. Bulletin of the Natural History Museum Zoology. A NEW SNAKE FROM ST LUCIA foramen for the maxillary nerve which emerges on the underside anteriorly. For sample specimens the skin on the side of the neck was turned forwards to expose the superficial jaw muscles and ligaments and the labial glands. The most superficial muscle, which is easily damaged, is the constrictor colli (Haas, 1973). In the outgroup this is a thin sheet of muscle which passes from about the level of the head of the quadrate backwards and downwards over the jaw articulation to insert on the skin of the throat. In the spec

- Image ID: RGCRKR
. Bulletin of the Natural History Museum Zoology. A NEW SNAKE FROM ST LUCIA foramen for the maxillary nerve which emerges on the underside anteriorly. For sample specimens the skin on the side of the neck was turned forwards to expose the superficial jaw muscles and ligaments and the labial glands. The most superficial muscle, which is easily damaged, is the constrictor colli (Haas, 1973). In the outgroup this is a thin sheet of muscle which passes from about the level of the head of the quadrate backwards and downwards over the jaw articulation to insert on the skin of the throat. In the spec
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Image ID: RGCRKR
. Bulletin of the Natural History Museum Zoology. A NEW SNAKE FROM ST LUCIA foramen for the maxillary nerve which emerges on the underside anteriorly. For sample specimens the skin on the side of the neck was turned forwards to expose the superficial jaw muscles and ligaments and the labial glands. The most superficial muscle, which is easily damaged, is the constrictor colli (Haas, 1973). In the outgroup this is a thin sheet of muscle which passes from about the level of the head of the quadrate backwards and downwards over the jaw articulation to insert on the skin of the throat. In the species of Clelia examined the muscle follows a similar course, the anterior portion has a diffuse origin on the surface of the adductor externus profundus muscle. The posterior portion arises on the head of the quadrate; this is inferred derived (Fig. 4). The cervico-mandibularis muscle arises from the back of the neck and passes downwards and forwards to insert on the articular head of the quadrate (Fig. 4). This appears to be a primitive condition. From the articular head of the quadrate arises a ligament which passes forwards and divides. The lateral, labial portion inserts on the posterior supralabial scales and onto the capsule of Duvernoy's gland. It peels off the supralabial scales rather more easily than is usual in snakes; this is thought to be derived. The mesial, maxillary ligament passes forwards to insert on the posterior lateral corner of the maxilla. undifferentiated vertebral scale row, no left lung and a short trachea extending no more than five ventral scale units beyond the tip of the ventricle. Distinguished from rustica and bicolor by absence of a left lung. Distinguished from clelia, equatoriana and scytalina by the undifferentiated verte- bral scale-row and short trachea. Further distinguished from clelia by 17 scale-rows from neck to vent. Holotype: BMNH 89.8.14.25, male, St Lucia, West Indies, collected by G.A. Ramage, presented by West Indies Explo- ratio

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