. Elementary text-book of zoology. REPTILIA. 443 are loosely united by ligament. Hence the snakes have an enormous "gape," and can "swallow" entire animals which exceed their own diameter. All Ophidia are carnivorous. The non-poisonous groups usually have two rows of long recurved teeth on the maxillae and the palatines and ptery- goids respectively. Between these rows fits the row of teeth on the mandible. In the poisonous group the maxilla is freely hinged, and bears a single large fang or grooved tooth connected with the poison-gland, a modified salivary gland. There are
. Elementary text-book of zoology. REPTILIA. 443 are loosely united by ligament. Hence the snakes have an enormous "gape," and can "swallow" entire animals which exceed their own diameter. All Ophidia are carnivorous. The non-poisonous groups usually have two rows of long recurved teeth on the maxillae and the palatines and ptery- goids respectively. Between these rows fits the row of teeth on the mandible. In the poisonous group the maxilla is freely hinged, and bears a single large fang or grooved tooth connected with the poison-gland, a modified salivary gland. There are also a few teeth on the pterygoids, palatines and mandibles. On closing its jaw, the snake's maxilla with its l'"ig- 313'—Right Shoulder Girdle of a Tortoise. /^j Precoracoid. Coracoid. fang is swung'iip into the roof of the mouth by the automatic movement of the quadrate, pterygoid, transverse bone and maxilla. The snakes may therefore be said to exhibit extreme specialisation for a unique method of locomotion, involving loss of limbs and limb-girdles, and for an equally remarkable method of feeding. Order XN.— Chelonia. The Chelonia comprise the tortoises and turtles. They have an exoskeleton of horny epidermic plates, to which is added an underlying dermal layer of bony scutes. The whole. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
Size: 1284px × 1947px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1902
