tkstudinida:. 



383 



lip is not well differentiated, being narrow, pointed, and not projecting beyond the rim of the 

 carapace. The extremity is considerably thickened; but the borders are rather acute. The 



entoplastron has a width of 150 mm. Its 

 hinder border can not be exactly traced, but 

 the form of the bone has apparently been 

 nearly circular. 



The bridge has a width of 281 mm., being 

 therefore a little more than four-tenths of the 

 length of" the plastron. 



The hinder lobe has a length of 202 mm. 

 Its width is 309 mm. Its dimensions are there- 

 fore the same as those of the front lobe. The 

 hinder extremity was notcht, but the angles 

 on each side of the notch may not have been 

 so acute and long as shown in the restoration 

 and the figure. 



The arrangement of the scutes is not, so 

 far as can be determined, greatly different 

 from that of other Testudinida?. The gulars 

 do not encroach on the entoplastron. The 

 humero-pectoral sulcus runs straight across 

 the plastron (not touching the entoplastron) 

 until it approaches the axillary notches, when 

 it turns abruptly forward. The pectoral 

 scutes are very narrow, about 22 mm. at the 

 midline, but they widen right and left. The 

 abdominal scutes extend fore and aft a great 

 distance, about 242 mm., this length being 

 contained in the length of the plastron two 

 and a halt times. The femoral scutes have 

 an extent of 56 mm. along the midline. There were evidently inguinal scutes; but no axillary 

 scutes have been observed. The sulci between the plastral and the marginal scutes at the 

 bridges appear to have lain on the plastral bones, near the sutures between the plastral and 

 the peripheral bones. 



The figure publisht in the Proceedings of the U. S. National Museum, vol. xxn, plate iv, is 

 eight forty-fifths the size of the original, instead of one-seventh as stated on the plate. The 

 diagrammatic figure forming plate v of that publication is 19 hundredths the natural size. 



FlG. 481. Hadrianus schucherti. Plastron. 

 From type in U. S. N. M. 



X 



Genus ACHILEMYS nov. 



An imperfectly known genus of the Testudinida?. Carapace with recurved hinder periph- 

 erals. Sulcus between the fifth vertebral scute and the supracaudal crossing, as in Stylemys, 

 on the last suprapygal. Plastron with a broad, extremely short lip, which is obtuse and which 

 does not thicken backward on the upper surface as it does in other Testudinidae. 



Type: Hadrianus allabiatus Cope. 



Achilemys allabiata (Cope). 

 Figs. 482-485. 



Hadrianus allabiatus, Cope, Proc. Amer. Philos. Soc, xn, 1872, p. 471; 6th Ann. Report U. S. Geol. 

 Surv. Terrs. (Hayden), 1872 (1873), p. 630; Vert. Tert. Form. West, 1884, p. 140, plate xv, figs 

 13-15. Osborn, Scott, and Speir, Contrib. Mus. Geol., Archaeol. Princeton College, No. 1, [878, 

 p. 94. Hay, Bibliog. and Cat. Foss. Vert. N. A., 1903, p. 450; Amer. Geologist, xxxv, 1905, 



P- 333- 



The type of the present species belongs to the U. S. National Museum and bears the 

 number 4054. It consists of the right half of the front lobe of the plastron, 2 anterior periph- 

 erals, 3 hinder peripherals, a portion of the pygal, and a portion of the last suprapygal. It 



