No. 1747. 



DESCRIPTIONS OF VEW FOSSIL TURTLES -HAY 



317 



outer face of the xiphiplastral wall, near the hinder end of the speci- 

 men, is seen a part of the femoro-anal sulcus. 



From B. jinrcldiv, described above, (his species differs in at leasl 

 one important respect, the inner slope of the wall around the border 

 of the hinder lobe of the plasl ron; as will he sww on comparing figures 

 !) and 12. It differs from B. sinuosa in about the same way; for in 

 the latter the upper surface of the xiphiplastron slopes rapidly 

 downward toward the central portion of the lobe. The writer has 

 not at hand information regarding the same region in B. variolosa, 

 but it probably does not differ in any important respect from that of 

 B. sinuosa. 



ADOCUS VIGORATUS, new species. 



The fragmentary remains which are described under the above- 

 given name were collected September 3, 1909, by Messrs. Gardner 



Figs. 14-18.— Adocus vigoratus. xh- >'• first neural; 15, first left peripheral; 16, .section 



ACROSS FIRST LEFT PERIPHERAL, THE UPPER SURFACE TOWARD RIOIIT; 17, LEFT SEVENTH PERIPHERAL; 

 18, SECTION ACROSS FREE BORDER of BASE of HINDEB LOBE. 



and Gidley, at Ojo Alamo, San Juan County, New Mexico. The 

 bones were secured below the upper bed of conglomerate, in those 

 beds which furnished remains of dinosaurs. The specimen bears 

 the number 6554 of the catalogue of the l T . S. National Museum. 



The individual was one of considerable size, the length of the 

 carapace having been probably 500 mm. One neural (fig. 1 1) pres- 

 ent is probably the most, anterior one. It is narrowed in front, 

 notched behind, and crossed by the sulcus that passed probably 

 between the first and the second vertebral scutes. The length is 68 

 mm. along the midline; the width is 40 mm. The anterior end was 

 about 6 mm. thick; the posterior, 10 mm. Fig. 15 represents the 

 form of the first left peripheral, while fig. 16 presents a, section 

 from the free border to the border that articulated with the first 

 costal. The bone is about 53 mm. wide along t he anterior- border ami 

 67 mm. high. Its greatesl thickness is 1!) mm., and this is the same 



