CILIATE PROTOZOA (INFUSORIA) 



273 



22' (17) 

 23 (24) 



21 (18) With a terminal bristle. Similar to Holophrya in shape. 



Urotricha Claparede and Lachmann. 

 Representative species. 



Urotricha farda Claparede and Lachmann 1858. 



Body obliquely striated; posterior bristle obliquely directed 

 when at rest. Progression by slow forward movement or sud- 

 den leaps to one side. Mouth on a small circular prominence 

 at the anterior end. Length 20 11. Pond water. Balantozoon 

 of Stolies agrees with this genus except that only the anterior 

 two-thirds is ciliated. 



Fig. 465. Urotricha farcta. X 43s. (After Conn.) 



Anterior end oblique. . . . 23 



With a spiral series of long cUia on either side of a ridge extending 

 from the anterior border to the posterior extremity. 



Perispira Stein. 

 Representative species. . Perispira strephosoma Stokes 1886. 



Body elongate-ovate. Cilia of the general surface very fine. 



Protoplasm filled with dark-colored corpuscles. Length 80 ^. 



^^S^^^i^fc Standing water with sphagnum. 



Fig. 466. Perispira strephosoma. X 280. (After Stokes.) 



24 (23) Without a spiral series of cilia . .25 



25(26) Elongated, with mouth slightly on one side; uniform ciliation. Nu- 

 cleus single. . . Enckelys Hill. 

 Representative species. . Enchelys pupa Ehrenberg 1836. 



Body inflated, slender anteriorly. Often colored green. 

 Length about 200 ji. Stagnant water. 



Fig. 467. Enchelys pupa. X 150. (After Conn.) 



26 (25) 



27 (16) 



28 (33) 



29 (32) 



30 (31) 



Elongate, sac-like, mouth occupying the oblique surface. Pharynx 

 slightly developed, sometimes with rods. Nucleus bead- 

 hke. . . . Spathidium Dujardin. 



Representative species. . Spathidium spathula Dujardin 1841. 



Very diflicult to distinguish from forms of the genus 

 Enchelys. 



Fig. 468. Spathidium spathula. X 250. (After Conn.) 



With pharynx well developed. 28 



Body greatly elongated 29 



Body flattened 30 



Flask-shaped with an elongated neck-like anterior end. Proboscis 

 short, retractile. Mouth terminal leading into a long 

 pharynx. . . Trachelophyllum Claparede and Lachmann. 

 Representative species. . Trachelophyllum tachyhlastum Stokes 1884. 

 Body eight or ten times as long as broad; neck slender; 

 pharyngeal passage indistinct, narrow, longitudinally stri- 

 ate. Cilia of surface long, vibrating independently. 

 Nuclei two, subcentral. Contractile vacuole posterior. 

 Length, extended, 120 to 150 n. Bottom of shallow pools. 

 Fig. 469. Trachelophyllum tachyhlastum. cv, contractiie vacuole: 

 »>(K»,macronucleus. X 250. (After Stokes.) 



