298 THE ANIMAL PARASITES OF MAN 



the day. The differentiation of Hanson's four species remains 

 uncertain as long as the adult stage is unknown. 



[Filaria ozzardi was discovered by Sir Patrick Manson in 1897 

 in blood films prepared by Dr. Ozzard from aboriginal Carib 

 Indians inhabiting the back country of British Guiana. At least 

 half of the slides examined contained larval filariae ; some slides 

 only one or two, other slides as many as forty or fifty. These 

 larval filariae were not all alike, they differed slightly in size and 

 in the shape of their posterior extremity. Five out of six 

 presented a blunt tail, the others had a sharp tail. Dr. Daniels 

 proved that the blunt-tailed larvae were the young of Filaria 

 Persians, because he found the adult F. perstans, both male and 

 female, at the post-mortem examination of two Demerara Indians, 

 whose blood, during life, contained both blunt and sharp-tailed 

 larvae. Later, Dr. Daniels found, at the post mortem of another 

 native in whose blood both the blunt and sharp-tailed larvae had 

 been found, a few adult specimens of Filaria perstans, and, in 

 addition, a female and portion of a male worm of a new species 

 closely resembling Filaria bancrofti in shape and size, but differing 

 from it on account of the bulbous termination of its tail. This 

 parasite was presumably the parental form of the sharp-tailed 

 larvae previously found in the peripheral circulation of the host. 



The larval form of Filaria ozzardi measures o - 2i mm. in length 

 by 0-005 mm - m breadth, it has a sharply-pointed tail and no 

 sheath ; it observes no periodicity. 



The adult forms have been found only once by Dr. Daniels in 

 the subserous connective tissue of the anterior abdominal wall. 

 The female measures 81 mm. in length by o'2i mm. in breadth. The 

 head has a diameter of 0-05 mm., the genital pore opens at 071 

 mm. from the head. At this point the diameter of the body is 

 0-12 mm. The anus is at 0*23 mm. from the tail. The tail is 

 bluntly truncated and slightly bulbous, it presents no cuticular 

 thickening. The diameter near the tip of the tail before ter- 

 mination is o'O45 mm. 



The male worm measures 38 mm. in length by O'lq mm. in 

 breadth. L. W. S.] 



LITERATURE. 



MANSON, P. On Certain New Spec, of Nemat. Haemat. occ. in America. (Brit. 



Med. Journ., London, 1897, &> P- l %37-) 

 DANIELS, C. W. Fil. and Fil. Disease in Brit. Guin. (Ib., 1898, i., p. ion. 



ii., p. 878.) 

 GALGEY, O. Fil. Dem. in St. Lucia. (Ib., 1899, i., p. 145.) 



