116 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Description of Plates 



Plate 7, Figs. 1-5 

 Camera-lucida outlines of scales of various parts of the body. 



Plate 8, Fig. 6 



(A) . External surface of the skin of the lateral aspect under low 

 power by transmitted light, showing yellow scales and indistinct 

 melanophores (M). 



(B). The same as above by reflected light showing the green 

 scales with areas of brown pigmentation. 



(C). Internal surface of the same skin by reflected light showing 

 the blue scales with distinct dark melanophores (M). 



Plate 8, Fig. 7 



(A). External surface of the skin of the ventral aspect under 

 low power by transmitted light showing the pale straw-colored 

 scales with their indistinct melanophores (M). 



(B). the same as above by reflected light showing the white 

 scales with indistinct blue melanophores (M). 



(C). Internal surface of the same by transmitted light showing 

 the straw-colored scales with their distinct melanophores. 



Plate 7, Fig. 8 

 Vertical section of a portion of the ventral scale (oil immersion) 

 showing the stratum corneiim (st. corn.), stratum germinativimi 

 (st. germ.), the leucophore layer (leuc), a single melanophore 

 (melan.), and the connective tissue (conn. tiss.). 



Plate 7, Fig. 9 

 Scraping of the stratimi comeum under oil immersion showing 

 a group of squamous cells with their stippled appearance. 



Plate 9, Fig. id (High Dry Power) 

 (A). Vertical section of a lateral scale in the green state by 

 transmitted light, freshly hardened with twenty per cent formalin 

 and unstained. This shows the transparent epidermis, the under- 

 lying layer of yellow oil droplets (0), the layer of leucophores (L), 

 the melanophores with their numerous branches (M), and the 

 underlying layer of connective tissue (C). 



(B). The same by reflected light showing the bluish-white 

 leucophore layer (L) and the black melanophores (M). The 

 latter appear blue when lying beneath the former. The yellow oil 

 droplet layer scarcely reflects any light. 



