plastra

Plural of plastrum. plastral (plas'tral), a. [ plastron plastron (plas'tron), n. [ folds from the throat to the waist and caught in the belt: as, a plastron of lace, crape, or silk. (d) An ornamental and often jeweled decorative plaque worn on the breast C C. hy hij hp xp hip xp Plastron of Tortoise ( Emys ), ventral sur by Hindu women. (e) A man's shirt-bosom, especially one of the form fashionable for evening-dre 1875-90, without plaits, presenting a smooth surface of lawn. 2. In herpet.: (a) The ventral part of the shell of a chelonian or testudinate; the lower shell, or under side of the shell, of a turtle or tortoise: more or le opposed to carapace. The plastron is wholly an exoskeletal or integumentary structure, in which no bones belonging to the endoskeleton or skeleton proper are found. It consists of a number, typically nine, of separate dermal bones, developed in membrane, and covered with horny epidermis, or tortoise-shell. The nine typical pieces are one median and four pairs lateral, called entoplastron, epiplastron, hyoplastron, hypoplas tron, and xiphiplastron. Formerly, when these were supposed to contain or represent sternal elements, they were respectively name den to sternum, episternum, hyosternum, hyposter num, and xiphisternum. The plastron is usually immovable, like the carapace, but may be variously hinged, in some cases so as to shut the animal in completely. See also cuts under carapace, Pleurospondylia, and Chelonia. (b) One of the similar exoskeletal plates developed upon the under side of the body of certain Amphibia, as the Labyrinthodont a.-3. In mammal., the ventral shield or cuira of the glyptodons or fo il armadillos.-4. In an at., the sternum with the costal cartilages attached, as removed in autopsies.-5. In ornith., a colored area on the breast or belly of a bird, like or likened to a shield. Coues. face (outside), showing twelve horny epidermal scales as indicated by the dark lines, one of which traverses each xiphisternal ( xp ) and inter each hypo sternal (hp) clavicular scute, or en IMG:content-0361.jpg:[blocks in formation] The work ["Emblematic Mounds"] is illustrated by two hundred and seventy woodcuts, many of them full pages. They represent the effigies both singly and in groups, just as they were when measured and platted . Amer. Antiquarian, XII., adv. The town was platted in 1872, and named in honor of Prince Otto von Bismarck. Harper's Mag., LXXVIII. 360. Platan is tidæ having transversely laminate molars and the fur mixed with flattened spines. P. lasiurus is a small species like a dormouse, with a densely hairy tail, inhabiting mountainous parts of western India.