. The anatomy of the domestic animals . Veterinary anatomy. 858 THE SENSE ORGANS AND SKIN OF THE HORSE temporal (Angulus oculi medialis, lateralis). The lateral angle is rounded when the eye is open, but the medial angle is narrowed and produced to form a 3-shaped bay or recess, termed the lacrimal lake (Lacus lacrimalis). In this there is a rounded pigmented prominence kno'n as the lacrimal caruncle (Caruncula lacrimalis); it is about the size of a small pea, and is covered Avith modified skin, connected ^vith that of the medial commissure, from which project a number of hairs provided with

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. The anatomy of the domestic animals . Veterinary anatomy. 858 THE SENSE ORGANS AND SKIN OF THE HORSE temporal (Angulus oculi medialis, lateralis). The lateral angle is rounded when the eye is open, but the medial angle is narrowed and produced to form a 3-shaped bay or recess, termed the lacrimal lake (Lacus lacrimalis). In this there is a rounded pigmented prominence kno'n as the lacrimal caruncle (Caruncula lacrimalis); it is about the size of a small pea, and is covered Avith modified skin, connected ^vith that of the medial commissure, from which project a number of hairs provided with sebaceous glands. The lids unite on either side and form the commissures, medial and lateral (Commissura palpebrarum medialis, lateralis). The anterior sur- face of the lids (Facies anterior palpe- brarum) is convex and is covered with very short hair. A considerable num- ber of tactile hairs are scattered over the lower part of the lower lid, but on the upper lid they are very scanty. The infrapalpebral depression (Sulcus infrapalpebralis) indicates somewhat indistinctly the limit of the lower lid. -The upper lid is marked by two fur- rows when raised. The posterior sur- face (Facies posterior palpebrarum) is adapted to the free surface of the eye- ball and is covered by the palpebral conjunctiva. The free border of the lid is smooth and usually black. It has a well-defined posterior margin (Limbus palpebrals posterior), along which the ducts of the tarsal glands open. The anterior margin (Limbus palpebralis anterior) bears stiff hairs termed the cilia (eyelashes). On the upper lid the cilia are long and num- erous except at its medial third, where they are very small or absent. On the lower lid the cilia are often scarcely distinguishable from the ordinary hairs; in other cases they may be clearly seen except near the lateral canthus, and are much finer and shorter than those of the upper lid. The edge of each lid is pierced near the medial angle by a minute, slit-like openi