389 



6. Embryos in vitero, blunt tailed, not 

 sheathed. 



$ I. Length, forty-five mm. 



2. Head end as in female. 



3. Two caudal ends much coiled. 



4. One spicule and two papillae. 



5. Low describes four pairs of pre-anal and 

 one pair of post-anal, minute papillae. 



F. ozsardi. — Adult. 



1. Dimensions much the same as those of 

 F. bancrofti. 



2. Distinguished by the bulbous tail ; in F. 

 bancrofti it is not bulbous but circular. 



F. loa. — Adult forms travel about in con- 

 nective tissue. 



? I. Length, thirty to forty mm. (average). 

 Varies from sixteen to seventy mm. Breadth, 

 o"57 mm. 



2. No neck. Head cone shaped. 



3. Body cylindrical, tapers sharply towards 

 head and tail. 



4. Cuticle with bosses, except over the head. 



5. Tail terminates in a short incurved por- 

 tion, and has two small tubercles at its extremity. 



6. Mouth simple. 



7. Ova, contciining embryos, thirty-five m by 

 twenty-five m- 



8. Anal orifice on low, broad papillae, 0*3 

 mm. from the tip. 



$ I. Length, twenty-five to thirty mm. 



2. Uniform thickness except at head and tail. 



3. Cuticle with bosses, but not so numerous 

 as in the female. 



4. Tail not spirally twisted, merely incurved. 

 It possesses well-marked lateral alae. 



