ox SOME QUEENSLAND TKEMATODES. 
391 
is flat and shallow. The diameter of the oral sucker varies 
ill the various specimens from 0’375 to 0‘424 mm., while that 
of the ventral varies from 0’63d to 0’652 mm., the average 
ratio of the oral to the ventral being 1 : TO. The musculature 
of the body-walls is only poorly developed. 
A strongly developed muscular pharynx, 0'25 mm. in dia- 
meter, leads directly out of the oral sucker, and is joined 
posteriorly by an oesophagus of rather less length, 0T95 mm. 
The intestinal limbs, which run some distance from the lateral 
edges of the body, roughly dividing it into thirds (fig. 13), 
do not quite reach the posterior end, and throughout their 
course give off about a dozen short branches from each 
side. 
The excretory pore lies on the dorsal surface near the 
posterior end, and leads into a long tubular vesicle which 
runs forwards as far as the ovary, coursing dorsal to the 
uterus, and giving off a few small branches in its course. 
The cerebral ganglia lie one on each side of the oesophagns, 
with the usual dorsal commissui’e and a pair of lateral cords 
that run backwards outside the intestinal limbs, giving off 
numerous short branches. 
The genital pore lies on the ventral surface, in the middle 
line, just beneath the intestinal fork. The testes are very 
large, more or less compact bodies, lying wholly outside the 
intestinal limbs. From the posterior edge of the ventral 
sucker they extend backwards to within half their length 
of the posterior extremity. Each testis is divided up into 
two or three pieces, each of which is deeply lobed. The two 
vasa deferentia join near the middle of the ventral sucker 
and immediately enter the vesicula seminalis, which is long, 
tubular and coiled. The cirrus sac and ejaculatory duct are 
very poorly developed. 
The ovary consists of three rounded lobes, and in its 
greatest diameter measures 0’326 mm. A small ^^shell- 
gland lies on its left side, and just in front of it a 
receptaculum seminis, somewhat smaller than the ovary. 
The yolk-glands consist of fifteen to twenty small rounded 
