TESTUDINIDA:. 



449 



about 75 mm. The limbs and the region about the tail present the armor that has been already 

 described. Another shell collected by Mr. Sternberg and now in the American Museum has 

 a total length of 800 mm. 



Among the materials collected by Mr. C. H. Sternberg and his party, in 1877, in the Loup 

 Fork beds of Decatur County, Kansas, are some portions of a large tortoise which appears to 

 be specifically different from T. orthopygia. The portions represented by determinable bones 

 are the greater portion of the shoulder-girdle, the right half ot the pelvis, and the femur. The 

 number of the specimen is 2416 of the American Museum of Natural History. 



The length of the coracoid, from the suture in the glenoid fossa to the inner hinder angle, 

 is 135 mm., the breadth of the inner border, no mm., and the breadth across the neck of the 

 bone 37 mm. The procoracoid process is a stout bone, without distinctive characters. Only 

 a portion of the scapula remains. 



The width of the pelvis (fig. 607), from the pubic border of one acetabulum to that of the 

 other, was 226 mm.; the length along the midline, from the hinder border of the ischia to the 

 notch in the pubes, 135 mm. The least width of the ischium mesiad of the ischial tuberosity 

 is 43 mm.; laterad of the tuberosity, 28 mm. The least width of the pubis mesiad of the 

 lateral process is 32 mm.; posterior to the lateral process, 38 mm. The symphysis of the 

 ischia is very thick, 22 mm.; that of the symphysis of the pubes, only 10 mm. The chief 

 feature which distinguishes the pelvis from that of T . orthopygia is found in the lateral process 

 of the pubis. In T. orthopygia this is relatively short, but broad and comprest, with the upper 

 surface convex, the lower concave, the distal end broadly rounded, and the horizontal diameter 

 nearly twice the perpendicular. In the pelvis here described the process is nearly twice as 

 long as in T. orthopygia, tapering, convex above, with a prominent ridge below, and the 

 horizontal diameter less than the perpendicular. 



The right femur (fig. 608) is nearly complete, the head only being somewhat damaged. It 

 is a somewhat slenderer element than the corresponding bone of T. orthopygia. The table pre- 

 sents the measurements of this bone 

 compared with those of the femur 

 of T. orthopygia, No. 1325, American 

 Museum Natural History. 



While the articular head of the 

 femur of the form here described is 

 damaged so that its exact dimensions 

 can not be determined, it appears not 

 to have been so large as that of the 

 species with which it is here compared. On the other hand, the digital fossa is much larger 

 than in T. orthopygia, having nearly twice the diameter. It is to be observed that the diameter 

 thru the distal tuberosities of the present form is greater than in the specimen of T . orthopygia. 

 The type of the latter species has the distal end of the femur 63 mm. wide. 



It is, of course, possible that the materials here described belong to some already named 

 species of Testudo, but this can be determined only by future research. 



Testudo gilberti Hay. 

 Plate 80, figs. 2-5. 



Xerobates? undata, GILBERT, Kansas Univ. Quart., vn, ser. A, 1898, p. 143, figs. 1-4. 

 Testudo gilbertii, HAY, Amer. Geologist, xxiv, 1899, p. 349; Bibliog. and Cat. Foss. Vert. N. A., 

 1902, p. 451. 



The only part of this animal yet known is the skull, including the lower jaw. This was 

 found in the Loup Fork deposits of Phillips County, Kansas, and was described by Mr. J. Z. 

 Gilbert, who referred it with some doubt to Cope's New Mexican species, Xerobates undata. 

 The latter was based wholly on portions of the carapace, and there is no evidence that the skull 

 belongs to the same species, except that the two occur in the same formation. The skull has 

 suffered some injuries. The squamosal and a part of the quadrate on the left side are gone, 

 thus exposing the tympanic cavity. The pedicels of both quadrates are broken away, as well as 

 the occipital condyle. 

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