F. J. Meggitt 
i 
for it to be a temporary structure or for it to be split up into secondary 
capsules as in D. polycalceola Jan. A similar case has been described by 
Mola (1907 a, p. 578) for D. hertwigi : “La vasta cavita uterina e subdivisa 
imperfettamente in numerosa e piccole cellette, da tessuto parenchimatoso, 
nelle quali si trovano le uove in numero di 1-3 con le larve esacante.” 
In comparing this species of Davainea with others, the one it most re¬ 
sembles is the previously described D. beddardi. In both species the unilateral 
Text-fig. 1. Rostellar hooks of Cestodes from the ostrich. 
* 
a, after Parona; b, after von Linstow; c, author’s figure. 
Text-fig. 2. Proglottis of Davainea sp., filled with egg-capsules (e). 
genital pores are situated posteriorly along the proglottis margin, the capsules 
each contain approximately the same number of eggs and extend laterally 
beyond the longitudinal excretory vessel, and the relative length of the 
cirrus-sac (only reaching the nerve-cord) is the same. On the other hand they 
differ markedly in outward appearance and width of the proglottides, in the 
number of testes— D. sp. having approximately twice as many as D. beddardi — 
and in the cirrus-sac being further posterior in the former than in the latter. 
