8o 



FOSSIL TURTLES OF NORTH AMERICA. 



posterior at the femoro-anal sulci, 87 mm. As stated by Cope, there are three inframarginal 

 scutes on each bridge. The present writer regards the specimens as belonging to B. riparia. 

 The sutures are obliterated. 



Baena erailiae sp. nov. 

 Plate 20, figs, i, 2; text-figs. 67, 68. 



The type of this species is a nearly complete shell, No. 1925, of the American Museum of 

 Natural History and was collected in 1894, by Mr. O. A. Peterson, in the middle Uinta of Utah. 

 Through pressure the left side has been crusht in and small portions there are missing; the 

 edges of some of the posterior right peripherals are also broken off. On one side or the other 

 all parts are present. The elements of the shell are not co-ossified, and we are therefore able 

 to determine the limits of nearly all the bones entering into its composition. 



The length of the carapace, measured in a straight line, is 368 mm. (plate 20, fig. i; text- 

 fig. 67). Its greatest width, taken at the middle of the length, is 294 mm. almost exactly 

 the size of the specimen described as B. clara and not much smaller than the specimen of B. 

 arenosa, No. 1115 of the American Museum. It may therefore be conveniently compared 

 with them. 



FIGS. 67 AND 68. Baena emiluz. Type. Xj. Shows bones and scute areas. 



67. Carapace. 



68. Plastron. 



The form is much like that of B. arenosa, being rather wide behind, 245 mm. at the hinder 

 end of the plastron. The posterior border is furnisht with 5 or 6 scallops, the cuts between 

 which are of a depth intermediate between those of B. arenosa and B. clara. The upper midline 

 is slightly channeled, except on the last vertebral, where there is a prominent carina. 



The plastron (plate 20, fig. 2; text-fig. 68) resembles in general that of the other species, 

 but the anterior and the posterior lobes are comparatively narrow. The total length is 320 mm. 

 The anterior lobe has a length of 80 mm., a width of 1 10 mm. The tip is evenly rounded, the 

 lateral border first convex, then further back concave; so that its width at the middle of its 

 length is only 8 1 mm. The posterior lobe has a length of 83 mm. and a width of 1 22 mm. at the 

 base. Its posterior border is nearly straight. The width of the bridge is 1 60 mm. The plastron 

 comes within about 40 mm. of the end of the carapace. 



This species agrees with B. clara in having only 4 costal scutes, instead of 5. The lateral 

 margins of the first vertebral are parallel until they meet the marginals. Then the edge of the 



