23G 



DR. R. T. LKIPER OX 



[Feb. 1, 



The oesophagus is long and slender and becomes bulbous in its 

 posterior fourth ; it unites with the chyle intestine at 0*65 mm. 

 from the mouth in both sexes. 



The nerve-ring is very broad (O01 mm.) and surrounds the 

 oesophagus in its middle third at - 25 mm. from the head. 



The excretory pore opens 0*5 mm. from the anterior end of the 

 body. 



Text-fig. 27. 



A. Fil aria hippopotami. Tail of female. 

 B (head) and C (tail of male) of Cobboldia vivipara. 



In the male the testicular tube pursues an almost straight 

 course alongside of the intestine from the cloaca to within 

 0-5 mm. of the oesophagus, then sharply doubles upon itself for 

 0-24 mm. and ends in a blunted tip. 



The two spicules are short undulating chitinous rods with fine 

 transverse markings; they measure 0*26 mm. and 0*055 mm. in 

 length. 



The genital papillae are sessile and consist of a circumanal 

 group of five pairs, and in addition there are four pairs of post- 

 anals distributed along the tail at giadually diminishing distances 

 from each other. 



