Albert C. Eycleshymer. 315 
the dermis and there remain, but a considerable number can be followed 
directly, as they pass into the epidermis. 
The epidermis in addition to the increased number of chromatophores 
of this type also shows a considerable increase in the chromatophores of 
the second type which are as yet found in all stages of formation from 
the earliest condition to the condition shown in Fig. 7, which represents 
the complete formed chromatophore. 
CONCLUSION. 
The chromatophores found in the epidermis are of two kinds. One is 
but shghtly branched, taking on in general a pyramidal form. The other 
is highly branched, taking on a mossy appearance. The former becomes 
pigmented in sitw within the epidermis. They may be mesenchymal cells 
which have wandered into the epidermis before becoming pigmented, or 
they may be modified epithelial cells. The second type is derived from 
the mesenchymal cells which wander into the epidermis after becoming 
pigmented. 
