Alt—Histology of the Eye of Typhlotriton Spelaeus. 98 
is usually stated. The anterior surface is less curved 
than the posterior one.’’ It fills in my sections almost 
the whole space between the cornea and posterior sur- 
face of the iris, and the retina, except at its posterior 
pole where the retina has a funnel-like depression (cor- 
responding to the optic papilla in man) in front of the 
optic nerve. It consists of broad epithelial fibres with 
large oval nuclei. While in man the capsular epithelium 
reaches only a little ways back of the aequator of the 
lens, in Typhlotriton it lines the whole of the lens cap- 
sule. (See Fig. 8.) 
Whether there is any tissue, like the vitreous body 
of man, in the eye of J'yphlotriton I have not been able 
to decide. There is in many of my sections a small 
amount of amorphous tissue, stained slightly by eosin, 
situated in the funnel back of the lens; but it is impos- 
sible to state whether this is derived from vitreous body 
or from disintegrated nerve fibres coming from the retina. 
(See Figs. 1, 2, 9 and 10.) 
What I have stated thus far refers to the eyes of both 
larvae and adults. As already mentioned, I can find no 
material difference between the two states. If there is 
one it must be in larvae considerably smaller than the 
two which I had for examination. 
The only real difference I can find is that the adults 
have eyelids and a conjunctival sac. (See Figs. 3 to 8.) 
Two of my adult specimens have a small palpebral fissure 
which is centrally located. Towards what might be 
termed the outer and inner canthus the eyelids are united. 
In these specimens the upper lid overlaps the lower one 
in the palpebral fissure to quite an extent. (See Figs. 3, 
6,11.) Both lids contain the same small amount of sub- 
cutaneous pigment. ‘To both sides of the palpebral fis- 
sure the union of the two eyelids is for a certain distance 
an epithelial union only (see Fig. 13), but still further 
outward this gives place to firm tissue union. ‘The pal- 
pebral opening can be of little use as far as the admission 
of pictures from the outer world goes, especially since 
