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



less irregular than those along the mid-dorsal line and none shows 

 overlapping. They measure 0.248 mm. x 0.265 rnm- (Fig- 2). 

 Those scales on the lateral aspect of the body are almost circular 

 in outline and are arranged in two rows, vertical and horizontal, 

 the intersection of the two rows making an angle of about 58°, 

 and they measure 0.255 rnm. x 0.248 mm. (Fig. 3). 



The scales on the ventral aspect are larger and more closely 

 arranged, the caudal edge of each scale overlapping slightly the 

 cephalic end of the scale just behind it. The outline of the scale 

 is somewhat oval or circular and there is present a homy ridge or 

 keel extending down the middle which becomes more prominent 

 as the caudal border is approached. The scales of the region 

 measure 0.35 mm. x 0.36 mm. (Fig. 4). 



The scales on the tail differ markedly from those previously 

 described. They are hexagonal in outline and closely packed and 

 overlap each other to a greater extent than those on the ventral 

 surface. There is present a median ridge and the surfaces on 

 either side slope away from it. These scales measure 0.45 mm. 

 X 0.27 mm. (Fig. 5). 



The dorsal aspect of the head is made up of bilaterally symmetrical 

 plates of a more or less hexagonal form. Just posterior to the inter- 

 section of the mid-dorsal line and the posterior edge of the orbital 

 ridge is a marked pineal eye. The scales on the distended throat- 

 fan are widely separated and are flattened and somewhat conical 

 in shape. Those of the eyelids are so minute as to be barely visible. 



The color of the individual scales is the same as that described 

 for the various areas of the body. When a general color state is 

 assumed, for instance brown, isolated scales may be white, tur- 

 quoise blue, lighter or darker brown than the general hue, or even 

 green. 



Some extremely interesting features are noted in scales on the 

 various parts of the body when observed under the low power of 

 the microscope, by reflected and by transmitted light. The char- 

 acteristics exhibited by the scales present points of similarity, but 

 also some very marked differences. For these observations bits of 

 fresh skin were taken from different parts of the body and mounted 

 in glycerin and the appearance of the scales was studied both from 

 the external surface and from the internal surface. 



The external siu-face of the lateral scales appears yellow by 

 transmitted light. Scattered evenly throughout are somewhat 

 indistinct, pale brown, stellate-shaped bodies, the melanophores, 



