Species of North American Tortoises. 105 



5. Testudo serrata. 



Testa gibba, subrotunda, carinata, longitudinaliter rugosa, 

 fusco-nigra, lineis irregularibus subradiatis flavis ; scutellum 

 intermedium marginale angustum, lineare, subsemicylindricum, 

 porrectum, genae macula magna flava ; scutella marginalia pos- 

 teriora serrata. 



Emys serrata, Merrem. Yellow-bellied Tarapin, vulg. 



Shell gibbous, oval, almost round, scarcely wider behind 

 than before, emarginate behind, carinate, longitudinally rugous, 

 brownish-dusky marked with irregular lines of yellowish, those 

 on the lateral plates subradiating. First vertebral plate urceolate, 

 much wider behind than before, the second, third and fourth 

 six-sided, the fifth seven-sided, resembling a triangle with its 

 apex truncate, and its base cut into four sides ; lateral plates 

 (except the last, which is small and square) large, subrhom- 

 boidal, with their superior side a little angled ; intermediate 

 marginal plate, narrow, linear, subsemicylindrical, subacumi- 

 nate and projecting ; the rest either square or oblong, the first 

 and second projecting beyond the others, and generally two- 

 toothed, the first very deeply, the second slightly, the five pos- 

 terior plates on each side two-toothed, so that the shell is 

 deeply serrate behind, two marginal plates over the tail rather 

 bent down. Sternum emarginate behind, and with the mar- 

 ginal plates beneath yellow ; the scapular, and bracliial, and 

 generally all the marginal plates with each a large, round, or 

 oblong black spot ; scapular plates triangular, extending be- 

 yond the others, with a small projection at the outer angle of 

 each directed forwards ; brachial plates triangular, with the 

 apices truncate, the rest quadrangular ; the femoral projecting 

 at the exterior and posterior angle beyond the caudal. Skin 



