Parasitic Worms from East Africa. 



289 



the present case is one of pseudo-parasitism, the actual host 

 having been some bird or other animal upon which the 

 mongoose had iust been feeding when it was killed. The 

 worms are fairly well preserved, though the cuticle or the 

 male lias been ruptured in one place. 



The total length is about 14 mm. in the male and 21 mm. 

 in the female. 'The body, especially anteriorly, is flattened 

 dorso-ventrally. The maximum thickness (from side to side) 



Fit?. 6. 



r.s 



Thelazia depressa. Caudal end of male ; lateral view. 

 a.p., accessory piece ; l.sp., left spicule; r.sp. f right spicule. 



is 1 mm. There are pronounced transverse cuticular rings, 

 with very prominent posterior edges. They are especially 

 well-niaiked on the anterior portion of the body, where they 

 are 25-35 /* in width (antero-posteiiorly). Towards the tail 

 they gradually become narrower and less prominent. 



There is a wide and shallow mouth-capsule with very thick 

 cuticular walls (fig. 5, w.c), but without teeth. It measures 

 0'04 mm. in depth and OOo-O'OG mm. in width. The mouth 



