EXTENDED SERIES. 



59 



III. Pink-eyed Black Agouti, YBBrDpA (Fig. 3). 

 Eyes very deep pink. Ears apparently unpigmented. Hairs on ventral surface dull yellow 

 with bluish base, showing the presence of the agouti pattern. Dorsal hair closely 

 resembling that of the dark-eyed brown agouti form to the unaided eye. More yellow, 

 however, seems to be present in the coat, though it has been seen that this is not 

 because of an increased amount of yellow pigment. There is a tuft of light hairs at 

 the base of the ears. The hairs directly around the anus, however, resemble the other 

 ventral hairs so closely as to be indistinguishable from them. 



Pink-eyed black agouti x pink-eyed black agouti. 



Ckoss 29. One or both parents homozygous. YJiroBiDipoAi x Y-iBr.BiD-ipiAi. Expec- 

 tation, all pBAg. 



Ckoss 30. Both parents heterozygous in black. YzBriBDipiA? x Y-tBriBDipiA-i. Expecta- 

 tion, 3 pBAg, 1 pBrAg. 



Cross 31. Both parents heterozygous in black, density, and agouti. YzBroBDdpzA x 

 YiBnBDdptA. Expectation, 27 pBAg, 9 pdBAg, 9 pBrAg, 9 pB, 3 pdB, 3 pdBrAg, 

 3 pBr, 1 pdBr. 



Pink-eyed black agouti x black. 



Cross 32. Pink-eyed black agouti heterozygous in agouti crossed with homozygous black. 

 YjBnBiDiPtA xYzBrADoPi. Expectation, 1 BAg, 1 B. 



