386 



■1. They are sharp-tailed and sheathless. 

 3. They have no periodicity, ■ 



F. demarquan : — 



1. Length, two hundred and five m by 

 five /". 



2. Tail sharp and sheathless. 



3. Cephalic armature, ill-developed prepuce 

 and spine. 



4. A V spot exists fifty-two m from the 

 head (seen in wet films). 



5. There is no periodicity. 



6. Ce. argyrotarsis and Ce. albipes are in- 

 efficient hosts. 



F. loa. — Two cases of infection with the adult 

 F. loa have been described in which F. diurna 

 occurred in the blood. It is possible then that 

 F. diurna is the embryonic form of F. loa (vide 

 F. diurna antea). On the other hand, F. diurna 

 embryos are indistinguishable from those of F. 

 bancrofti, the adult forms of which are well 

 known. 



F. megalhaesi. — Adults only known. 



F. gigas:— 



1. Blunt tailed. 



2. Has no sheath. 



The Characters of the Genus Filaria 



They are long slender worms of almost 

 uniform breadth throughout their length. The 

 anterior extremity is rounded, and the mouth 

 often has no lips. The males are distinctly 

 smaller than the females. They have an incurved 

 or spiral tail, the latter sometimes having lateral 

 membranous outgrowths. They usually have 



