TESTUDINIDA:. 



417 



lation of the pubis with the ischium, near the midline, to the anterior tip of the pubis is 39 mm. 

 The lateral pubic processes are stout, and appear to have been directed less strongly outward 

 than in any of the species of Testudo named above. Where it forms the anterior boundary of 

 the ischio-pubic foramen, the pubic bone is beveled off above, being in this respect like that of 

 Gopherus polyphemus. 



The femur (figs. 546, 547) is strictly like that of Testudo, since the greater and the lesser 

 "trochanters are united by a high ridge. This converts the fossa which lies between the tro- 

 chanters of the Emydidae into a pit. So far as the materials at hand indicate, this pit is much 

 deeper in T ' . vaga than in Stylemys nebrascensis. The two trochanters rise to the same level, 

 not quite to that of the head of the femur. On the distal end of the bone, a sharply defined 

 ridge separates the condylar surface for the tibia from that of the fibula, a condition that the 

 writer has not observed in Testudo. In Stylemys nebrascensis this ridge is still better 

 developt. 



The scantiness of the materials from which Leidy's Testudo ntobrarensts is known makes 

 it difficult to distinguish it with certainty from the species here described. Since the two belong 

 apparently to very different levels the probability is great that they are not identical. The lip 

 of Leidy's species appears to project further beyond the general outline of the anterior lobe 

 and the length of that part of the gulo-humeral scute that lies on the upper side of the epi- 

 plastral is shorter than in T. vaga, one-fourth the width of the base of the lip instead of one- 

 third. From the younger specimens of T. osborniana it differs in the great antero-posterior 

 extent of the pectoral scutes and in the strong differentiation of the costal bones. 



Testudo inusitata Hay. 



Plate 68, figs. I, 2. 

 Testudo inusitata, HAY, Ann. Carnegie Mus., IV, 1906 (1907), p. 18, plates iii, iv. 



This name is applied to a specimen which was collected by Mr. Earl Douglass, near 

 Canyon Ferry, Broadwater County, Montana. The horizon is regarded as being that of the 

 Deep River. The specimen is a shell, the right side of which is missing. The catalog number 

 is 311. 



The shell is convex above. The outline in front and behind is rounded. The peripherals 

 flare slightly over the limbs. The pygal is missing. The length of the carapace is 265 mm.; 

 the width is 200 mm. The nuchal is 60 mm. long, 47 mm. wide in front, 65 mm. where widest. 

 The first neural seems to have been 4-sided. The second to the sixth are hexagonal. The 

 dimensions are given in the accompanying table. 



The costal plates are alternately wider and narrower proximally and narrower and wider 

 distally. Their dimensions are shown in the middle table above. 



The peripherals over the bridges are high, rising about 65 mm. above the level of the 

 plastron. The free borders of those in front and those behind the bridges are acute. 



The vertebral scutes are considerably wider than long. The lateral borders are not greatly 

 angulated. The approximate measurements are shown above in tabular form. 



The plastron has a length of 245 mm. The anterior lobe is 80 mm. wide and 135 mm. 

 wide at the base. The epiplastral lip projects 25 mm. beyond the ends of the gulo-humeral 

 27 



