EXTENDED SERIES. 



75 



XIII. Brown, YBrDP (Fig. 13). 



Eyes deep brown; ears and tail brown pigmented. Hairs on the ventral surface are lighter 

 than those on the dorsal surface, and are dull dirty brown. Dorsal hairs deep, glossy 

 brown; lighter yellowish hairs occur, as in the black variety, at the base of the ears, 

 scattered on the flanks, sides, and feet, as well as around the anus. The skin is brown 

 pigmented. 



Brown X brown. 



Cross 92. One or both parents homozygous. YiPriD^PiXYiBriDiPi. Expectation, only Br. 



Cross 93. Both parents heterozygous for the color factor. YBriDiPi x YBriD^Pi, Expec- 

 tation, 3 Br, 1 W. 



Cross 94. Both parents heterozygous in dark eye. YiBviDiPp x YiBriDiPp. Expecta- 

 tion, 3 Br, 1 pBr. 



Cross 95. Both parents heterozygous in dark eye and the color factor. YBviDiPp x 

 YBriDiPp. Expectation, 9 Br, 3 pBr, 4 W. 



