390 Coe and Kunkel— California Limbless Lizard. 
Paraphysis.—TVhe paraphysis, or choroid plexus of the third ven- 
tricle (fig. 44, py) is in general similar to the post velar arch, but 
differs from the latter by becoming more branched distally and more 
tubular in shape. It extends dorsal to the post velar arch and back- 
wards till it lies over the epiphysis (fig. 48, py). The epithelium of 
this sac resembles the ependyma more than do the cells of the previ- 
ously mentioned region, but in general the cells of the paraphysis are 
larger and the nuclei are arranged more regularly (fig. 44, py). 
The two cavities of the post velar arch and paraphysis are appar- 
ently unconnected, although from a close study of sections it is 
possible that there is a very small secondary opening between the 
two near the distal end of the post velar arch. 
E/piphysis.—TVhe epiphysis (ep) of Anniella is very similar in 
structure to that of Anguis. It is a hollow oval vesicle of somewhat 
larger size than the pineal eye, but showing considerable variation in 
extent. It is situated in the middle line and is inclined posteriorly 
so that although the whole structure lies behind the posterior com- 
missure, its long axis, produced ventrally, passes between the superior 
and the posterior commissures. The epiphysis thus rests upon the 
anterior part of the optic lobes in the middle line and in the posterior 
portion of the pineal body as a whole. 
The form is quite regularly oval and the walls are of uniform thick- 
ness throughout, so that the cavity of the vesicle is also quite 
regular. In several of the series of sections examined, the cavity of 
the epiphysis exhibited, near the distal end on the anterior side, a 
slight depression as if a portion of the vesicle had been pinched off. 
This scar resembles quite closely that figured by Klinckowstrém 
(793) in Zgwane at the pot where the pineal eye is cut off from the 
pineal body in the development of the organs. The epiphysis and 
neighboring parts are all supplied by large blood vessels and held in 
place by a great amount of connective tissue which gives the pineal 
body its characteristic external form. 
Histologically the epiphysis resembles very closely the pineal eye 
devoid of pigment (fig. 46, ev). It is made up of several layers of 
cells, of which the innermost are tall, slender columns with oval 
nuclei toward their outer ends. At the bases of these tall columnar 
cells is an irregular row or two of closely packed oval nuclei. 
Externally is a single layer of more cuboidal cells, very similar to 
those of the pineal eye, possessing spherical nuclei which stand out 
very clearly, being well separated from each other. The free borders 
of the innermost layer of cells show numerous cilia-like processes 
