40 THOMPSON YATES LABORATORIES REPORT 
specimens from the same bird. Average 43 /m (3 7*5 to 61 /u). Breadth 6-6 ix. The 
nuclei which are very small, stain very deeply. At the head end the column of 
nuclei breaks into two lines to form a 'bay.' The tail end tapers in the last sixth 
to about one-half of its width, and then terminates in a small bulbous end. There 
is a very thin cuticle. 
' Spots.' These can be distinctly made out, only one is constant. 
1. A small irregular transverse slit, at distance 25 per cent, of length of 
the worm. 
2. A slight lateral bay at 33-8. 
3. A band across the worm at distance 6o"0. This is the constant spot 
and a characteristic of stained specimens of this embryo. 
Filaria calabarensis, Nov. Sp. 
Definitive host not yet identified. 
The embryos were found in central and peripheral blood. In some blood 
specimens (plate XII, fig. 3) these embryos occurred alone ; in others, from other 
birds, they occurred with F. bibulbosa and F. fahiformis. They were present in five 
birds out of nine examined. Stained specimens only available for description. 
Length 163/x; breadth 4^1, No sheath, but the thin cuticle shows very slight 
striation. 
The anterior extremity is rounded, and there is a 'bay '-shaped opening in 
the column of cells, which is thus bifid. The uniform width of the worm is 
maintained up to the position of the third 'spot' described below, where the worm 
begins to taper to a very fine point. 
The following 'spots' are observed: — 
1. A small anterior central irregular 'spot,' distance 24-2 per cent, of 
length from the anterior end. 
2. A shallow lateral 'bay,' at 34"6. 
3. The largest and most distinct of the 'spots,' roughly diamond-shaped, 
at 6o-8. 
4. A lateral break, occurring at the same side as the second, at 82-8. 
A Filaria, the adult male of which alone was found; 
FEMALE AND EMBRYOS NOT OBSERVED 
Filaria phoenicopteri. Nov. Sp. 
Definitive host : African Flamingo. 
The Flamingo had been skinned and cut into pieces before the time of our 
examination. Five male worms were found under the skin and on the muscle fascia ; 
the examination of the available blood showed the absence of embryos. 
