Ali—Histology of the Eye of Typhlotriton Spelaeus. 87 
2.) The next two in size had eyelids and a small pal- 
pebral fissure, the tipper eyelid, however, overlapped the 
lower one. (See Figs. 3,6 and 11.) In the two largest 
specimens I could not find the smallest palpebral open- 
ing. It seems that no light whatever could enter their 
eyes except after having passed through the semi-trans- 
parent lids covering them. (See Figs. 5, 8 and 12.) 
Unfortunately the preservation of the material for 
examination was not such as we are accustomed to with 
the material taken from man. One specimen was still 
alive when I got it. Yet, even in this animal’s eyes, into 
which the preserving and hardening fluids evidently did 
not enter in a sufficient quantity, certain post mortem 
changes took place. Another difficulty lay in the fact 
that the celloidin in which I embedded the decalcified 
heads for cutting did not penetrate into the interior of the 
eyes in such a way as to fill the cavities and give the 
whole a uniform firmness. In consequence the eyes were 
more or less shrunken and the tissues did not always lie 
in their natural positions and relations to each other. 
Some parts, like the uveal tract, were always more or 
less disintegrated. In quite a number of sections the 
erystalline lens fell out during the handling and stain- 
ing. I cut some of the heads vertically to the surface 
and some parallel to the surface, hoping to get in this 
way a more complete picture of the real conditions. 
In the two specimens which had as yet no eyelids 
(Figs. 1 and 2) the outer skin seems simply to pass over 
the eyes. But it shows decided structural changes in 
this ocular part, so as to be easily recognized as the 
cornea. While the epithelium of the skin in the neigh- 
borhood of the eye consists chiefly of cylindrical and 
goblet-shaped cells, it is suddenly changed into a strati- 
fied epithelium where it covers the eye. While in the 
four eyes without lids I can find no section in which 
the whole of this corneal epithelium is intact, on account 
of the lack of protection, yet larger portions, and espe- 
cially the peripheral parts, were in a larger number of 
