. La cyclopaedia d'anatomie et physiologie. Anatomie ; physiologie ; Zoologie. 316 REPTILIA. membrane, qui est le milieu de la tunique de la paupière. C'est très délicat et doux, et parfaitement transparent dans le centre, mais de- Fig. 232.. Diagramme de la conjonctive d'un serpent. (Après Dechef.) a, eye-ball ; b, le nerf optique ; c, la paupière ; d, de la peau ; e e, f, la conjonctive. paroisses sa circonférence elle entoure certaines fibres blanchâtres opaques, supposé par Cioqnet d'être musclé. Cette couche, à la marge de l'orbite, est manifestement en continuité avec le derme : en interne, elle est bordée par la troisième couche, qui est mucou

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 316 REPTILIA. membrane, which is the middle tunic of the eyelid. This is very delicate and soft, and perfectly transparent in the centre, but to- Fig. 232.. Diagram of the Conjunctiva of a Serpent. (After Cloquet.) a, eye-ball; b, optic nerve; c, eyelid ; d, skin ; e e, f, conjunctiva. wards its circumference it encloses some opaque whitish fibres, supposed by Cioqnet to be muscular. This layer, at the margin of the orbit, is manifestly continuous with the dermis: internally it is lined by the third layer, which is mucous, being in fact the membrana con- junctiva, which is reflected on to it from the surface of the eye-ball. All around the circumference of the eyelid there is a whitish, granular, transparent sub- stance, the nature of which is apparently glandular. The lachrymal apparatus in serpents consists of a lachrymal gland ; of a mucous sac formed by the conjunctiva, into which the secretion of the lachrymal gland is poured ; of an excretory duct, or lachrymal canal ; and moreover of a large and tortuous cavity, which receives the tears and transmits them into the mouth. The lachrymal gland is proportionally of very great size, and is situated behind the eye and the post-orbital ligament. By its an- terior surface, which is concave, it adheres to the conjunctiva by means of its numerous small excretory ducts. This gland is enclosed in a very delicate cellular capsule. It is made up of rounded whitish granules united together by numerous vessels and nerves. The conjunctiva lines not only the internal surface of the eyelid, but also a large portion of the cavity of the orbit, from which it is re- flected on to the front of the eye-ball, thus forming a complete sac without any opening externally (jig. 232, f). On the anterior part of the floor of this sac there is a single pore, large enough to admit a hog's bristle. This is the punctum lachrymalc, which is single like the eyelid, behind

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