279 FOSSIL TURTLES OF NORTH AMERICA. 
been a sutural edge for articulation with another bone. The border between the supposed 
gular scutes is broken off. If the bone is an epiplastron it must once have projected con- 
siderably at this point, and the front of the anterior lobe was deeply emarginated. The length 
of the bone is about 40 mm.; its thickness behind is 1r mm. In case the bone is an epiplastron, 
the lip was about 40 mm. wide. The free border of the bone, that represented by the right 
side of the figure, is thick and obtuse. That of the same bone in Cope’s type of N. gravis, as 
originally described, was acute. In his last description of these bones this difference appears 
to have been thought of no specific importance. On the supposed under side of the bone are 
seen distinct sulci, indicating the supposed intergulars and the small triangular gulars. If 
such they are, affinity with the Dermatemydidz 1s indicated. Whether or not the “intergular 
was divided at the midline we can not determine. 
Fig. 3 335 represents the third left peripheral (No. 4129, U.S. N.M.) seen from above, 
while fig. “336 presents a view of the sutural end which joins the second peripheral. It is seen 
that the free border is obtuse. The costo-marginal 
sulci ran along not far below the upper margin of the 
bone. The bone is 39 mm. high, 36 mm. along the 
free border, and 18 mm. thick. Cope figures 2 periph- 
erals, but the free borders were missing in both. 
Cope’s fig. 15 is said to represent the posterior 
edge of the eighth peripheral of the right side; but it 
belonged to the left side. This bone was somewhat 
336. recurved; its height is about 44 mm.; its length on 
the free border 35 mm.; its thickness about 9 mm. at 
the border represented. The articular border for 
union with the costals was thin. 
The seventh peripheral (Cope’s fig. 16) is stated 
to have been 42 mm. wide, 45 mm. high, and 15 mm. 
thick. This peripheral, the seventh of the left side, 
entered into the inguinal notch. Its free border was acute; its upper articular border was thin. 
Besides these peripherals, Cope had others belonging to the bridge region. These he states 
had very obtuse free borders. The general massiveness of these was in contrast with the thin- 
ness of the costals. The surface of the peripherals is said to have been obsoletely rugose. 
A vertebral bone is stated to have been 7 mm. thick. 
FIGs. 335 AND 336.—Notomor pha gravis. 
View of third left peripheral of the 
type, with section. x8. 
335- Peripheral seen frorn without. 
336. Section at anterior end. 
Genus BAPTEMYS Leidy. 
Plastron united with the carapace by means of sutures and by axillary and inguinal 
buttresses, which rise to the lower borders of the costals or beyond. Plastral lobes short and 
narrow, the hinder not notcht. Nuchal bone with short costiform processes. A full set of 
neurals. Marginal scutes not encroaching on the costal bones. Intergulars, gulars, and 
humerals of each side usually consolidated into one scute. Inframarginals present. 
Type: Baptemys wyomingensis Leidy. 
This is the only genus of the Dermatemydide which possesses a full series of neurals. 
The pectoral scutes appear to have extended themselves forward to the epiplastrals and even 
further. The region which in Adocus is occupied by the intergulars, gulars, and humerals of 
each side presents usually only a single scute; but in a specimen of B. tricarinata (fig. 348) the 
gulo-humeral sulcus is partly dev elopt. 
This genus is represented by 3 known species. Of these, one, B. fluviatilis, comes from 
uncertain locality and level. Of the others, B. tricarmata belongs to the Wind River beds, 
while B. wyomingensis is common in the Bridger beds of southwestern Wyoming. 
Baptemys wyomingensis Leidy. 
Plate 37, figs. 11-13; plate 38, fig. 10; plate 40, fig. 1; plate 41, figs. 1, 2; text-figs. 337-345. 
Baptemys wyomingensis, Letny, Proc. Acad. Nat. Sci. Phila. 1870, p. 5; Ann. Report U. S. Geol. Surv. 
Wyoming, etc., 1870 (1871), p. 3673 ee Report U. S. Geol. Surv. Montana, etc., 1872, p. 367; 
Contrib. Ext. Fauna West Terrs., 1873, pp. 157, 340, plate xii, plate xv, fig. 6—Cope, Ext. 
