192 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxvi. 



reduced by some downward crushing of the prefontal bones. The 

 orbit seems to have had a fore-and-aft diameter of about 17.5 mm. 

 The width of the interorbital space is 11 mm. A comparison of the 

 snout of this specimen (Plate 5, i) with that of the type-specimen 

 will show that that of the latter was considerably blunter. This may 

 be due to the greater age of the type-specimen, to sex, or possibly to a 

 diiference of species. 



On the plate the numeral 8 is placed on what seems to be the outer 

 surface of the left quadratojugal; numeral 9 is on the inner surface 

 of the left jugal. The numeral 10 is on the inner surface of the right 

 jugal, partly covered by a costal plate. The left postorbital, j, pre- 

 sents its inner surface and lies against the left parietal, but not in the 

 natural relation of the two bones. The numeral 5 is on the outer 

 surface of the right parietal. The inner surface of the right post- 

 frontal, 11, is shown. Attached to its hinder end, apparently in its 

 original place, is the right quadratojugal. The numeral 7 is on the 

 inner surface of the left squamosal. The supraoccipital, 6, has its 

 hinder end directed upAvard on the plate. It did not have the gi-eat 

 height that the same bone of the type had.'* The left opisthotic, 

 joined to the corresponding prootic, presents its upper surface, 2. 

 Through the wrenching of the supraoccipital from its place, the 

 brain cavity has been exposed, and is seen just above and a little to 

 the right of the numeral 3. The pterygoids are seen in position in 

 front of the brain cavity. 



The lower jaw, 3, has been little removed from the position occu- 

 pied by the skull at the death of the animal. The upper surface of 

 the jaw is exposed to view. The lower jaw greatly resembles that of 

 the type of the species,^ including the section of the symphysis. 



The skull appears to have had a length, from snout to occipital 

 condyle, of nearly 55 mm. One of the ceratohyal bones is seen at the 

 hinder end of the left ramus of the lower jaw. 



The structure of the carapace can not be completely determined. 

 Its hinder portion is missing. The nuchal, 1<S, has the form of that 

 of T. latiremis, as figured by Case.'' It is quite different from that of 

 T. hauri Wieland.'* 



On the left side of the carapace there is a series of eight peripherals, 

 19-26, in their natural relations. It is pretty certain that the anterior 

 one, 19, is the first. The anterior five of the right side are present, 

 35, 36, 27, 28, 29. The first of the right side and that of the left are 

 separated by a distance equal to the width of the nuchal. The third 

 peripheral on each side, 21 and 27, contains a pit for the end of a 

 rib. Other perij^herals, 30, 31, 32, and 34, have been washed forward 



" Hay, Fossil Turtles of North America, tiR. 219. 

 ft Idem, fig. 214. 



'• Univ. Geol. Surv. Kansas. IV, pi. S2, fig. 3. 

 (I Fossil Turtles of North America, fig. 229. 



