SHANK COLORS IN DOMESTIC FOWL. 25I 



Fig. 80. A vertical section of skin from the shank of a black 

 legged hen. Melanin pigment granules are scat- 

 tered thickly through both layers of the epidermis, 

 and melanin pigment cells in the Malphigian layer 

 and through the upper corium. Lipochrome pig- 

 ment is wanting. 



Fig. 81. A similar section from a green shanked bird. The 

 epidermis contains lipochrome pigment in both lay- 

 ers. The corium possesses large numbers of 

 melanin pigment cells in the upper region. Lipo- 

 chrome pigment is wanting in the dermis, and 

 melanin pigment in the epidermis. 



Fig. 82. This drawing shows a portion of a black spot (upper 

 left hand corner) on a green shanked fowl. Lipo- 

 chrome pigment is diffused through both layers of 

 the epidermis. Melanin pigments granules are 

 numerous in the epidermis of the spotted region, 

 and there are scattered melanin pigment cells in its 

 Malphigian layer. The unspotted portion of the 

 epidermis is free from melanin pigment. Many 

 melanin pigment cells He beneath the epidermis. 

 There is no yellow pigment in the dermis. 



Fig. 83. A vertical section through the skin of a dusky white 

 shank. Here melanin pigment granules are thinly 

 scattered through the epidermal layers. A single 

 melanin pigment cell lies in the rete layer, and simi- 

 lar cells here and there in the corium. There is no 

 yellow pigment in either dermis or epidermis. 



Fig. 84. A similar section from a dusky yellow shank. The 

 epidermis contains Hpochrome pigment, and melanin 

 pigment granules in small quantities. Melanin pig- 

 ment cells are sparsely scattered through the Mal- 

 phigian layer and the dermis. 



