462 



MR. U. J. ORTLEPP OX A 



towards the autei'ior end until it reaches the posterior iiiargiii of 

 the vesicular swelling, where it is then 190 /u broad. Posteriorly 

 the narrowing is more gradujil until the level of the vaginal 

 opening, where the breadth is 360^ ; from here the narrowing is 

 very marked, and ends in a pointed tail. 



In a male 12*5 mm. long the breadth of the body at the base of 

 the vesicular swelling is 170/./. From here the breadth increases 

 until a maximum of 380 ju is reached about half-way down the 

 length of the worm ; posteriorly the body tapers until the 

 anterior margin of the bursa is reached, where the breadth is then 

 227 /x. 



Text-fiijure 1. 



;.p - - 



Lateral view ot anterior end of bodj'. 



O.P. = position of cervical papilla ; E.P. = excretory pore ; Int. = intestine; M.C. = 



mouth collar ; N. = nerve ring; Oes. = a?sopliagus; V.S. = vesicular swelling. 



The mouth collar surrounds the mouth capsule (text-fig. 2) ; 

 this latter is a chitinous structure whose breadth is about three 

 times its depth ; it is somewhat cylindrical in shape, having its 

 anterior opening slightly smaller than its posterior ; anteriorly it 

 bears a crown of ten large leaf elements, which pass through tlie 

 mouth and whose extremities are slightly recurved over the 

 anterior part of the mouth collar. An internal leaf- crown is 

 present, and it consists of about twice as many small elements as 

 the external leaf-crown. The mouth aperture is surrounded by 

 the usual six papillae, two short a.nd broad laterals, and four 

 longer submedians which pierce the mouth collar. 



