. . . Holosticha vernalis Stokes 1887. 



Frontal styles five or six. Anal styles from five to eight, 

 usually branched. Dorsal bristles numerous. Nuclei two; 

 contractile vacuole central. Length 190 ,.. Shallow pools, 

 =^j^£jjij<iiait»»«^S^~ observed with algae. 



Fig. 524. Holosticha vertialis. X 225. (After Ck)nn.) 



152 (133) Ventral cilia setae-like, often in interrupted rows 153 



153 (156) Ventral setae in more than one row 154 



