1894.] Embryology. 81 
Very early some of these retinal cells form a rod at the free end and 
afterward isolated grains of pigment appear in these cells, near the 
rod end. Meantime the few large gland cells, in the retina, instead of 
forming rods form a secretion poured out between the lens and the 
retina. The lens grows enormously, has no longer any trace of its cell 
origin, and is believed to increase, in some way, by aid of the gland- 
ular secretion. : 
The remarkable gland cells that are mentioned above as occuring 
even in the youngest larva studied may be found in the adult. They 
have the important function of secreting the vitreous body. 
Each eye has one of these peculiar glands (they are not to be com- 
pared with minute gland cells seen in the retina) lying outside the 
wall of the retina though in its origin one of the mass of cells that gave 
rise to the whole eye. 
This gland is a large protoplasmic mass with two large nuclei and 
often numerous smaller nuclei and leads through the retina into the 
optic vesicle by a sort of duct or process. F 
One other point the author has elucidated is the so called ciliary 
body, which proves to be merely a part of the retina that developes in 
an isolated position at the edge of the cornea. 
It is apparent that as this eye arises quite independently of the brain 
and, as far as the authors observations go, of the epidermis also little com- 
fort is to be got from it for those who would reduce the Annelid eye to a 
simple epidermal thickening: they must fall back upon the statement 
that the ontogeny of this highly specialized eye in an apparently 
aberant group throws no light upon the phylogeny of the Annelid eye. 
