E. W. BERGER ON THE CUBOMEDUSL. 53 
dark, but just how this is accomplished—whether the whole cell with 
its nucleus takes up a deeper position, the cell substance at the same 
time collecting in the region about the nucleus, as shown in Fig. 5 
and the diagram (Fig. 22), I cannot with certainty state. It would 
seem, too, as though the pigment became less in the cells exposed to 
darkness, for I rarely, even in the most retracted heavily pigmented 
series, saw the pigment to extend farther towards the nucleus than 
commonly. The time of keeping in the dark, prior to fixing, varied 
from three-fourths of an hour to one and one-half hours. I could 
not bring the amount of retraction into relation with the time of 
exposure, except that in general the retinas longest exposed showed 
the greater amount of retraction. 
(d) The tissue underlying the retina is described by former 
observers (Claus, Schewiakoff, Conant) as composed of nerve-fibers 
and ganglion cells. I cannot give it any other interpretation, but I 
must add that the supposed ganglion cells are seen only as nuclei, 
no cell bodies ever being demonstrable in any of my sections. Conant 
also recognized no cell bodies. Occasionally, as in Fig. 7, long fibers 
could be traced for some distance in this subretinal tissue, in some 
instances quite to or from a visual cell. Pigment was not regularly 
observed in this tissue, as Schewiakoff describes, and when present I 
believe it has been dissolved in from the pigmented zone. 
(e) Schewiakoff describes the retina (my pigmented and nuclear 
regions) as composed of spindle-shaped visual cells (my pyramid 
cells?) alternating with pigmented supporting cells (long pigment 
cells), with the nuclei of the former lying more centrad than those of 
the latter. The visual cells are pigmented only at their periphery, or 
surface, leaving an unpigmented axis, while the supporting cells have 
pigment throughout their whole substance within the pigmented 
zone. Distally, the visual cells have hyaline rods, or fibers, which 
extend into spaces in the vitreous body, and pass through this and 
the capsule to the lens. The vitreous body is described as homogene- 
ous, except the spaces for the visual rods, and a secretion from the 
retinal cells. 
It will thus be seen that my results are quite different from 
those just described. I find the vitreous body to be composed of 
prisms and pyramids with axial fibers, while the long pigment 
cells (supporting cells of Schewiakoff) are continued into the 
vitreous body, and becoming narrowed into a non-pigmented fiber, 
