20 
THOMPSON YATES LABORATORIES REPORT 
Filaria clava. Wed! 
The female only is known — length 16-18 mm., breadth 0*33 mm. Body 
filiform and of uniform thickness throughout almost the whole length. Head end 
conical ; posterior end rounded and bulbous. Mouth simple, small. Anus in a 
groove at the bulbous end. Vulva at 1*25 mm. from the anterior end. Ova 
36 m by 24 a contain a coiled-up embryo. Embryo 84 /ul long, 6 /x wide, thin rounded 
anterior end, pointed posterior end. Found in the peritracheal connective tissue of 
the domestic pigeon. 
Filaria mazzanti. Railliet 
The female which alone is known is 25 mm. long, 0*25 wide ; has a rounded 
anterior end, conical posterior end. Mouth simple, round. Anus terminal. Vulva 
triangular, 2 1 3 ^ from anterior end. Viviparous. Found under the skin of the 
neck of a pigeon, whose blood contain embryos some 1 8 5 M long with slightly 
pointed tail, the others 142 /u long with blunt tails. 
Filaria uncinata. Rudolphs 
Syn. Spiroptera uncinata, Rudolphi ; Dispharage a queue crochue, Railliet ; 
F. uncinata, Rudolph 1. Mouth has two lips with six papillae. The four sinuous 
cutaneous bands (characteristic of the Dispharagi Railliet 1 ) reach to within 2 mm. 
of the anterior end. On each side of the body a double longitudinal series of small 
spines extends almost to the caudal extremity ; in front, the spine ridges reach the 
dorsal surface and approach the mouth between the cutaneous bands. 
The male is 9-10 mm. long ; the tail shows straight lateral alae with vesicular 
edges. Four post-anal papillae ; the pre-anal five or six side by side, or seven or 
eight ; the principal spicule is long, incurved and dilated at its free extremity ; the 
other is thick and short. 
The female is 1 5 to 18 mm. long ; vulva is at about 1 mm. from the caudal 
extremity, which is curved. 
Life history. This has been worked out by Hamann z in Daphnia pulex 
(Rich). The adults occur in the oesophagus and ventriculus of geese and ducks in 
tubercles of different sizes which contain worms up to about 10 mm. in length, 
coiled together. The disease attacks the younger animals of late generations ; those 
of the first brood are unaffected, explained by the course of the development of 
Daphnia. This crustacean multiplies the whole year round, but mostly in the hot 
summer months, especially of July and August. The mature worms give rise to 
embryos which wander out of the tumour and may, either, come out by the 
oesophagus and mouth, or, more usually passed through the intestine, and escape 
1. Railliet, Zo r jl Medic ct Agric. Paris, 1S95, p. 542. 
2. Hamann, Central./. Bakt. 11. Paras., 1893, xiv, p. 555. 
