PINEAL EYE IN LACEETILIA. l9S 



The same structure is present in Gecko verus and Gecko 

 mauritanicus. 



Ameiva corvina. 



Ameiva externally agrees with Platydactylus in the 

 absence of a modified scale to function as a cornea ; the skin 

 of the head is also easily removable, not being attached in the 

 position of the foramen, which is also wanting in this species. 

 I have not yet examined it by means of sections, but as far as 

 can be told it agrees with Gecko. 



Anolis, PI. XV, fig. 11 ; PI. XVII, fig. 24. 



It is not my intention in this paper to describe the structure 

 of the eye of A noli s in any great detail, as before long I hope, 

 by the kindness of Mr. J. Gardiner, to be enabled to describe, 

 by means of specimens prepared carefully by him, the eyes of 

 several species of Anolis from the Bahamas. The eye of one 

 specimen has, however, been figured viewed as a solid object 

 from beneath (fig. 11). The brain membranes are represented, 

 the dura mater having branched pigment-cells scattered over it, 

 and having a specially dark ring around the margin of the 

 parietal foramen in which lies the eye. The latter is somewhat 

 elliptical in shape, its long axis lying in the same line with 

 that of the head : the eye is compressed dorso-ventrally, and 

 when compared with the organ in Varanus bengalensis (fig. 

 12), placed by its side, the rods are seen to be much larger than 

 in the latter ; the cavity within the optic vesicle, whose size is in- 

 dicated by the circular space bounded by the inner ends of the 

 rods, being hence considerably less in Anolis than in Varanus. 



Fig. 24 (PL XVII) is a drawing of the eye of another species 

 of Anolis from the West Indies. The organ lies in the 

 foramen with its upper surface close beneath the surface of 

 the head. Its shape is unlike that of any form described 

 hitherto, being elongated in a dorso- ventral direction. The 

 lens is cellular and its hinder border is deeply convex towards 

 the cavity of the vesicle, calling to mind somewhat the shape 

 of the structure in Hatteria; in the optic axis certain of the 



