64 FERXANDUS PAYNE. 



toward the anterior portion where the layer becomes thicker, the 

 radial diameter becomes much the greater. The greatest thick- 

 ness of this layer is near the lens, where it measures 68 //. The 

 outer surface of the pigment cells - - that which lies next to the 

 choroid--is smooth and slightly convex. The inner surface, on 

 the other hand, is very irregular. The cells at this place are 

 very densely laden with pigment and prolonged into filamentous 

 processes which extend between and amongst the cones. In 

 fact, the cones may be said to be imbedded in the pigment cells. 

 This layer differs but little from that of Auolis, except at the 

 anterior part of the eye where it becomes much thicker. 



The Cones. --No rods are present. The cones (2, Fig. 3) 

 consist of an upper and a basal portion. The basal part is ellip- 

 tical in shape and stains uniformly throughout, while the outer 

 portion is longer and somewhat triangular in shape, with the 

 smaller side of the triangle resting on the inner elliptical part. 

 This layer measures io// in depth while the same layer in Anolis 

 measures 1 3 //. 



The Outer Nuclear Layer. - - This layer is made up of a single 

 stratum of nuclei with small dark nucleoli (3, Fig. 3). Some of 

 these nuclei are almost spherical, while others are oval in shape. 

 They are connected with the cones by broad processes which 

 stain darkly. These processes may be very short, in which case 

 the cone comes in close proximity to the nucleus ; or they 

 may be drawn out into filaments as long as or longer than the 

 nuclei themselves. From the inner part of the nuclei extend 

 processes which broaden toward the base and send numerous 

 ramifications into the inner stratum of the outer reticular layer. 

 There is a striking difference here between this eye and the normal 

 one. The processes from the base of the nuclei pass straight 

 through the outer reticular layer while in my sections of the 

 normal eye, they pass through at an angle of about 45 (3, 



Fig- 4)- 



The Outer Reticular Layer. - - The outer reticular layer (4, Fig. 

 3), is penetrated by the processes from the nuclei of the outer 

 nuclear layer and by a few Mullerian fibers. If processes from 

 horizontal cells are present they were not brought out by the 

 method of staining which was used. Again, there is but little 



