204 
A. LIAUTARD. 
more prominent; its free border is almost concave ; its most in¬ 
ternal part only is straight and goes to meet the extremity of the 
superior border to form the obtuse angle of the eye. The eye 
lashes of the lower lid are few and shorter than those of the 
superior one. 
In the thickness of the skin, besides long and stiff hairs are 
found tentacules analogous to those of the lips and chin. 
The external or temporal angle, or external commissure, unites 
by a short curve the free borders of the eyelids. Outside, the 
inferior lid seems to be covered by the superior, and thus the 
angle seems more acute than it really is ; a fissure running out¬ 
ward separates the two lids quite plainly. 
The internal or nasal angle, or internal commissure is round¬ 
ed and lodges a peculiar organ, black in color, or marbled witli 
white, of the size and convexity of a pea ; this is the carmculau 
lacrymalis, On a deeper plan one sees also the extremity of the 
free border of the membrana nietitans or third eyelid. 
The straight fissure which indicates the limit of the closed 
eyelids extends about one centimeter beyond the nasal angle 
of the eye, by a fold of skin detected only when the eye is 
closed. 
Going from superficial to deep parts, the eyelids are made of: 
1°—the external skin; 2°—a sphincter muscle; 3°—a fibrous 
frame, carrying on its free border; 4°—a cartilage containing 
peculiar glands; 5°—a layer of loose and abundant connective 
tissue; 6°—the tendinous expansion of the elevator of the upper 
lid proper; 7°—the internal tegument or conjunctiva; 8°—blood 
vessels and nerves. 
1°. The skin of the eyelid is very thin, and covered with 
very short and fine hairs. Long, stiff hairs, analogous to those of 
the lips and chin, are found on them, and specially on the inferior 
one. Near the free border, principally on the inferior and inter¬ 
nal third of the upper lid and in the commissures, the hairs are 
absent and the eyelid assumes a shying dark tint in animals 
whose skin is pigmented. The skin is very adherent to the 
sphincter, and much care is required to isolate it, so thin is the 
layer of connective tissue underneath—it seems even to be absent 
