. Carnegie Institution of Washington publication. . 482. 483- 485. Figs. 482-485.—Achilemys allabiatus. X 3- Type. 482. Portion of rear of carapace, per. 11, eleventh peripheral; py, pygal; spy, suprapygal. 483. Portion of anterior lobe of plastron, hyo, hyoplastron; enl, cntoplastron; epi, epiplastron. 484. Section of ninth peripheral. 485. Section at anterior end of eleventh peripheral. structure found in the other species of the genus, except possibly in H. tumidus, the only known specimen of which does not present that region. In Achilemys allabiata this lip is not differ- entiated even so
. Carnegie Institution of Washington publication. . 482. 483- 485. Figs. 482-485.—Achilemys allabiatus. X 3- Type. 482. Portion of rear of carapace, per. 11, eleventh peripheral; py, pygal; spy, suprapygal. 483. Portion of anterior lobe of plastron, hyo, hyoplastron; enl, cntoplastron; epi, epiplastron. 484. Section of ninth peripheral. 485. Section at anterior end of eleventh peripheral. structure found in the other species of the genus, except possibly in H. tumidus, the only known specimen of which does not present that region. In Achilemys allabiata this lip is not differ- entiated even so much as it is in the Emydidae. The second reason is found in the structure of the hinder region of the carapace. With the other bones of this species at Washington there is a portion of a suprapygal which joins accurately the eleventh peripheral and the pygal of the type. This is represented in its proper position in fig. 482. This bone has the position of the third suprapygal ot Tcstudo and ot Hadrianus corsoni. In the genera just named the sulcus between the last vertebral scute and the supracaudal scute follows closely the suture between the third suprapygal and the pygal. In the species being here described the sulcus crosses the suprapygal at some distance above the suture referred to. It is to be noted also that the three peripherals of this region are travelst by perpendicular sulci from top to free border, showing that the sulcus between the marginal scutes and the costal scutes ran on or above the sutures between the peripheral and costal bones. The position of the sulci of this region in our species resembles somewhat that of Kachuga, as represented by Mr. Boulenger (Cat. Chelonians, p. 53, fig. 16). The epiplastron (fig. 483) figured by Cope has the anterior end thickened and rounded in section. More posteriorly this epiplastron has an acute border. At their symphysis the epi- plastra have a thickness of 23 mm. The truncated end of the anterior lobe, the rudimenta
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