Parasitic Worms from East Africa. 



285 



of the body they attain a maximum width (measured from 

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

 next) of 01 mm. 



The anterior end of the worm is provided with well- 

 developed lateral alse (fig. 1, a.), attaining a width 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 



Fiar. 3. 



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

 0-7-0*9 mm., and the excretory pore at 0*85-1*0 mm., from 

 the anterior extremity. " Internal vesicles " (cf. Ascaridia 

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

 very large (up to 0*4 mm. in diameter). 



