464 Mr. H. A. Baylis on new 
behind the female glands. The cirrus-sac measures about 
O'l mm. x 0°038 mm., and curves from the genital pore 
towards the front of the segment. The ovary is divided into 
two more or less distinct portions, the vagina passing between 
them. The yolk-gland is posterior in position and is rather 
deeply lobate. 
7. Davainea vaganda, sp. n. 
Host: Haliaétus vocifer. (Sea-Eagle.) 2 
This is a very slender little form, with a comparatively 
large scolex. In general it approaches closely to D. spher- 
oides, Clerc, 1903 *, which is also parasitic in birds of prey, 
but it does not appear to be identical with that species. 
Davainea vaganda ; the scolex, highly magnified. 
' The present examples measure 2-3 cm. in length and have 
a maximum width (near the posterior end) of 0°55 mm. 
The scolex (fig. 5) measures 0°3-0°35 mm. across, and the 
diameter of the suckers varies from 0°11-0°15 mm. The 
latter are sometimes elongated in a transverse direction. The 
rostellum measures 0°22 mm. in diameter and is armed with 
numerous hooks 25 uw in length, arranged in two rows. - The 
hooks on the suckers, which are also very numerous, measure 
15 uw in length. 
* Rey. Suisse Zool. xi. p. 359. 
