20 



21 



22 



24 



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

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

 Fig. 34) x Cavia cutleri, adult. 



