22G 



lion of (lie shell of the species which has been submitted to me. It com- 

 prises the vertebral plates from the sixth to the ninth inclusive, and portions 

 of the corresponding costal plates on each side. The narrow character of the 

 costal capitula is observable in the sixth and seventh pairs ; and the 1 wo suc- 

 ceeding pairs are observable as they spring from the strong process for the 

 attachment of the pelvis. 



Fig. '8, Plate XIX, represents the distal extremity of a right humerus, and 

 Fig. 6 the same part of a left femur, both half the natural size. The femur 

 would appear to have belonged to a larger animal than the humerus. The 

 concavity above the articular surface is much deeper than in other known 

 turtles. The breadth of the femur, at the condyloid eminences, is 32 lines; 

 that of the humerus, in a corresponding position, has been nearly the same. 



Stylemys oeegonensis. 



An isolated vetebral plate, in the Condon collection of Oregon fossils, is 

 supposed to indicate a third species of Stylemys. The specimen was found 

 on Crooked Kiver, and is represented, one-half the natural size, in Fig. 10, 

 Plate XV. It exhibits a transverse groove defining two vertebral scute areas, 

 and on the interior a narrow crest for union with the corresponding neural 

 arch. The plate appears to be the third of the series, and is thicker in pro- 

 portion with its length and breadth than would appear to be the case in the 

 preceding species of Stylemys. The specimen is 2 inches wide, 1J inches 

 long, and 7 lines thick. 



