10 EMYSOREGONIENSIS. 



quadrilateral, and serrated anteriorly, but they are broadest in front. All these 

 plates are marked with three concentric hnes posteriorly, and are longer than in 

 any other species of Emys that has fallen under my observation. The fourth, 

 fifth, sixth and seventh plates are quadrilateral, smaller, and revolute to form a 

 small groove. The remaining plates are also quadrilateral, broader, but not 

 revolute. 



The sternum is broad, slightly contracted in the middle, serrated in front, and 

 emarginate behind. The gular plates are triangular in shape, vrith their bases 

 directed forwards, and serrated; at their outer angles is a process, prominent, 

 pointed, and projecting beyond the rest of the plate: between these two protuber- 

 ances is a concavity for the neck. The brachial plr.tes are triangular, their bases 

 round, their apices truncated and directed inwards; the thoracic are narrow, 

 quadrilateral, with their posterior and external angles elongated; the abdominal 

 are pentagonal, and very broad; the femoral are irregularly quadrilateral, and 

 broadest externally; the subcaudal are rhomboidal. Of the supplementary plates, 

 the axillary are triangular, with their apices turned backwards; the inguinal are 

 larger and quadrilateral, with an anterior angle prolonged. 



The head is moderately large and elongated; the snout pointed. The upper 

 jaw is furnished in front with two remarkable teeth, and the lower has a well 

 developed hook. 



The anterior extremities are rather long, flattened, and covered with large 

 transverse rows of scales; the fingers are five, palmated, and furnished with five 

 strong nails. The posterior extremities are round at the thigh, but greatly flat- 

 tened at the tarsus; the toes are five in number, and fully palmated, but only four 

 are furnished with nails. The tail is lonor. 



Colour. The shell is dusky brown; the vertebral and lateral plates are marked 

 by pale yellow lines; these communicate with each other, and give a reticulated 

 appearance to the carapace; the marginal plates have each a similar vertical line 



