384 



Embryos of F. loa, taken from the female, are 

 described by Annett and Button. 



1. Length, 208 m. 



2. Possess a sheath. 



3. Spots as follows : — 



(i) An oval or diamond-shaped spot, twenty- 

 four per cent, length from anterior end. 



(ii) An indistinct lateral area containing 

 scattered nuclei, thirty-seven per cent, length. 



(iii) A longer portion of worm which stains 

 badly, sometimes divided into anterior and 

 posterior portions. 



(iv) A small lateral bay, eighty-six per cent, 

 length. 



F. Persians. — Embryos present in peripheral 

 blood day and night. 



1. Length, two hundred /u by four fj. to 

 five M breadth in fresh, and about ninety m in 

 stained preparations. 



2. Do not possess a sheath. 



3. Movements extremely active, and pro- 

 gressive movement continues for many hours. 

 They possess the power of considerable elonga- 

 tion and shortening. 



4. No hooked prepuce, a fang is generally 

 observed protruded and retracted. The body 

 tapers gradually for two-thirds of length, and is 

 abruptly truncated at the tail and slightly 

 bulbous. 



5. In stained specimens the following spots 

 are made out : — 



(i) A narrow irregular transverse band at 

 distance of 26-4 per cent, length, nearly always 

 present. 



