134 GENETIC STUDIES ON A CAVY SPECIES CROSS. 



Plate 6. Photographs of humeri and femora in the parent species and hybrids. 



Fig. 34. cf 1, the original wild male ancestor of all wild and hybrid animals in these 

 experiments, 

 cf 24, pure wild son of cf 1. 

 cf 23, ^ wild hybrid, 

 cf 151, J wild hybrid. 

 cfl92, I wild hybrid, 

 cf 86, guinea-pig male. 



35. 9 3, the original wild female ancestor of all wild and hybrid animals in these 



experiments. 

 9 22, ^ wild hybrid. 

 9 90, i wild hybrid. 

 9 207, i wild hybrid. 

 9 87, guinea-pig, female. 



36. d^l, the original wild male ancestor of all wild and hybrid animals in these 



experiments. 

 d^24, pure wild son of d^l. 

 0^23, I wild hybrid, 

 cf 151, 5 wild hybrid. 

 cf 128, i wild hybrid, 

 cf 2304, guinea-pig male. 



37. 9 3, the original, wild female ancestor of all wild and hybrid animals in these 



experiments. 

 9 75, h wild hybrid. 

 9 87, I wild hybrid. 

 9 108, i wild hybrid. 

 9 12600, guinea-pig female. 



Plate 7. Photographs of scapulae and tibiae in the parent species and hybrids. 

 Fig. 38. cf 24, pure wild son of cf 1. 

 cf 10, ^ wild hybrid, 

 cf 151. i wild hybrid, 

 cf 126, i wild hybrid, 

 cf 2034, guinea-pig male. 



39. 9 3, the original wild female. 

 9 69, i wild hybrid. 



9 208, i wild hybrid. 

 9 87. guinea-pig female. 



40. (fl, the original wild male. 

 d^24, pure wild son of cf 1. 



. 0^23, ^ wild hybrid, 

 cf 120, i wild hybrid. 

 c?246, i wild hybrid, 

 cf 12267, guinea-pig male. 



41. 9 3, the original wild female. 

 9 75. 5 wild hybrid. 



9113, \ wild hybrid. 

 9 208, i wild hybrid. 

 9 12601, guinea-pig female. 



Plate 8. Camera-lucida drawings of the nasal-frontal sutures in the parent species and 

 ^ wild hj^brids. 

 Fig. 42. Tame guinea-pig, C. porcellus. 



43. Wild guinea-pig, C. rufescens. 



44. 5 wild hybrids. 



Plate 9. Camera-lucida drawings of the nasal-frontal sutures in the \ and | wild. 

 Fig. 45. \ wild. 

 46. i wild. 



Plate 10, Fig. 47. Camera-lucida drawings of the nasal-frontal sutures in the yV wild hybrids. 



