Parasitic Worms from East Africa. 



285 



of tlie body they attain a maximum width (measured from 

 the posterior limit of one ring to the posterior limit of the 

 next) of 0*1 mm. 



The anterior end of the worm is provided witli well- 

 developed lateral alse (fig. 1, a.), attainin<2^ a widtli of 0"3 mm. 

 or more at the widest part, which is at about 1*4 mm. from 

 the anterior extremity, and extending backward for from 3 to 



Fio:. 3. 



su. 



Ascaridia fasciata. Caudal end of male ; ventral view. 

 cl., cloaca ; r., lateral cuticular ridge ; su., sucker. 



4 mm. The oesophagus is simple and short, shaped like a 

 slender Indian club, and measuring 2'4:-3*7 mm. in length, or 

 roughly -^-^ of the total length. The nerve-ring is situated at 

 0"7-0"9 mm., and the excretory pore at 0*85-l"0 mm., from 

 the anterior extremity. " Internal vesicles " {cf Ascaridia 

 maculosa) are seen witliin the body-wall, some of them being 

 very large (up to O'i mm. in diameter). 



