TURTLE, in zoology, the popular name for any species of the Chelonsidx. They may be distinguished by their long, com pressed • fin-shaped, non-retractile feet, with the toes inclosed in a common skin, from which only one or two claws pro ject. The carapace is broad and much depressed so that when these animals are or shore, and are turned over on their backs, they cannot regain the nat ural position. Large interspaces be tween the extremities of the ribs, and retracted within the shell; it is covered above with symmetrical horny shields, and the jaws are armed with sharp, horny sheaths. Turtles are marine animals; their pinnate feet and light shell render them excellent swimmers. They sometimes live at a great distance from land, to which they periodically re turn to deposit their soft-shelled eggs (from 100 to 250 in number) in the sand. They are found in all the inter-tropical seas, and sometimes travel into the tern portions of the sternum always remain cartilaginous, so that the carapace is far lighter than in the tortoises. The head is large and globose, and cannot be Aerate zones. The flesh and eggs of all the species are edible, though the Indian turtles are less valuable in this respect than those of the Atlantic. The most
highly valued of the family is the green turtle (Chelonia viridis), from which turtle soup is made. It attains a large size, sometimes from six to seven feet long, with a weight of from 700 to 800 pounds. The popular name has no ref erence to the color of the carapace, which is dark olive, passing into dingy white, but to the green fat highly prized by epicures. The edible turtle of the East Indies (C. virgata) is also highly prized; but, according to Tennent, at certain seasons they "are avoided as poisonous, and some lamentable in stances are recorded of death which was ascribed to their use." The hawk's-bill turtle (C. imbricate), which yields tor toiseshell, is also prized; but the flesh of the loggerhead turtle and of the leather back is of little value.
In printing, the segment plate in which a form is locked up in a type-revolving machine. The column-rules are wider at the top than at the bottom, to hold the type firmly, and are secured by screws. The edge of the side stick has a series of beveled projections, and is pressed against the form by a piece having simi larly beveled projections and worked by a screw.