PLATE XI (continued). 
Fig. 
trom toad. a. Three rods; the majority are not so long as the 
longest. &. Size of pale yellowish globules attached to some of the 
rods. xX 450. 
11.—From alligator. a. Rods. 4. Fibrous layer of retina when fresh. 
c. Same layer with granular cells after six hours’ immersion in dilute 
spirit; the nerves have become varicose. xX 450. . 
12.—From chameleon. a. Rods. 4, Granular cells, with which are some 
larger-brain cells. ce. Nerve-fibres of retina. x 450. 
13.—From golden carp, Cyprinus auratus. a. Cylindrical rods. 6. Conoidal 
bodies, cones jumeaux, at first perfectly transparent. c. These same 
bodies, after a short time, or immediately on the addition of water, 
the lower bulbous portion swells, becomes granular, irregular, splits 
in the middle, forming the coffee-berry body, breaks up, and 
disappears, while the surmounting conical leg breaks off, splits into 
dises, as do the cylindrical rods, and disappears. d. Ovoid ceils of 
various sizes, of a dark fuscous colour; they resemble brain-cells. 
e. Nerve-fibres of retina. x 450. 
14.—From sand-dab, Platessa limanda. In this fish the cones are not 
numerous, the rods and granular cells are far more so. a. Rods. 
b. Conoidal bodies. x 450. 
15.—From litile weaver, Trichinus vipera. In this fish the cones are very 
distinct, and far more numerous than in the last, but very few have 
the clear conical leg, and for the most part they lie singly and not 
in pairs as is common in fish. The rods are neither numerous nor 
well developed. «@. Rods. 4. Cones, which in this and the last fish, 
if not in life granular, become so before they can be examined. x 450. 
16.—From whiting, Merlangus vulgaris, which is a good fish for examination, 
the cones being well developed, a. Small rods. 4. Cones with 
single bulbs and double conical legs, at first perfectly transparent 
and homogeneous, but in a very short time immersion in dilute spirit, 
or instantly on the addition of water, the changes shown at ¢ occur, 
and they disappear in granules. x 450. 
17.—From eel. a. Rods, which are numerous. &. Cones, which are not so 
numerous. c¢. Brownish red transparent cells, in character not unlike 
the coloured globules of birds, except that they contain a nucleus. 
They are not more than half the size of the blood-globules, and they 
are circular; on the other hand, they are much too large for the pig- 
ment-cells of the choroid, which in colour they resemble. d. Com- 
mencing change in rods or cones, which now (with 1-8) resemble, in 
size and form, au oatcorn. xX 450. 
18.—From cod, Gadus morrhua, where the retina is very thick and its ele- 
ments simple. @. Normal form and size of cone, the bulb is perfectly 
transparent and homogeneous; the conical process is single and has two 
transverse strix, where it soon breaks. 6. Cones altered a few hours 
after death. ¢. A cone seen to alter while under examination, a large 
granular vesicle formed in the middle, and at each end was a long fibre ; 
these subsequently swelled out, became granular, and disappeared. 
d. Inner surface of retina, some hours after death, showing the large 
flat nerve-flbres become greatly varicose; they are imbedded in a 
layer of granular cells, with which are also found many large traus- 
parent cells. x 450. 
