30 
THOMPSON YATES LABORATORIES REPORT 
2. A clear sometimes lateral, sometimes transverse spot ; distance 35.3 ; 
constant. 
3. A long space in which the nuclei are loosely arranged, often 
anteriorly and posteriorly ending in a clear space, with the nuclei 
more densely arranged in between ; distance 66*7 ; constant. 
4. A small spot only occasionally seen, at 76 ; sometimes merges into 
the third spot. 
5. A very small lateral spot sometimes absent ; distance 8 9 ' 5 . 
Filarsa fiisiformis avium. Nov. Spec. 
Definitive hosts : Spermestus cucullatus. 
Hyphantornis. Sp. incert. 
Hyphantornis aurantus. 
Sites. The adult forms were found in the mesentery at the under surface of 
the liver and in the lung. The collection comprises two males, four females, and 
three immature worms: of which two were found in one bird; a single one in 
another ; another single one in a bird whose blood contained also embryos of F. 
spiralis and F. opobensis ; the others in a fourth. 
The female is a long whitish- worm, tapering gradually for some considerable 
distance at each end. The length varies from i 5*8 to 25*5 mm. ; breadth about 
o - 2 8 mm. ^ 
Cobb's formula : — — ' ' 
— 0-27, — 0-33-, — 
The cuticle is thin, smooth and transparent, somewhat thickened at the head end. 
The worms are all very opaque, so that but little of the internal anatomy can be 
made out in preserved specimens. At the anterior end (plate IV, fig. 2) which 
tapers to a breadth of 0*05 mm., is a slight appearance of a somewhat narrower neck. 
The oral orifice is terminal ; no papillae nor spines apparent. The vulva is at a 
distance of about 0*43 mm. from the anterior end. The anus is terminal. The 
posterior end also tapers considerably to 0*05 mm., and is then abruptly rounded 
off (plate IV, fig. 3). The ovum measures 27-7^ by 24-7 ^ and the length of the 
embryo inside the sheath in the preserved condition is 120 /m- The male, one 
specimen only of which is suitable for description, is 1 1 ■ 8 mm. long, o - i6 mm. broad. 
r , r , — — — > 5°> °' 88 
Iobb s formula : „ 
— — — 13% 0-47 
The cuticle shows no obvious striation. The head end resembles that of the female 
in shape ; it is provided with four small tubercles round the oral orifice. The posterior 
third of the worm tapers and coils, the coiling increasing towards the end of the 
tail. The anal orifice opens at a distance of about 0-14 mm. from the tip of the tail. 
There are two unequal spicules. The specimen is too opaque to make out any further 
internal anatomy. 
