237 



The outer layer of the cuticle on the greater part of the 

 female worm measures about 10 jx in thickness between the 

 ridges. The underlying region is about 20 /x thick and is 

 subdivided between each pair of ridges, usually into three 

 (occasionally four) ring-like segments and there is one below 

 each ridge (figs. 25, 26). From the apex of one ridge to 

 that of the next one there are, then, three complete and two 

 half rings of the under-cuticle, just as figured by Neumann. 

 Thus there appear four striae between the ridges. Joan (p. 

 447) figures eight such secondary annulations and nine striae 

 as occurring between the main ones, the latter being 127 \i 

 apart and the former 15*5 tt. In our specimens the secondary 

 rings measured from 7 to 10 j* (the main rings, i.e., those 

 below the ridges, being rather wider than those intervening), 

 when the ridges were 45 /a apart; and about 20 /x in width 

 when the summits of the ridges were 95 /j. distant from each 

 other. 



The mouth is immediately followed by the long tubular 

 oesophagus, about 1*52 mm. long and measuring from 12 to 

 18 fx in diameter in front of the nerve-ring and 22 to 25 p. 

 behind it. Surrounding the anterior end of the oesophagus 

 there is a mass of cells which appear to be glandular. The 

 intestine does not call for comment. 



As already stated, the position of the nerve-ring corre- 

 sponds with the anterior dilatation of the body and lies at 

 about 220 to 240 ja from the mouth. The excretory pore 

 appears to be situated in this region. The thick-walled 

 vagina opens at the level of the second dilatation, about 

 *50 to '57 mm. from the anterior extremity of the worm 

 (fig. 9). Uterine eggs, containing fully-developed larvae, have 

 very thin shells and measure 32 to 37 /x in their major diameter 

 and 23 to 30 /x in their minor axis. Larvae found free in 

 the uteri have a length of about *20 mm. and a breadth of 

 5 /a, the anterior end being bluntly rounded and the posterior 

 pointed. 



Description of the Male. 



Figs. 4, 10, 13, 20. 



The male worm maintains a comparatively even diameter 

 throughout, being '05 to '06 mm. in front of the nerve-ring 

 which lies at '18 to '20 mm. from the anterior end, gradually 

 widening to '08 to '09 mm., and maintaining the latter 

 breadth until near the posterior extremity. At the level of 

 the anus the diameter is '04 mm., the worm gradually taper- 

 ing to the tip. The anterior dilatation in the vicinity of 

 the nerve-ring is very slight, the diameter' of the parasite 

 there being about '065 mm. The second dilatation of the 



