PARASITIC WORMS — LEIPER AND ATKINSON. 



25 



;it the broadest portion near the base 0'05 mm. The three lips are 0*135 mm. long and 

 0*13 mm. broad. 



The oesophagus is a muscular tube 2*53 mm. long by 0*4 mm. broad (PL I, rig. l\ a). 

 The terminal portion is slightly differentiated to form a muscular bulb with a glandular 

 appendix (PL I, fig. 2, b) characteristically short as compared with other forms 

 possessing this structure. It measures 0*55 mm. in length by 0*22 mm. in breadth. 



due chyle-intestine is very voluminous and its wall is markedly folded. It 

 has an anterior caecum extending forward for L'8 mm. to within 0'7 nun. of 

 the head (Fig. 2, a). It occupies the whole of 

 the perivisceral space between the oesophageal tube 

 and the body-wall on one side, and attains a 

 breadth of 0*4 mm. These characters are dupli- 

 cated in the female specimens : the measure- 

 ments show a slight variation in accordance 

 with the difference in the sizes of the complete 

 worms. 



The anogenital aperture lies 0*34 mm. in front of 

 the tip of the tail, and two ehitinous spicules are seen 

 extended in many of the specimens. They are unequal 

 in size, but of similar shape (I'l. I, fig. 5, sp). At the 

 proximal end these spicules are slightly dilated. They 

 measure 3 mm. by 0'0'J mm., and 2*7 mm. by 0*09 mm. 

 The course of the testicular tube is obscured by the folds 

 of the chyle-intestine, but it can be seen extending 

 forwards at least to the level of the oesophageal 

 appendage. 



The papillae are arranged in three sets. Grouped 

 around the base of the finger-like process (text-fig. I . b) 

 which occupies the posterior end of the body are four 

 pairs of papillae (text-tig. I,'/). Half way between 

 t hese and the anogenital aperture a, second set of four 

 pairs (text-fig. I, <■) are set on the lateral margins of 

 the ventral aspect of the worms. A long series of 

 papillae then commences, extending to a considerable distance in front of the anogenital 

 aperture (text-fig. I, e). These are arranged in two linear rows on each side. Four 

 double pairs lie behind the leve.1 of the anus (a), but this number may vary. These 

 papillae, although situated postanally, belong to the preanal series. Twenty double 

 pairs were counted in this series. This number is to be regarded as a minimum, as it 

 was impossible to be certain that the most anterior papillae actually observed were the 

 terminal pairs of the series. 



The Female* are slightly larger than the males. They present the same characters 



Fig. l.—Kathleena scotti : \ entral view 

 of the posterior extremity of the 

 male, a, Anogenital aperture ; 

 b, caudal process ; c, postanal 

 papillae ; d, caudal group of papil- 

 lae ; c, preanal papillae ; /', cuti- 

 cular alae. 



