21 (l8) 



22 (17) 



23 (24) 



24 (23) 



25 (26) 



CILIATE PROTOZOA (INFUSORIA) 273 



With a terminal bristle. Similar to Holophrya in shape. 



Urotricha Claparecle and Lachmann. 

 Representative species. 



Urotricha Jar eta Claparede and Lachmann 1858. 



Body obliquely striated; posterior bristle obliquely directetl 

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

 den leaps to one side. Mouth on a small circular {)r()mincnce 

 at the anterior end. Length 20 ^l. Pond water. Bulanlozoon 

 of Stokes agrees with this genus except that only the anterior 

 two-thirds is ciliated. 



Fig. 465. Urotricha farcta. X 435- (After Conn.) 



Anterior end oblique ' 2,5 



With a spiral series of long ciHa 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 ^. 

 Standing water with sphagnum. 



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



Without a spiral series of cilia 25 



Elongated, with mouth slightly on one side; uniform ciliation. Nu- 

 cleus single Enchdys Hill. 



Representative species Enchelys pupa Ehrenberg 1836. 



iP^^^'*'^;^ Body inflated, slender anteriorly. Often colored green. 



•J?-^IiP^^?!te«;£. Length about 200 m- Stagnant water. 



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



26 (25) Elongate, sac-like, mouth occupying the oblique surface. Pharynx 



slightly developed, sometimes with rods. Nucleus bead- 

 like Spathidium Dujardin. 



Representative species. . . . Spathidiiwi spatliula Dujardin 1S41. 

 ^^ n iimiiiii jM ^ ^ ^a^, ,.^ ^^^^^^^^^.^ Very difficult to distinguish from forms of the genus 



:^CCCJM$^''-^'C^^f/ Enchelys. 



Fig. 468. Spathidium spathula. X 250. (.\fter Conn.) 



27 (16) With pharynx well developed 28 



28 (33) Body greatly elongated 29 



29 (32) Body flattened 30 



30 (31) Flask-shaped with an elongated ncck-likc anterior end. Proboscis 



short, retractile. Mouth terminal leading into a long 



pharynx. . . . rmc/zf/^^/j/a'/Z/^m Claparetle and Lachmann. 



Representative species. . Trachelophyllum tachyblastiim Stokes 1884. 



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



'■>^^^,^^;_w-:-_i^..,_^^^^^ pharyngeal passage indistinct, narrow, longitudinally stri- 



_2^^|^^^^^^i??t:^2j:gs^^ ate. Cilia of surface long, vibrating indeix-ndently. 



''^^^^^^^^^ffT'^^S^^^^^^ Nuclei two, subcentral. Contractile vacuole ix)sterior. 



^^Tf./^- ^^ ^^ Length, extended, 120 to 150 /!• Bottom of shallow ptKils. 



Fig. 469. Trachelophyllum tachyblastum. cr, contractile vacuole; 



macn, macronuclcus. X 250- (After Stokes.) 



