BY S. J. JOHNSTON. 335 



being rounded. The longest specimen measured alive was 9 mm. 

 long, the average length of preserved specimens being about 

 8 mm., the breadth from 1 to 1-2 mm. In very many the body 

 is flexed ventrally. Colour when alive light salmon-pink. Cuticle 

 produced into a number of small, conical papillte, slightly recurved; 

 very numerous on the anterior part of the body, where 

 they are sharp-pointed, less numerous towards the middle, 

 becoming very few and blunt on the posterior third; length of 

 papillie lying about the anterior end about 0*013 mm.; the length 

 of the base 0-015 mm.* Suckers comparatively large and orbi- 

 cular, the longitudinal diameter slightly exceeding the transverse. 

 Oral sucker subterminal; ventral placed far forward, not much 

 behind the oral, the distance between them being about one-half 

 the longitudinal diameter of the oral sucker. Both suckers sessile, 

 each possessing a fairly deep cavity; devoid of hooks and lobes of 

 any kind. Average diameters of the oral sucker of the specimens 

 measured — longitudinal 0'68 mm., transverse 0*59 mm. ; of the 

 ventral, longitudinal 1-02 and transverse 0-85 mm. Common 

 genital aperture situated on ventral surface to the left of the 

 median plane, on a level with the pharynx about its middle. 

 Excretory pore situated at the extreme posterior end. 



Cuticle comparatively thick; the integument of the animal has 

 a longitudinally striped appearance owing to the bands of longi- 

 tudinal muscle underlying it; the stripes run from the ventral 

 sucker to the extreme posterior extremity. 



Alimentary canal simple. Mouth situated at the base of the 

 oral sucker, leading into a muscular pharynx. Pharynx protru- 

 sible, being found in a number of specimens everted into the 

 cavity of the oral sucker (figs. 3-4). Oesophagus, into which the 

 pharynx leads, so short as to be almost non-existent, immediately 

 dividing into the two branches of the intestine, which are simple, 

 unbranched and fairly straight, running almost to the extreme 

 posterior end of the animal, the blind, sac-like extremity being 

 about 0-2 mm. from the end of the body. Excretory system only 



* In the figure (fig. 1) the papillae are somewhat exaggerated in size. 



