174 T. H. JOHNSTON AND J. B. CLELA.ND. 



AH cuticular ornamentation appears to be absent from the 

 tail and head end of the male. 



The head end of the female is wider and more rounded 

 titan that of the male. At a distance of 0*65 mm. from the 

 anterior extremity of the former, i.e., just in front of 

 the vulva, the breadth is 0'16 mm., whilst the diameter 

 measured at the same distance in the case of the male is 

 only about half of this, being 0*085 mm. Park 1 stated that 

 be obtained from the pus of a "tumour," by washing, a 

 head which (he said) agreed in all particulars as regards 

 size and shape with the rest of the parasitic worm, but 

 until more than one was obtained he could not be certain 

 that it did belong to that worm. This head was stated to 

 have "teeth-like projections and briar-like barbs encircling 

 in a spiral manner in numerous rows . ." We cannot find 

 anything resembling Park's description. If his observation 2 

 be correct, then the head cannot belong to this worm. 

 Unfortunately we have not succeeded as yet in finding 

 the tail-end of a female though we have obtained many 

 mule tail-ends. These taper gradually and end in a fine 

 rounded extremity (fig. 3), the posterior end being some- 

 what loosely spirally coiled. 



The mouth is small, rounded and terminal, and appears 

 to be surrounded in the female by three slight projecting 

 lips. In the male, however, there was no trace of labial 

 structures. The oesophagus is long, its lumen being very 

 narrow. It extends backwards to the region of the vulva, 

 where it forms a small pyriform structure rounded at the 



Italy a mesenteric gland, which was possibly also 



