Proc. Roy. Socy. of Edin. ] 
[Vol. XXV. 
Fig. 4. — Ankylostoma Caninum , ova , of 
in various stages of development, 
x 200 diameters. 
Fig. 2. — Ankylostoma duodenale 
(human), x 12 diameters. 
Prof. Thomas Oliver. 
