220 



Mr. E, A. Spaul on some 



conical, and flask-shaped, situated at the level of the anterior 

 edge of the sucker j immediately behind is a similar though 

 larger pair ; the next pair varies in size between finger-like 

 processes in the smaller and prominent flask-shaped masses 

 similar to the preceding ones in the older and larger speci- 

 mens. The same applies to the next pair, situated just 

 behind these, but further from the middle line, and directed 

 slightly outwards and posteriorly. The latter pair is level 

 with tlie anus, which has a small pair of sessile papilla3 in 



Fig. 2 b. 



w 



i 





'^ 



i 



■-> 



(. 



•;• 





? 







'>, 













'.'; 







>, 







ti 





1 



I 



- 



\ 



I d 





'M aI 



'' f f J 



if 



Side-view of male tail, showing relative sizes of papillae. 



front of it and a similar pair behind it. Posteriorly, on 

 either side of the terminal spike, is a cluster of three papillae 

 which vary in shape, but they are usually small and finger- 

 like, and are situated at different levels. At the base of the 

 spike there is a small median ventral protuberance, similar, 

 apparently, to the median papilla described by Gendre, but 

 as it is difficult at times to locate and not constant in its 

 occurrence it can hardly be described as a papilla. There is 



