EYES OF CHRYSOCHLORIS HOTTENTOTA AND C. ASIATICA. 333 
embryo, its duct towards the exterior extending only a very 
short distance in front of the sac. That belonging to the 
other eye is, however, much more well-defined, and has a 
duct clearly leading on to the surface of the head. I have 
been unable to find any gland in this stage. 
The eyeball is somewhat more elongated than that in the 
younger stage, being ‘62 mm. in antero-posterior diameter, 
and “44 mm. in transverse diameter. 
The fibrous sclerochoroid is similar to that previously 
described, except that it is more strongly developed, and the 
choroid portion is less densely fibrous than the sclerotic part. 
The retinal pigment epithelium is well defined, though its 
pigmented area, as in C. hottentota, is in one eye (left) of 
this young individual much less extensive than in (a), being 
confined entirely to the posterior half, except in the median 
longitudinal line, where it extends round the front also. In 
the other eye (right) of this specimen the pigment is much 
more abundant, being only absent from the layer of pigment 
cells over a small circular area at the anterior end of the eye, 
much as in (a). In both eyes this pigment cell layer is absent 
in the median longitudinal line posteriorly, as in C. hot- 
tentota. 
At the anterior end of the eye in this stage also the 
continuity of the pigment layer with the other layers of the 
retina is clearly seen, the reflexion taking place at about one 
sixth of its length from the front of the eye. 
Passing over the anterior face of this layer is a membrane 
representing probably both internal limiting membrane and 
hyaloid membrane. This is continued back along the median 
longitudinal line to the level of the posterior gap in the pig- 
ment cell layer. There are associated with it remnants of 
optic nerve-fibres, but these are extremely indefinite, and are 
not continued outside the eyeball, there being no semblance 
of optic nerve. 
At the anterior end of the eye, filling the triangular space 
which is left in the median line in front of the reflexion of 
the pigment layer, and which one may regard again as the 
