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four pre-anal and a variable number of post-anal 

 papillae and spicules, which vary in size and 

 appearance. In the females the vulva opens in the 

 neighbourhood of the mouth. The host in which 

 the filaria reaches full maturity, giving rise to 

 embryos, is the definitive host, the other host is the 

 intermediary or secondary host. Thus F. hancrofti 

 has for its definitive host, man, for its inter- 

 mediary host, certain species of Culicidae. 



F. recondita. — Definitive host, dogs. Inter- 

 mediary host, Ct. cams (dog-flea). 



Adult Filariae 



1. F. hancrofti. — The adult male and females 

 are found together, sometimes in the lymphatics 

 or in cyst-like dilatations of these. The embryos 

 gain access to the circulation by the thoracic duct. 



2. F. diurna. — Adult form doubtful. Accord- 

 ing to Annett and Button it is F. loa. 



3. F. Persians. — The adults were found by 

 Daniels at the root of the mesentery, behind the 

 abdominal aorta, and beneath the pericardium. 



4. F. ozsardi. — Adults found by Daniels 

 in the sub-peritoneal tissue. 



5. F. demarquaii. — Adults doubtful. A 

 female form has been described differing slightly 

 from that of F. ozsardi 



6. F. loa. — Adults found in the subcutaneous 

 areolar tissue, also in the eyelids, and beneath the 

 conjunctiva. 



7. F. megalhaesi. — Adults only known, found 

 in the left ventricle of the heart by Figueira de 

 Saboia. 



8. F. gigas. — Adults unknown. 



