EMYDIIX*:. 



3 6i 



for examination. This and some other bones were dredged by him in the Alifia River, Florida, 

 about a mile above its entrance into Tampa Bay. With this bone there were obtained remains 

 of some species of Trachemys and a peripheral of a very large Testudo, possibly T. crasst- 

 scutata (Leidy). The writer has been informed that these bones were accompanied by bones 

 of horses, tapirs, etc. The remains seem therefore to agree with those taken from the Peace 

 Creek beds, near Arcadia, DeSoto County, of the same state. The latter bone bed has been 

 declared to be of older Pliocene age, but the evidence appears to be contradictory. 



This new species of box-tortoise is'remarkable for its size and the great thickness of its 

 plastron. The length of the left hypoplastron (plate 56, fig. 7),"measured along the midline, is 

 73 mm., and the width is almost exactly the same. If this bone had the same ratio to the other 



460. 



FIG. 459 AND 460. -Terrapene putnami. Hypoplastron of type. X 



459. Section from articulation with opposite hypoplastron (on right) to lateral hinge (on left). 



460. Face articulating with its fellow. Anterior end of the bone at right hand. 



portions of the shell that the corresponding bone has in T. Carolina, the carapace must have 

 been 265 mm. long, and the width about 200 mm. 



At the midline of the plastron, just in front of the union of the hypoplastron with the 

 xiphiplastron (fig. 460, on the left), the former bone is 22.5 mm. thick. In a specimen of T. 

 Carolina whose hypoplastron is 38 mm. wide the thickness at the point named is 4 mm. or less. 

 In the fossil the thickness becomes reduced laterally, so that at two-fifths the distance toward 

 the lateral hinge (fig. 459) it is only 12 mm. It then increases and at the hinge is 15 mm. 

 Toward the anterior end of the bone the thickness diminishes to 12 mm. 



The hinder portion of the lateral hinge (plate 56, fig. 8) is broken away. At its anterior 

 end there is a deep and rough pit for a process proceeding from the fourth and fifth peripherals, 



462. 



Pics. 461 AND 462. Terrapene putnami?. Fragments of carapace. X 

 Specimen in Vanderbilt University. 



461. Left side of front of carapace, c. p. I, part of first costal plate; m. s. z, m. s. 3, m. 5. 4, second, third, and 



fourth marginal scutes. 



462. Rear of carapace, m. s. n, m. s. iz, eleventh and twelfth marginal scutes; per. 1 1, eleventh peripheral; py, 



pygal; spy, suprapygal. 



as in T. Carolina. The hinder border of this pit is about 22 mm. behind the anterior border of 

 the bone. Behind this comes the flat, rough, and perpendicular surface, about 14 mm. high, 

 that articulated loosely with the fifth and sixth peripherals, forming one side of the lateral 

 hinge. This surface is relatively broader and flatter than in T. Carolina and resembles more 

 that found in T. ornata. It is likewise broader and flatter than the same surface in T. mar- 

 nochi, judging from the carapace in the American Museum of Natural History so identified. 

 In that specimen the hinge surface on the carapace is only 8 mm. wide. 



The hyohypoplastral hinge hardly differs from that of T. Carolina, except in thickness, 

 which in T '. putnami is close to 12 mm. The upper half of the hinge (fig. 460) is rough for the 



