©OXOCHELYID&A. LAL 
lower jaw is much smaller. This surface is triangular, the inner lobe seen in T. latiremis 
being greatly reduced in T. serrifer. 
The interorbital space (fg. 212) had a width of 16 mm. where narrowest. ‘The groove on 
the under surface of the frontals for the olfactory nerve is relatively narrower chan in 7. 
latiremis, in which the groove is nearly one-third as wide as the interorbital space; whereas, 
ek in T. serrifer it is only about one-sixth the width of that space. The 
Ne anterior borders of the prefrontals are broken away, so that the 
wn width of the anterior narial passage can not be determined. It is 
certain, however, that the nasal cavity itself had the lateral extent 
that it had in 7. latiremts. 
An estimate shows that the length of the skull from the snout to 
the occipital condyle was about 80 mm. 
Two adjacent peripheral bones are present, probably the left 
eighth (fg. 213) and the ninth. The eighth is 40 mm. long and 32 
mm. ae the ninth 43 mm. long and 32 mm. wide. Each is notcht 
just behind the widest portion and here the width of the eighth is 2 
mm., of the ninth 27 mm. The thickness of the inner fre is nearly 
7 mm., and at the hinder end of this face is a pit for a rib. 
The specimens which were referred to this species by Case (Univ. 
Geol. Surv. Kan., rv, p. 379) are described as 7. stenopora. From 
the latter species ie serrifer differs in having a dentary with an 
alveolar surface much wider in proportion to its “depth, and not beakt 
at the tip. 
It is evident that the skull (and probably the whole skeleton) of T. serrifer was much larger 
than that of 7. stenopora. This makes it all the more remarkable that the dentary of the 
former is relatively so short and that the depth of 7. stenopora is so great. It seems not im- 
probable that the carapace and part of the plastron described by Wieland as 7. hauri will 
prove to belong to the present species. 
Fic. 213—Toxochelys ser- 
rifer. One peripheral 
and part of another. 
Tie 
Toxochelys brachyrhina Case. 
Plate 31, fig. 1. 
Toxochelys brachyrhinus, Case, Univ. Geol. Surv. Kansas, tv, 1898, p. 378, pl. Ixxxiv, figs. 1, 2—Hay, 
Bibliog. and Cat. Foss. Vert. N. A., 1902, p. 442; Bull. Amer. Mus. Nat. Hist., xx1, 1905, p. 177. 
The type of this species is a skull, the property of Kansas University, and bearing the 
number 1212. Dr. Case’s description of it is exceedingly brief. The character which he gives 
as distinguishing it from 7. /atiremrs is the much blunter snout. Case’s fig. 1 of his plate i is 
three- faurche of the natural size; and, while the form of the skull is shown, the details are not 
well represented. His fig. 2 is a restoration of the size of nature, but it does not indicate the 
sutures; likewise it represents the anterior half of the skull as somewhat too broad. 
The skull of this species appears to be distinguisht from that of 7. /atiremis in being 
narrower posteriorly in relation to the length and in having a broader snout. Another distin- 
guishing character seems to be found in the narrower posterior region of the palate. In the 
case of a large specimen of 7. Jatrremzs, 130 mm. from the snout to the occipital condyle, the 
pterygoid portion of the palate, where narrowest, is 36 mm. wide. Inthe type of T. brachyrhina, 
117 mm. to the occipital condyle, the palate is only 20 mm. wide. The interorbital space also 
is relatively narrower than in T. latiremis. In the specimen of the latter referred to, the space 
between the orbits is 24 mm. wide, in T. brachyrhina, only 19 mm.—too great a difference to 
be due to difference of size alone. 
The following measurements are given of the type specimen: 
Millimeters. 
Length from the snout to the occipital condyle. .................005. 117 
Length to extremity of supraoccipital bone. . 134 
Distance between the outer faces of quadrates. F go 
Distance between outsides of squamosals... . ; : O+ 
Width at hinder borders of orbits.......... ; ; 80 
Width at front of orbits........ Me cin se shy ian ye Gara tA. t- L50 
