62 



FOSSIL TURTLES OF NORTH AMERICA. 



The anterior lobe of the present species is narrower and more pointed than that described 

 by Lambe (Com. Canad. Palaeont., ill, 1902, p. 44, figs. 10, a, b) under the name B. antiqua. 



Baena antiqua Lambe. 



Text-figs. 37, 38. 



Baena antiqua, Lambe, Contrib. Canad. Palaeont., Ill, 1902, p. 44, figs. 10, a, b. 



The materials on which this species was based belong to the Canadian Geological Survey. 

 They were collected in 1901, in the Judith Riverbeds, on Red Deer River, British America, by 



Mr. L.M. Lambe, of the Canadian Survey. The type of the species 

 consists of the median region of the anterior two-thirds of the cara- 

 pace. Near it was found the greater part of the anterior lobe of 

 the plastron, and this is believed to belong to the same individual. 

 The front of the carapace (fig. 37) was apparently broad 

 and rounded. The nuchal bone is 28 mm. fore and aft; 58 

 mm. from side to side. The neurals are irregular in form and 

 outlines. The vertebral scutes are broader than long. The 

 dimensions of the three present are given in the accompanying table. 



No supernumerary costal appears on each side of the first vertebral, such as is found in 

 many species of the genus. 



The fragment of plastron (fig. 38) presents an entoplastron that differs from all others at 

 present known in being lozenge-shaped and broader than long. Its length is 22 mm.; its 

 breadth, 28 mm. 



Fig. 37. Baena antiqua. Carapace. Type. Xi- Reduced from Lambe's original drawing, c. p. i, etc., costal 



bones; n. I, etc., neural bones; nu. p. nuchal bone. 

 Fig. 38. Baena antiqua. Anterior lobe of plastron. Xfc- From drawing by Lambe. 

 Fig. 39. Baena marshi. Plastron of type. Xfo- 



Baena marshi Hay. 



Plate 8, fig. 2; test-fig. 39. 



Baena marshi, Hay, Amer. Jour. Sci., xvm, 1904, p. 261, plate xi, text-fig. I. 



The type and only known specimen of this species comes from the Laramie deposits of 

 Wyoming. It was collected in 1889, by Professor J. B. Hatcher, in Converse County, between 

 Buck and Lance Creeks, and is now in the Yale University Museum. 



The specimen is considerably damaged. There are present the cast of the greater portion 

 of the interior of the shell, the greater part of the central portion of the carapace and most of the 



