SBHA-FISILERIES LABORATORY. 439 
are figured, and I have failed to find the structures 
described in my sections, which agree with those of Hesse. 
Hyde describes the rod cells as being simply supporting, 
and not visual sensory cells, and, further, that it is the 
inner interstitial cells (which lhe between the rod cells) 
that are continuous with the axial fibril of the rods on 
the one hand and the optic nerve on the other. ‘The rods, 
however, as above stated, are undoubtedly continuations 
of the rod cells, and though Methylene blue may be 
perfect for nerve fibrils, it cannot alter this fact, which 
has been observed by all observers in teased preparations 
and sections. Any continuations of the inner interstitial 
cells penetrating the outer sieve membrane will lie, 
therefore, between the rods, just as the former themselves 
lie between the rod cells. 
In addition to the normal rod cells with their rods 
which have been considered above, there is a peripheral 
region in which rod cells are present which differ slightly 
in structure from the others and do not bear rods at their 
bases (fig. 29, . C. p.); these were called Pseudoretino- 
phorae by Patten. They are regarded by Hensen as 
young rod cells, and Schreiner states that he found them 
to be more numerous in young specimens than in the 
adult. 
So far we have only considered the rod cells and the 
rods. In addition to these, the retina is made up of a 
number of other cells which form a definite band between 
the rod cells and the septum, and another layer, previously 
mentioned (inner interstitial cells), which he between the 
rod cells. Patten classified all those between the septum 
and the rod cell layer as belonging to the outer ganglionic 
layer, and the others to the inner ganglionic layer. 
Rawitz also classified all these cells together as ganglion 
cells, and later Schreiner describes the outer ganglionic 
