11 
hyaloid artery carrying blood and anastomosing with the iris—the 
ciliary processes being absent, 
Mittendorf has reported that about 1 per cent, of all patients 
coming to him for ocular affections exhibit minute dotted opacities 
on the nasal aspect of the posterior lens capsule. These dots are 
without the visual axis; they do not increase in size and do not 
interfere with vision. He regards them as remains of the fetal 
hyaloid artery or its connections on the posterior aspect of the crys¬ 
talline. 
The retina and optic nerve of birds are both highly developer] 
Fig. 3. — Section of the Ked-tailed Buzzard's eye, intended to show (at the 
large white detachment), the nasal fovea. 
and closely resemble the same organs in the Primates. The vas¬ 
cular supply to the retina is probably carried entirely by the pecten, 
although no direct connection with that membrane has been estab¬ 
lished. 
The macular region or visual area is plainly differentiated from 
the rest of the retina, and macroscopic sections generally show at 
least one well-defined, deep fovea. Writers 7 on this subject gen¬ 
erally refer to the double macula of certain birds. Of 102 species 
7. Gegenbaur: Vergleicliende' Anatomie, Bd. i (ISOS), p. 937, remarks that 
many birds possess two foveas, one in the nasal, the other in the temporal 
aspect of the retina. 
♦ 
