MALARIA EXPEDITION TO NIGERIA 49 
Manson originally gave the name of F. ozzardi, are believed to be the parent forms 
of these embryos. Daniells compares the dimensions and characters of these adults 
with those of F. bancrofti and F. perstans ; the table we reproduce here :— 
Description of Filaria ozzardi embryo 
F. bancrofti 
F. perstans 

F. ozzardi 

mm. 
mm. 
mm. 
Length ... ... , ... 
85 to 90 
70 to 80 
81 
Greatest thickness ... 
crzo to 0-26 
o- 1 20 
o* 2 1 0 
Diameter of head 
0-055 
0-070 
0-050 
Diameter of neck 
0 - 04_Q 
o-oa 
j j 
j 7 
Distance from head — 
(1) Of vaginal outlet 
O-J IO 
o - 6oo 
0-710 
(2) Of ovarian opening 
0-920 
? 
0-850 
Distance from tail of anal papilla 
0-225 
0-145 
0-2 30 
Termination of tail 
Blunt, circular, not 
Slightly bulbous : 
Bulbous cuticle, 
bulbous 
covered with thick- 
ened cuticle pro- 
longed into two tri- 
angular appendages 
not thickened 
The embryos. We have been able to obtain only a very short and imperfect 
description of the embryo. Ozzard' and Daniells 2 described two embryos occurring 
in the blood of the aboriginal Indians of British Guiana — one a blunt-tailed worm, 
which has since been identified as F. perstans ; the other, ' sharp-tailed, is about the 
size of F. demarquaii and similar in shape, but has no sheath.' No periodicity was 
observed in either case. ' The tail (of the sharp embryos) tapers slowly for a great 
length of the body to a fine and quite sharp point; the embryos arrange themselves 
often in figures of 8. The specimens are longer, and often in their thickest part 
broader than in the blunt tails. The arrangement of nuclei is clearer and more 
distinct, and the whole worm less deeply stained. The nuclei (of the tail end) are 
always arranged in single file for a considerable distance, and the terminal one has 
its long axis parallel to the long axis of the worm ; while from this the body of the 
worm is continued for about croi to o - o2 mm. to its termination free from nuclei. 
There are no nuclei at the cephalic extremity ; the first ones seen are rod-shaped, 
with unstained spaces between, and at some little distance from the head is a gap 
(V-spot). 
Filaria magalhaesi 
The adult worms, which alone are known, are described by Magalhaes 5 as 
having been found lying in the left ventricle of a child at Rio de Janeiro. The two 
1. Ozzard, British Guiana Med. Annual, 1897. 
2. Daniells British Guiana Med. Annual, 1898. 
5. Magalhaes, Rio des Cursos Thtoricos e Prat da Fac. de Med. de Rio Janeiro, No. 3, An. Ill, 1896. 
G 
