PARASITIC WORMS LKII-KI; AND ATKINSON. 



;n ilir broadest |ini-iiiiii near ihe base (I'O.'i nun. Tin- three li[is are ()'|:!."i mm. long and 

 ()'l :! mm. broad. 



The oe.-ophao'iis is ;i muscular tube -\>'-> mm. lung by 0'4 mm. broad (I'l. I. tin. '-'. <'). 

 The terminal ]iurtiun is slightly differentiated to t'urin a muscular bulb with a glandular 

 appendix ( I'l. 1. tig. L'. /') characteristically short as compared with other forms 

 possessing this structure. It measures I)'.').") mm. in length by ()"2'2 mm. in breadth. 



The chyle-intestine is verv voluminous and its wall is markedly folded. It 

 has aii anterior caecum extending forward tor 1'8 mm. to within 0'7 mm. ot 

 the head (lM<_!'. -. c). It occupies the whole of 



the perivisceral space liei\\eeu the oesophageal tube 

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

 lireadtli of ii'-l mm. These characters are dnph- 

 cMiecl in the female specimens: the measure- 

 ment^ show a slight variation in accordance 

 with the difference in the sixes of the complete 

 worms. 



The anogenital aperture lies (r:'.4 mm. in front of 

 I lie tip of the tail, and two chitinous spicnles are seen 

 extended in maiiv of the specimens. Thev are unequal 

 in si/.e. hut of similar shape (1M. I. tig. ."). .-//). At the 

 proximal end these spicules are slightly dilated. They 

 measure :! mm. liy 0'0'J mm., and '2'7 mm. by 0'09 mm. 

 The course of the lesticlllar tilde is olisclired liV tile folds 



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

 forwards at least to the level of the oesophageal 

 appendage. 



The papillae are arranged in t hive sets. Grouped 

 around the base of the finger-like process (text-iig. 1 . />) 

 which occupies the posterior end of the liodv are four 

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



these and the am "jelii t a 1 aperture a second set of four 

 pairs (text-tig. I. <) are set on the lateral margins of 

 i lie ventral aspect of the worms. A loii"' series of 



i o 



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

 aperture ( text -tio-. I. i ). These are arranged in two linear rows on each side. Four 

 double pairs lie behind the level 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 io be regarded as a minimum, as it 

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

 1 crimnal pairs of 1 lie series. 



Tin !'< unlit'- are slightly lamer than the males. They present the same characters 



1. Kathlcena scotti : ventral 

 of the posterior extremity of the 

 male, it, Auojjcnital apei-turc : 

 b, caudal process : c, jmstanal 

 papillae : it, caudal ^'roup of papil- 

 lae ; i', jireaiial pa]iillae : /', ciiti- 

 ciihir alae. 



