934 MISS M. V. LEBOUR ON 



Testes behind centx-e of body, right in front of left. Cirrus-sac 

 reaching to posterior margin of ventral sucker. Ovary on right 

 side behind or slightly overlapping venti'aJ sucker. Yolk-glands 

 reaching from just in front of the level of the anterior margin of 

 ventral sucker to centre of testes or behind them. Receptaculiim 

 seminis uterinum pi-esent on right side of body behind right 

 testis. 



The body (fig. 1) is convex dorsally and neai-ly fiat ventrally, both 

 suckers being conspicuous and the ciri'us usually piotrudiug fiom 

 the genital pore. The length of matuie worms varies from 5 to 

 10 mm., the last-named being in the case of a specially well extended 

 specimen examined under pressure. Unfortunately, this large 

 specimen was damaged before being fixed . One immature specimen 

 occuired measuring 4*4 mm. in length which contained a few 

 eggs and had a very short uterus. In breadth the worms 

 measured from r2 mm. to ]"9 mm., the greatest breadth being 

 in the region of the ventral sucker. The average length is about 

 5*5 mm., breadth 1"4 mm. 



A good deal of interesting variation occurred in the arrangement 

 of the organs. The suckers vary but little, the ratio of the oral 

 and ventral suckeis being almost exactly 2 : 3. Both are circulai' in 

 outline with circular apertures. The aperture of the oral sucker 

 measures about 0*20 mm. across; the apei-ture of the vential 

 sucker is more than half the width of the sucker and very regular 

 and conspicuous. The ustial position of the ventral suckei- is 

 with its centre almost exactly at the anterior third of the body. 

 It may, however, be a little further back. In the young specimen 

 it is much nearer the centre of the body, a fact to be expected as 

 the hind portion of the body always increases to a much greater 

 extent than the fore part. 



The prepharynx is exceedingly shoit but quite distinct ; the 

 pharynx is bioad and muscular, the breadth slightly greater than 

 the length (length 0*20 mm.) ; the cesophagus is about the same 

 length as the pharynx. Surrounding the pharynx are large 

 glandular cells which are continued for a shoit distance down the 

 oesophagus. Pharyngeal glands aie mentioned by Staflbid in 

 L. primus (1905). The intestinal cajca vaiy in thickness in 

 different parts and reach usually about 0'60 mm. beyond the 

 testes ; beginning near tlie centi'e of the body, they gradually 

 become more lateral and slightly ventral in position until they 

 reach the testes, when they become quite irregular and ma}- be 

 both dorsal to the testes or one ventral and one dorsal (fig. 3) ; and 

 one may be longer than the other, in one case quite twice as much 

 extending beyond the left testis as the right. The usual length 

 beyond the testes is 0*60 mm. Sometimes the caeca bend inwards 

 so as to be completely internal to the testes. The ends are 

 swollen and very much broader in the posterior than in the 

 anterior part. 



The excretoi-y vesicle is large and opens at the extreme posterior 



