"■^s^S 



"ig. 20, half-grown guinea-pig, race C. Figs. 23, 24, male and female Cavia cutleri, adult 

 Fig 



Fip-. 34^ X Cavia riitleri. adult 



22, Fi hybrid, race C x Cavia cutleri, adult. Fig. 21, Fi hybrid, race B (Plate 5 



