PARKER, — Compound Eyes in Crustaceans. 
Fig. 73 
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PLATE VII. 
Mysis. 
A longitudinal section of an ommatidium. The numbers at the left of 
the figure indicate the levels at which the sections for Figures 75-89 
were taken. X 476. 
The distal face of a corneal facet, cleaned in potash and examined in 
water. X 475. : 
A transverse section of three ommatidia in the plane of the corneal hy- 
podermis.  X 475. 
A transverse section through the distal end of acone. 475. 
A transverse section through the proximal end of a cone and the adjoin- 
ing distal retinular cells. x 475. 
A transverse section similar to that shown in the preceding figure, 
except that it is depigmented and stained in Kleinenberg’s alum- 
hematoxylin. X 475. 
Figures 79 to 82 inclusive represent consecutive transverse sections through the 
region of the proximal retinular nuclei of four adjacent ommatidia. The 
centre of each ommatidium is indicated by the group of cone cells (cl. con.), 
and the corresponding ommatidia in different sections are designated by the 
same Roman numeral. The nuclei around ommatidium II. have been num- 
bered in Figures 79-81. Figure 79 represents the most distal section, and 
Figure 82 the most proximal one of the series. 
Fig. 79. 
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The bodies marked x and y are portions of nuclei the rest of which are 
correspondingly marked in Figure 80. X 475. 
A transverse section of the four fibres at the distal end of the rod (com- 
pare p. 102). Depigmented, and stained in Kleinenberg’s alum-hem- 
atoxylin. X 615. 
A transverse section of the rod at a slightly more proximal level than 
that shown in Figure 85. Depigmented, and stained in Kleinenberg’s 
alum-hematoxylin. X 615. 
A transverse section of the retinula somewhat distal to the distal end 
of the rhabdome (compare Fig. 90). Depigmented, and stained in 
Kleinenberg’s alum-hematoxylin. > 615. 
A transverse section from the region between the distal end of the rhab- 
dome and the proximal end of the rod (compare 86 in Fig. 90). De- 
pigmented, and stained in Kleinenberg’s alum-hematoxylin. XX 615. 
A transverse section through the rhabdome and surrounding retinular 
cells. X 615. 
A transverse section, at the level of the basement membrane, through 
the nerve fibres from a single retinula. Depigmented, and stained 
in Weigert’s hematoxylin. x 615. 
A transverse section through the fibres of the optic nerve at a level mid- 
way between retina and optic ganglion. Preparation as in Figure 
88. xX 615. 
A longitudinal section through the basal portion of one and parts of two 
adjoining ommatidia. Depigmented, and stained in Kleinenberg’s 
alum-hematoxylin. »X 615. 
A section cut in the same plane as that shown in the previous figure, 
but including only the proximal ends of two rhabdomes. Prepara- 
tion as in Figure 90. & 615. 
A cone viewed from the side. Isolated in Miiller’s fluid and studied in 
water. X 475. / 
