74 



S. VOSI II DA : 



the elongation being effected by the anterior body-parts only. Moreover, 

 in the living state the posterior body-parts show irregular wrinkling on the 

 surface, a characteristic feature from which I have named the species. In 

 fixed specimens the wrinkles disappear altogether. Killing the worms 

 with hot Schaudinn's solution, the body slightly contracts but prescves its 

 general shape fairly well. Specimens so killed present cross-sections of 

 an outline which is elongate oval in most parts, but nearly circular at 

 either end of the body. 



Length and greatest breadth of body as measured on living specimens : 

 3.2x0.84 mm.; 1.7 — 2.44 x 0.9 mm.; 2.3x0.9 mm.; 1.6 — 2.12 X0.6S mm. ; 

 1.6 (slightly contracted) X I mm. ; 1.37 (contracted) x 0.7 mm. ; 1.16x0.5 

 mm. (young) ; 1.0 x0.36 mm. (young); 0.8 X 0.36 mm. (young). Same as 

 measured on fixed specimens preserved in alcohol: 2.34x0.54mm.; 

 2.2 x0.48 mm.; 1.96 x0.4 mm.; 1.88 x0.54 mm.; 1.8S x 0.56 mm.; 1.88x0.5 

 mm. The broadest parts in all these cases were situated either nearly in 

 the middle or at about the boundary between the middle and last thirds of 

 body-length. Same as measured on specimens mounted in Canada balsam 

 under cover-glass : 2.S8 X 0.74 mm. ; 2.4 x 07mm. ; 2.0 X 0.4 mm. (young) ; 

 2.0x0.5 mm. (yg) ; 1.2 xo. 1 mm. (yg). 



Oral sucker subterminal, spherical or ellipsoidal, with aperture of 

 varying width according to different states of contraction of the organ. 

 Length and breadth of the sucker as measured in a living adult : 

 250// x 287//; same in a living young 150X213//. Same as measured 

 in specimens mounted in Canada balsam: 240x250/2 (by 3.2mm. body- 

 length); 230x220// (by 2.4mm. body-length); 166x200// (by 1.2mm. 

 body-length). 



Ventral sucker usually spherical or nearly so, always much smaller 

 than oral sucker of the same individual ; with aperture more persistent in 

 width than oral sucker. Length and breadth as measured in a living adult 

 125x150//; in a young 125x166//. Same as measured in mounted 

 preparations : 8S X 88// (by 3.2 mm. body-length) ; 120 x 120// (by 2.4 mm. 

 body- length) ; 99X90// (by 1.20 mm. body-length). 



