KMYDIDiK. 295 



the summit is 18 mm. above the lower face of the hone. Backward, the wall descends, so that 

 at the femora-anal sulcus it is only 10 mm. high and its outer face is not so steep. The length of 

 the hypoxiphiplastral suture is 51 mm. The femoro-anal sulcus reaches the tree border of the 

 bone at a distance of 30 mm. behind the anterior border. 



The originals of Cope's figs, if, if, and i^ are portions of the central region of the plastron. 

 They are about 5 mm. or 6 mm. thick. 



Cope's fig. 1 represents what to the present writer appears to be the right eighth peripheral. 

 It resembles greatly the corresponding bone of Testudo tabulata. The following are the 

 measurements of the bone: 



Millimeters. 



Length along the free border 28 



Length along the sutural border supposed to join the ninth peripheral 42 



Greatest thickness of this border 12 



Length along sutural border supposed to join the seventh peripheral 37 



Greatest thickness of this border 15 



Cope's statement that the greatest thickness is 11 mm. is an error. The border regarded 

 as the posterior is convex in outline. Cope thought that this was the anterior border. The 

 free border (on the left of Cope's figure) is acute. The costal border is thickened, rounded, 

 and smooth. Evidently it formed no interlocking suture with the costal bones. The sulcus 

 (faintly seen in Cope's figure) turns slightly forward at the free border of the bone. In the 

 thinner articular border there is a rough groove which received a ridge on the face of the ninth 

 peripheral. On the supposed anterior articular face is a ridge to fit into the next bone. 



Cope's fig. id represents another peripheral. The free border (on the left of Cope's figure) 

 is acute and 27 mm. long. One sutural border (the lower of the figure mentioned) is 15 mm. 

 thick and 36 mm. long. The opposite border is somewhat damaged but was evidently thinner. 

 In the thicker articular face there is a groove instead of a ridge. It is not improbable that this 

 is a second peripheral. 



The bone represented by Cope's fig. la is difficult of identification on account of its 

 damaged state of preservation. Cope speaks of it as "a piece of the inguinal marginal, which 

 shows that this species has the fixed anterior lobe of the Emydidae. " Instead of inguinal he 

 probably meant axillary. Quite certainly the bone belongs in either the axillary or the inguinal 

 region. The form and the great thickness of the border of the hinder lobe and the smooth 

 costal borders of the peripherals render it probable that this is rather a species of Testudo 

 than of Clemmys. 



Clemmys insculpta (Leconte). 



Testudo insculpta, Leconte, Lye. Ann., New York, III, 1830, p. 112. 



Clemmys insculpta, Boulenger, Cat. of Chelonians, 1889, p. 107. Cope, Jour. Acad. Nat. Sci. Phila. 

 (2), XI, 1899, p. 194. 



Professor Cope, as cited in the synonymy, reports the finding of some bones, referred to 

 this species, in the Port Kennedy Cave, Pennsylvania. The remains were very fragmentary, 

 and there is a possibility that they may belong to some related but undescribed species. 

 C. insculpta is yet a living species in the eastern United States. 



Genus ECHMATEMYS Hay. 



Shell emydoid. Neural plates mostly hexagonal, with the broad end forward. Pygal 

 bone short, the transverse sulcus crossing above it on the last suprapygal. Plastron suturally 

 articulated with both the peripherals and the costals. Axillary buttresses rising above the 

 border of the first costal and articulating with its inner surface. Inguinal buttresses ascending 

 above the peripherals and articulating with the inner surfaces of the fifth and sixth costals. 

 Usuallv a well-developt epiplastral lip. Humero-pectoral sulcus usually crossing the ento- 

 plastron. Skull not certainly known, but almost certainly emydoid in general structure and 

 with the triturating surface of the upper jaw- narrow and with no ridge, or a rudimentary one, 

 on each side. Choanaewell forward. Lower jaw with a narrow triturating surface. 



Type: Emys septaria Cope. 



