Entozoa from Birds in Uganda. 463 
12 uw long, nearly all of which, however, have been lost. The 
rostellum measures 0°08 mm. in diameter and bears an 
enormous number of extremely minute hooks, the length of 
which is about 8 yu. 
The neck, which is well extended, is unsegmented for a 
distance of about 1:2 mm. behind the scolex. The mature 
segments (much contracted) are extremely short and broad, 
and have greatly overlapping margins posteriorly and laterally. 
The longitudinal musculature is very powerfully developed 
‘dorsally and ventrally, consisting of a thick layer of irregu- 
larly anastomosing fibres. 
The ventral excretory vessels are connected at every 
segment by a transverse vessel, which is about half as wide 
as the medullary portion of the segment itself. 
There are twenty or more testes in each mature segment, 
extending in a series right across the medullary parenchyme. 
The cirrus-sac and vagina open into a common genital 
cloaca (fig. 4, Cl.), the proximal portion of which has a very 
thick muscular wall, and the distal portion is non-muscular. 
The muscular portion is about 0°06 mm. long, the non- 
muscular about 0°05 mm. The dimensions of the cirrus-sac 
are 0°125 mm. x 0°06 mm. 
The gravid segments contain numerous egg-capsules 
enclosing four or five eggs each. ‘The onchospheres measure 
only about 15 mw in diameter, 
6. Davatnea sp. 
Host: Bleda pallidigula. 
There is a single fragmentary specimen from this bird, 
to which, owing to its incompleteness, it is not proposed to 
attach a specific name. 
The length of the fragment is about 15 mm. and its greatest 
width 0°9 mm. The scolex (contracted, and with retracted 
rostellum) measures 0°25 mm, across. The diameter of the 
suckers is 0°075 mm. and that of the rostellum about 0°1 mm, 
The size of the hooks on the rostellum has not been made 
out ; those on the suckers are about 13 yu long. 
The neck (rather contracted) is unsegmented for about 
0-4 mm. behind the scolex. The segments are broader than 
long throughout the fragment, which, however, lacks gravid 
segments, ; 
The earliest rudiments of genital organs appear at about 
the ninetieth segmenth. The genital pores are strictly 
unilateral. The testes number twenty to twenty-five, and 
are arranged mainly in two lateral groups, with a single row 
