VERTEBRATE REMAINS, PORT KENNEDY BONE DEPOSIT. 195 



respect it differs from all the species known to me. In the hitter the free lateral 

 margin is expanded and sharp-edged, anterior to the femoro-anal dermal suture, the 

 suture marking an abrupt contraction of the border. In this species the contraction 

 takes place anterior to the femoro-anal scutal suture, which extends from an obtusely 

 rounded border. The thickened border is sharp-edged for only a short distance in 

 advance of its terminus, the angle soon approaching right. This is due to the 

 rapidly increased thickness of the border, by the elevation of its inner border into a 

 ridge. The border, posterior to the femoro-anal scutal suture, though thickened, is 

 flat. Posterior border not preserved. The marginal bones of the bridge are robust, 

 and their superior face is slightly concave. The dermal suture present is about as 

 in C. insculpta. 



The second lot includes a piece of the inguinal marginal, which shows that this 

 species has the fixed anterior lobe of the plastron of the Emydidae. The superior 

 face is flat. On the inferior face the bridge is strongly convex in the transverse 

 direction, and the convexity is cut off' from the flat free inferior face of the marginal 

 by a strong oblique groove from the axilla outward and backward. This groove 

 is present, but faint, in C. insculpta. Posterior to the groove the inferior surface of 

 the marginal is nearly flat in the latter. The free marginals associated with this 

 piece are from posterior to the bridge. Although of large size their costal border is 

 not sutural, but is smooth, showing that the animal had not attained its full growth. 

 The gomphosis is well developed. The inferior surface is gently concave trans- 

 versely, but the edge is not serrate nor recurved. 



It is not proven that this species does not belong to the genus Tesludo. The 

 bones preserved, however, accord entirely with those of the semi-terrestrial forms of 

 Emydida? distinguished under the name of Clemmys Wagl. (Ckelopus Raf., Rhino- 

 clemmys Gray). 



Measurements, No 1. 



mm. 



Thickness of hyoplastral suture of post-abdominal bone near free border; 18 



" " " " " near median border; 9 



Width of thickened border of post-abdominal bone at femoro-anal suture ; 10 



No. 2. 

 Diameters of a posterior free marginal : 



External border, length ; 28 



Anterior border, length ; 42 



Greatest thickness ; 11 



No. 3. 



Greatest thickness of a free marginal ; 25 



Greatest thickness of a plastron at middle ; 18 



The surface of the bones is nearly smooth, the only exception being some very 

 faint grooves on the free marginals (No. 2) parallel to the long axis of the carapace. 



