MALARIA EXPEDITION TO NIGERIA 35 
3. A band across the worm about 4 /x wide — distance 62*2 (corresponds 
in position to that of the highly refractile granule seen in fresh 
specimens. 
4. A slight lateral bay, distance 83*7. 
Filaria bibulbosa. Nov. Sp. 
Definitive hosts : Cinnyris fuliginosa. 
Sites. Subcutaneously, in various positions. The worms generally occurred 
in pairs, male and female together. Our collection contains a single male and female 
in one position from one bird, and a single male from another position : this bird 
also contained adults. Two females were found in one bird of the same species, 
which also contain F. spiralis. 
The female is a long, thin, whitish, smooth worm, both ends of which are 
bulbous. Its length varies from 20*7 to 22*7 mm. ; its breadth is about 0*17 mm. 
r- > r 1 , O'OQ, CVIO, CT2Q, / 
Lobb s formula : — — — 7 
, 0-05, 0-05, 0-05, O'OO 
The cuticle is somewhat thick, smooth, not striated. There is a slight narrowing 
for a neck (0.13 mm. wide) separating off the bulbous head end (o - 1 7 mm.) 
(plate VIII, fig 4). The mouth is terminal ; no papillae nor other appendages 
discernible. The oesophagus is straight, has no bulb; length 0-25 mm. The anus 
(plate VIII, fig. 5) is terminal and central, and is surrounded by four small lips. 
The vulva is 0-65 mm. from the anterior end : it is situated on a low conical papilla. 
The vagina is directed backwards, but may coil forwards as in other filariae. The 
uterine horns resemble those of others previously described. The two extreme ends 
are bulbous; no 'pylorus' could be made out. 
The male is smaller and thinner than the female, otherwise similar in 
appearance ; the tail end is not incurved. Length 8 - 6 mm. ; breadth 0-09 mm. 
Cobb's formula : , 1 86 ,^26, 50, — t — 
— 0-93, 0,93, 0-93, 0-93 
Width of head cri : of neck 0*07 mm. The head end, mouth and oesophagus are 
similar to those parts in the female (plate IX, fig. 1). Posteriorly the dorsal 
surface is rounded off to meet the ventral surface at an angle, at which the anal orifice 
is situated (plate IX, fig. 2). The region round the aperture is slightly flattened. 
In both of the specimens in our possession, one of the spicules of this worm is 
extruded through the orifice. It is curved and sharply pointed ; the other appears to 
ensheath the former. Only one small (probably a pair) post-anal papilla can be 
discerned. The reproductive tube is similar to that of the other filariae. 
The embyros are found in the blood, both peripheral and central. Thev 
have no sheath : they are capable of progression in both directions, exhibiting sinuous 
movements (plate XIII, fig. 6). Length 117-4 breadth 4-9 /u. The body is plain 
