ON AVIAN CESTODES. 859 
47. Contributions to the Anatomy and Systematic Arrange- 
ment of the Cestoidea. By Frank H. Brepparp, M.A., 
D.Sc., F.R.S., F.Z.8., Prosector to the Society. 
[Received May 65,1914: Read June 9, 1914. ] 
(Text-figures 1-11.) 
XIV. ON A NEW SPECIES OF RHABDOMETRA, AND ON THE 
PARUTERINE ORGAN IN O7IDIT_-ENIA. 
INDEX. 
Page 
Description of Rhabdometra cylindrica, sp. n. ............... 859 
Paruterine Organ of Otiditenia ewpodotidis Beddard ...... 879 
I have recently obtained a considerable number of examples of 
a Tapeworm from an African Partridge, Caccabis melanocephala, 
which [ refer, temporarily at least, to the genus Rhabdometra, 
though a closer comparison of this worm with the known species 
of Lhabdometra may ultimately necessitate its separation from that 
genus. The worm occurred in the Partridge associated with 
several other species, and I found always a relationship in numbers 
between the different forms which inhabited that bird. I examined 
altogether five specimens of the Caccabis in three of which were 
found examples of the Rhabdometra. In two examples there were 
a large number of specimens of the Rhabdometra, and in the other 
example only two specimens. The birds, which were infested by 
many specimens of Ahabdometra, contained also apparently only 
one representative of other species of Tapeworms. In the one 
ease it was a Davainea and in the other a Cotugnia (¢?) In the 
bird where there were only two Lhabdometra there were many 
Davainee. 
The general appearance of this worm is indicated in text-fig. 1. 
It is long and slender; when alive the longest examples were 
fully six inches or so in length. In spirit the dimensions are 
somewhat lessened. This great length is accompanied by only a 
small diameter; the width varies from something under one 
millimetre, to a little over a millimetre. The greatest diameter 
was anteriorly in the body but some way behind the head; here 
the proglottids are broader than long. ‘The scolex as a rule 
appears to be a little less in diameter than the ensuing region of 
the .strobila. But occasionally, as depicted in text-fig. 1 A, the 
scolex stands out as a globular body followed by a constriction. 
In an examination of the living worms I noted one example in 
which there was no neck, an unsegmented region following upon 
the scolex ; and I have one mounted preparation (represented in 
text-fig. 2), where the same feature is to be seen. But I have no 
note as to whether these examples were the same. As a general 
Proc. Zoou. Soc.—i914, No. LVIII. 58 
