Entozoa from Birds in Uganda. 465 
The neck is very slender and is unsegmented for from 
0'4-1'0 mm., according to the state of contraction. The 
segments are broader than long throughout the  strobila, 
except in some cases the last three or four gravid segments. 
Rudiments of genital organs begin to appear at about the 
hundredth segment. The genital pores are strictly unilateral. 
The cirrus-sac measures 0°l mm. x 0°05 mm. The testes are 
very large and six to eight in number, 
8. Davainea bycanistis, sp. n. 
Host: Bycanistes subguadratus. (Hornbill.) 
This species reaches a length of about 14 em. and has a 
maximum width of 2 mm. The scolex (fig. 6) measures 
0:27 mm. across, and the diameter of the suckers is 0°088 mm. 
The latter are armed with several rows of hooks, 13 w in 
Fig. 6. 
Davainea bycanistis ; the scolex, highly magnified. 
length. The rostellum is 0°15 mm. in diameter and bears a 
double crown of hooks 15 yw long. 
Segmentation begins at about 1 mm. behind the scolex. 
The segments are broader than long throughout the strobila, 
except the last few gravid segments. The genital pores are 
strictly unilateral. ‘There are twelve to fourteen large testes 
in each mature segment, their diameter being about 0°075 mm. 
‘I'he cirrus-sace is rather elongate, has a muscular wall, and 
contains a very muscular cirrus. The dimensions of the sac 
are about 0°2 mm.X0°'062 mm. The female glands form a 
small compact mass in the middle of the segment. Each 
gravid segment contains some thirty egg-capsules, which 
measure about 071 mm. in diameter, and contain each four to 
