534 FOSSIL TURTLES OF NORTH AMKRICA. 



Amyda? buiei (Cope). 

 Plate 98, fig. 12. 



Trionyx buiei, Cope, Trans. Amer. Pliilos. Soc, xiv, 1869, pp. 151, [53; Kerr's Report Geol. N. Caro- 

 lina, 1, Append. B, 1875, p. 54. Hay, Bibliog. and Cat. Foss. Vert. N. A., 1902, p. 453. 



In the original description of this species Professor Cope stated that it was represented by 

 numerous costal bones in a more or less fragmentary condition. Of these fragments only a 

 single one has been recognized in the Cope Collection in the American Museum of Natural 

 History. A figure of this is presented on plate 98. The fragment belongs to the distal end 

 of a costal plate, and extends from one sutural margin to about the middle of the width of the 

 plate. The thickness is slightly less than 5 mm. at the sutural border, and about 6 mm. 

 thru the rib. The distal end of this plate was probably about 30 mm. wide. 



The sculpture consists of rather low and narrow ridges, which run in a curved course 

 across the bone. Some distance from the sutural border the ridges begin to be connected by 

 cross-ridges, so that the intervening furrows become broken up into pits of irregular sizes. 

 Two of the furrows occupy a space of about 5 mm. The furrows and pits are considerably 

 broader than the ridges themselves. It is not unlikely that the proximal ends of the costals 

 will have the pitting extended to the sutural borders. 



The little matrix which yet adheres to this bone is very green. 



From the Miocene near Mount Olive, Duplin County, North Carolina. 



Until additional materials belonging to this species are forthcoming we must remain 

 uncertain as to its generic relationships. 



Amyda? cellulosa (Copel. 



Trionyx cellulosus, Cope, Proc. Acad. Nat. Sci. Phila. 1867, p. 142. Hay, Bibliog. and Cat. Foss. 

 Vert. N. A., 1902, p. 455. Case, Maryland Geol. Surv., Miocene, 1904, p. 62. 



The unsatisfactory remains on which the present species was founded were collected, as 

 stated by Cope in the beginning of the paper cited above, in Charles County, Maryland, not 

 far from the Patuxent River, in the beds of the Yorktown epoch. These remains were never 

 figured and appear to be lost. The following is Cope's original and only description of them: 



I wo small fragments of the carapace are all that represent this species. The sculpture is, however, 



exceedingly characteristic, and different from that of any recent or fossil species known to the writer. 



The surface is marked by numerous closely placed pits, which are remarkably deep, producing the 



vesicular appearance of scoria. The resemblance is heightened by the irregular size of the pits. Edges 



of septa rounded. 1 he fragments are unusually thick, indicating a species of large size. 



Lines. 



Width of free portion of rib at origin 7.5 [15.6 mm.] 



Depth of portion of carapace 4 33 f 9 mm.] 



The deposits in which this species was found are now known as the Calvert formation of 

 the Miocene. 



In the same locality and formation Professor Cope found other fragments of a trionychid 

 which exhibited larger and more regular pits, separated by wider partitions (Proc. Phila. 

 Acad. 1867, p. 143). To these he gave no specific name and the specimens appear to be lost. 



Genus TEMNOTRIONYX nov. 



Triturating surface of maxilla with a sharp ridge running parallel with the cutting-edge 

 of the jaw. Presence of preneural and the number of the costals unknown. 

 Type: Temnotrionyx manducans Hay. 



Temnotrionyx manducans sp. nov. 

 Plate 105, figs. :. 3 ; text-fig. 690. 



In the Bridger beds, near the mouth of Cottonwood Creek, Wyoming, in 1903, the writer 

 found some fragmentary remains of a trionychid which appears to be hitherto undescribed. 

 The specimen is now in the American Museum of Natural History, New York, and has the 

 catalog number 5929. The remains consist of the left quadrate and prootic, a portion of the 

 right maxilla, the median portion of the nuchal, one neural, probably the fifth or sixth, the 



