4 
Tapeworms from Ostrich 
cirrus-sac: from the second it is distinguished by having the eggs enclosed in 
groups in capsules. Neither does it agree with any of the species of Davainea 
previously described from other hosts. For its reception therefore, there must 
be formed a new species, for which I suggest the name Davainea beddardi n. sp. 
after Dr Beddard whose paper has largely dissipated the confusion formerly 
associated with Parona’s D. struthionis. The following table gives the char¬ 
acters in which the three species differ one from the other. 
Scolex 
Rostellum 
Rostellar hooks (for 
shape see Text-fig. 1) 
Suckers 
Calcareous corpuscles 
Cirrus-sac 
Genital pore 
Eggs 
Host 
Davainea 
struthionis 
Parona 
2 mm. diam. quadrate 
Parona 
T2 mm. diam. Beddard 
present 
130,0-02-0-03 mm. long 
non-pigmented 
present in scolex 
reaches nerve cord 
in anterior part of pro- 
glottis margin 
singly in capsules 
S. camelus 
S. masaicus 
Davainea 
struthionis 
v. Linstow 
1*125-1*18 mm. diam. 
absent(?) 
164, 0-075-0-084 mm. 
lorfg 
pigmented 
absent from scolex 
reaches ventral longi¬ 
tudinal excretory 
vessel 
capsules contain 8-12 
S. molybdophanos 
Davainea 
beddardi 
n. sp. 
1-3 mm. diam. glo¬ 
bular 
present 
130, 0-085-0-088 mm. 
long 
non-pigmented 
present in scolex 
reaches nerve cord 
in posterior part of 
proglottis margin 
capsules contain 5-8 
S. masaicus 
In order that confusion may not be caused by the use of the same name 
for two separate species, I venture to separate von Linstow’s form from 
Parona’s under the name of Davainea linstowi and to give a diagnosis of the 
specific characters of each of the three species of tapeworms so far recorded 
from the ostrich. These characters include those mentioned by Dr Beddard 
and others taken from the original drawings and descriptions. 
D. struthionis (Parona, 1885). 
Length 270 mm., greatest breadth of proglottides 8*5-9 mm. Scolex 2 mm, 
diam., quadrate, with rostellum bearing a double circle of hooks 0*02-0*03 mm. 
long, the shorter and larger hooks alternating. Suckers unarmed. Genital 
pores unilateral, anterior. Cirrus-sac reaching to nerve-cord. Ova 0*03 mm. 
long x 0*02 mm. broad, singly in egg-capsules extending laterally to ventral 
longitudinal canal. 
Host. Struthio camelus L., S. masaicus Neu. 
Literature. Parona, 1885 (Taenia struthionis). 
Beddard, 1915 (Davainea struthionis). 
Blanchard, 1891 (Davainea struthionis). 
' D. linstowi n. sp. 
Length 160-620 mm., greatest breadth of proglottides 4*43 mm. Scolex 
1*18mm. diam., armed with 164 hooks, 0*084-0*075mm. long, in two rows, the 
