DERMATEMYDID&. 267 
From H. crassa the present species differs in having the supposed seventh peripheral 
strongly sutured to the contiguous costal bone, in having no lateral carina, and in having the 
= r longitudinal sulcus at the middle of the 
| height, instead of near the costal border. 
| : In the inner face of the bone are excava- 
\ tions for the reception of digitations from the 
p - plastron. One of these digitations remains in 
( position, and shows that it extended backward 
\ ye ashort distance intothe eighth peripheral. The 
border which articulated with the costals is 7 
mm.thick. In the sutural edge is a deep pit, 10 
mm.in diameter, which received the extremity 
of the rib of the contiguous costal plate. 
a, bone seen from side; , anterior end; ¢, posterior end} d, an Fig. 328 shows the type peripheral as 
adhering fragment of the plastron. ae 5 pas 5 
: seen from the outside. The drawing on the 
right presents a view of the hinder end of the bone; the one on the left, the anterior end. 
7 
a 
Fic. 328.—Hoplochelys paludosa. Supposed left 
seventh peripheral forming type. *3. A.M.N.H. 
Genus KALLISTIRA nov. 
Carapace thick and solid; provided with a median and two lateral carina. Plastron 
unknown, except that its inguinal buttresses were extensively developt and ascended a con- 
siderable distance against the inner surface of the fifth and sixth costals. 
Type: Dermatemys costilatus Cope. 
Kallistira costilata (Cope). 
Pigs. 329-334. 
Dermatemys? costilatus, Cope, Syst. Catalogue Vert. Eocene, N. Mex., 1875, p. 36. 
Dermatemys costilatus, Cop, Report on Geol. N. Mex., 1874 (1875), p. 96; Wheeler’s Surv. 100 Merid. 
IV, pt. il, p. 52, plate xxiv, figs. 17-31. 
Baptemys costilatus, Hay, Bibliog. and Cat. Foss. Vert. N. A., 1902, p. 445. 
> 
The types of the present species belong to the U.S. National Museum and bear the number 
1152. Not all the fragments that Cope fgured are present. Those missing are the originals 
of Cope’s figs. 17, 20, 23, 24, 26, and 31. Cope states that he had fragments representing 6 
individuals, and that parts of 4 were figured. There appears to be no reason for doubting 
that all of these individuals belonged to the same species. Figures of some portions of these 
types are here presented. ‘he species was found in the Wasatch beds of New Mexico. 
The species is characterized by its thick and heavy shell and the presence of at least 3 
carine on the carapace, one running along the midline and one on each side of it. 
The fragment which furnisht Professor Cope’s figs. 27 and 28 belongs to the upper end of 
a costal, probably either the second or the fourth. Cope’s fig. 27 (fig. 329) is inverted on 
his plate. The width of the costal is 20 mm. It is crost by a low keel whose breadth is almost 
g mm., but whose elevation is scarcely a millimeter; the thickness of the costal above the carina 
being 6 mm., that thru the carina, 7 mm. At the distal end of the fragment the thickness 
is 5 mm. This piece of costal presents a part of the sulcus bounding a vertebral scute laterally 
and the sulcus running down the costal. These are extremely narrow and shallow. The 
longitudinal sulcus is at a maximum distance of 10 mm. from the proximal border of the costal 
and above the lateral carina. The vertebral scutes appear to have had a width of about 
42 mm. The proximal end of the costal 1s rounded, showing that the lateral borders of the 
adjacent neural were concave. Another costal, the one furnishing Cope’s figs. 1g and Iga, 
belonged to a smaller individual. The carina is still less conspicuous than in the case of the 
one just described. The original of Cope’s fig. 21 (fig. 330) has the carina more sharply 
defined and with a width of 5 mm. It is probable that, as suspected by Cope, the carine 
were developt on the rear of the animal and disappeared anteriorly. 
Fig. 331 represents the original from which Cope obtained his fig. 30. It is a portion of the 
distal half of a costal, in all probability the fifth of the right side. The extreme end of the bone 
