242 BR. R. T. LEIPKR ox [Feb. 1, 



The ovary occupies the centre of the triangular area, limited by 

 the testis anteriorly, the anterior half of the excretory vesicle 

 dorsally, and the dome of the ventral sucker ventrally ; it has a 

 diameter of - 5 mm. 



The shell-glands lie in the posterior angle of the same area just 

 below the ovary. 



Laurer's canal crosses the excretory vesicle near its duct, and 

 opens upon the dorsum lateral to and behind the excretory 

 pore. 



The excretory vesicle is an elongated fissure-like cavity 2'2 mm. 

 long and 03 mm. wide. It discharges by a duct only 015 mm. 

 in length on the dorsal surface, at a point in line with the anterior 

 borders of the ventral sucker and the ovary. 



A few specimens of this species occur in Dr. Sells' collection. 



7. Paramphistomum buxifrons, sp. n. (Text-fig. 31.) 



Enormous numbers of this species were found in the stomach, 

 attached to the mucous membrane. They are readily distinguish- 

 able by their brownish pigmentation and leaf- like shape. For 

 the present the species is placed in the genus Paramphistomum, 

 but it departs very considerably from the type as defined by 

 P. cervi in shape of the body, the position of the ventral sucker, 

 and the relation to each other of the two testes. 



Form, etc. — The body is very similar in shape to the leaf of the 

 box tree, and on this account buxifrons has been selected as the 

 specific name of the parasite. The measurements vary very 

 considerably with the amount of contraction of the individual 

 specimens. A large example may measure 5 mm. by 3 mm. in 

 breadth, and be only 04 mm. in thickness at the middle of the 

 body. Contracted specimens have a transversely corrugated ventral 

 surface and a distinctly convex but smooth dorsal surface. The 

 posterior end is always truncated, and the ventral sucker opens 

 quite terminally. This sucker has a dorso-ventral diameter of 

 0'7 mm., its wall is 03 mm. at its thickest part, and its aperture 

 is 015 mm. wide. The cuticle is smooth, but there are digitate 

 papillae surrounding the mouth, and the subcuticle on the ventrum 

 is pigmented and markedly thickened (O'Ol mm.), and the cuticle 

 covering it thrown into irregular transverse folds. 



The pharynx is pyriform, 0*45 mm. long by 0*24 mm. broad, 

 and the musculature is 0*08 mm. at its thickest part. There are 

 no pharyngeal pouches. 



The oesophagus has a length of 024 mm. and is 0-035 mm. 

 in breadth. Its wall is fairly strongly developed and measures 

 0*04 mm. in thickness. The whole oesophagus lies anterior to the 

 level of the genital pore. 



The gut-branches are about 0*06 mm. wide ; they pursue a 

 serpentine course and terminate about 0*1 mm. in front of the 

 ventral sucker. 



Genitalia. — The genital opening lies at the junction of the 

 anterior quarter with the rest of the body, - 5 mm. behind the 



