248 



s. GOTO. 



inn- to Taschcnbcrg, wholly continuous Avith each other ulong the 

 posterior l)order of the l)ocl3\ 



4. Tristomwn foUaceum, n. sp. 

 (PI. XXIV, figs. 10-12 ; PI. XXV, fig. 9.) 

 Bodij elongated, slightly ovate, about G mm. by o mm.; 

 with the anterior border brace-shaped (-^); lateral margins entire, 

 destitute of any chitinous corpuscle, and divided from the median, 

 anterior lobe of the body only by a slight constriction, where the 

 anterior suckers are attached ; with a not very deep notch ;it the 

 posterior end. Anterior suclccrs circular, of moderate size in com- 

 parison to the body. Fostcrior sucker slightly elliptical, with the 

 major axis directed antero-posteriorly, projecting ])eyond the body by 

 about one-third of its length ; provided with a marginal membrane ; 

 with a diameter equal to the Ijreadth of the body just behind the 

 anterior suckers ; its internal surface divided into areiis just as in 

 T. ovale. Hooks in one pair, in position as they are in T. ovale, 

 hollow, spinous, with a deep notch at the proximal end, of the form 

 represented in hg. 11, PI. XXIV, about 0.175 mm. long on the 

 average. In the specimen examined ])y me the hooks were of unequal 

 lengths on the two sides, that of one side being 0.164 mm. and that 

 of the other 0.18(1 mm., thus giving the average above recorded. 

 Mouth of moderate size, at the plane of the hinder end of the 

 anterior suckers, rharijnx divided by a constriction into two unequal 

 portions as in T. ovale. Oesophagus very short. Intestinal trunhs 

 continuous with each other behind, a little in front of the posterior 

 sucker, with numer(^us dendritic branches on the outer side, and with 

 a few shorter liranches on the inner ; enclosing a not very ex- 

 tensive area in the middle portion of the body similar in form to 

 that of the latter. Common genital opening a little on the left side of 



