Proc. Roy. Socy. of Edin."\ 
[Vol. XXV. 
Fig. 4. — Same specimen as seen in Fig. 3, when four and a half months 
old. (From a photograph by Mr C. A. Iv. Ball.) 
Fig. 5. — Two specimens of the fourth litter when a few weeks old. 
(From a photograph by Lafayette.) 
Prof. U. J. Cunningham. 
