F. J. Meggitt 
o 
longer and shorter forms alternating. Rostellum absent (?). Suckers unarmed, 
pigmented. Calcareous corpuscles absent anteriorly. Genital pores unilateral, 
posterior. Cirrus-sac reaches ventral excretory canal. Ova 0-052 mm. diam., 
8-12 in each capsule. 
Host. Struthio molybdophanos Reichen, S. australis Gurn. 
Literature, von Linstow, 1893 (Taenia struthionis). 
Blanchard, 1899a ( Davainea- struthionis). 
Hungerbuhler, 1910 ( Davainea- struthionis). 
D. becldardi, n. sp. 
Length ? , greatest breadth of proglottides 3 mm. Scolex 1-3 mm. diam., 
globular, with rostellum armed with 130 hooks 0-085-0-088 mm. long, in two 
rows. Suckers unarmed. Calcareous corpuscles numerous in scolex. Genital 
pores unilateral, posterior. Cirrus-sac reaching to nerve-cord. Ova in groups 
of 5-8 in capsules extending laterally to ventral longitudinal canal. 
Host. S. masaicus. 
Literature. Present paper. 
Zilluf, 1912 (Davainea struthionis). 
Davainea sp. 
The scolex and anterior portion of the strobilus were not seen. The inner 
longitudinal musculature (Plate I, fig. 5) consists of two layers, an inner 
and an outer, separated by a band of very weak transverse muscles. The 
inner longitudinal muscles form a single row of bundles, each composed of 
many (25-40) separate fibres; in some cases the bundles are entirely distinct 
one from the other, in others so crushed together that they appear as one 
continuous layer. Normally there is a certain amount of intermingling but 
the limits of the individual bundles can usually be ascertained. This layer 
is bounded internally by a strong band of transverse muscles. The outer 
longitudinal muscle layer is much weaker and the bundles more scattered 
than is the case with the inner. Its inner limit is formed by scattered bundles 
invariably distinct one from the other and consisting of but few fibres (3-6). 
From this, smaller bundles and isolated muscle strands are strewn through 
the cortex to the limits of the cuticula, the stronger muscle groups being the 
more internal and the fibres becoming successively weaker the more they 
approach the cuticula. In addition to these layers, a plate of dorso-ventral 
fibres separates each proglottis from its neighbours. 
The excretory system consists of two longitudinal vessels only, united 
posteriorly in each proglottis by a commissure. Dorsal longitudinal vessels 
could not be seen. 
The genital pore (Plate I, fig. 7) is unilateral, at the posterior three- 
quarters of the proglottis margin. The genital cloaca is comparatively shallow 
and leads diagonally and anteriorly into the proglottis. The cirrus-sac is long 
and slender, only reaching to the nerve-cord, and of very feeble muscular 
