. Elements of zoölogy : a textbook. Zoology. 232 VEKTEBRATA: REPTILIA OR REPTILES. The tongue of serpents is long, slender, bifid, extensi- ble, and retractile within a sheath ; the eyes are without movable lids ; trachea very long ; lung single, and extend- ing nearly the whole length of the body. Serpents cast their skins at least once a year. They lay eggs with a flexible shell; some of them, however, are ovo-viviparous ; that is, the eggs are hatched while still in the body of the parent. This is especially true of venomous snakes. The Boa-Constrictor and Anaconda of South America, the Pyt
. Elements of zoölogy : a textbook. Zoology. 232 VEKTEBRATA: REPTILIA OR REPTILES. The tongue of serpents is long, slender, bifid, extensi- ble, and retractile within a sheath ; the eyes are without movable lids ; trachea very long ; lung single, and extend- ing nearly the whole length of the body. Serpents cast their skins at least once a year. They lay eggs with a flexible shell; some of them, however, are ovo-viviparous ; that is, the eggs are hatched while still in the body of the parent. This is especially true of venomous snakes. The Boa-Constrictor and Anaconda of South America, the Pythons of Africa and the East Indies, constitute the family of Boidse, huge serpents in some cases attaining the length of thirty or forty feet, and capable of swallow- ing dogs, sheep, and deer, after having crushed them in their powerful folds. They have spur-like appendages as rudiments of hind limbs. All of our most common species, as the Striped Snakes, Water Snakes, Black Snakes, and a long list of allied genera, belong to the family of Colubridse. They have no rudiments of hind limbs. Rattlesnakes or Crotalidse and their allies are serpents whose upper jaw contains but few teeth, but is armed with sharp-pointed, movable poison-fangs. These fangs. s Head of a Rattlesnake. em, elevator muscles ; pg, poison gland ; n, nostril, beneath which Is a little cavity or pit ; pf, poison tangs; s, salivary 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 Tenney, Sanborn, 1827-1877. New York : Scribner
Size: 1943px × 1287px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthortenn, bookpublishernewyorkscribner, booksubjectzoology
