TOXOCHELYIDE. 175 
quadrate. On the right side the whole of the quadratojugal is missing, but on the left most of 
it 1s present, but crusht. The interorbital space is 22 mm. wide. The orbit has an antero- 
posterior length of 38 mm. The nasal opening is 15 mm. wide, 
The pterygoid portion of the palate (fig. 222), where narrowest, is 20 mm. wide, being 
narrower than in 7. latiremis. The distance between the ends of the pterygoid processes is 
46 mm.; whereas, in 7. latiremis of the same size, the distance is 53 mm. The postpalatine 
foramina have a diameter of 5 mm.; those of 7. Jatiremis, a diameter of 13 mm. 
Fics. 221 AND 222.—Toxochelys elkader. Skull of type. x4. 
221. Upper view. 222. Lower view. 
The choanz are slightly further from the snout than in 7. /atrremzs, the anterior boundary 
being 28 mm. away. This region is constructed much as in 7. procax, but the choanz are 
relatively nearer the snout. The triturating surface of the upper jaw is 21 mm. wide, including 
a roughened ridge 5 mm. wide on the palatine. 
halower | jaw (fig. 223) is apparently somewhat crusht downward. It is complete, mere 
that both articulars appear to be missing. The triturating surface looks directly upward, i 
slightly concave transversely, and its inner border ov erhangs the inner face of the bone. The 
surface is 15 mm. wide at ‘the middle of the length, widening 
forward, becoming narrower backward. The symphysis has 
a width of 23 mm., both above and below. 
So far as is to be seen, the plastral bones do not differ 
from those of 7. serrifer. One coracoid is observed. The 
length is 85 mm.; the width of the free end, 48 mm. The bone 
is therefore both shorter land wider 'than that of TZ. latiremrs. 
Some of the ways in which ‘this species differs from 
T. latiremis have been mentioned; but the lower jaws are 
especially different. In 7. /atiremis the grinding-surface is 
narrower and it slopes downward and inward toward the inner 
face. 
T. serrifer differs in having the grinding-surface more con- 
eee ceodhalys elkades “O° from front to back, of equal width from end to end, and 
Lower jaw of type, with section the superior line of the symphysis equal to the width of the 
at symphysis. X¢. grinding-surface, and to the lower line of the symphysis. 
: In 7. stenopora the triturating surface of the lower jaw 
slopes downward and inward to meet the inner face of the jaw. The upper line of the sym- 
physis slopes downward and backward and is somewhat shorter than the lower line. “he 
nasal opening is contracted. The length of the prefrontal suture is equal only to one-half 
