14 CONTENTS OF A BONE CAVE. 



MEASUREMENTS OF FORE LIMB. 



II. 



Diameter of glenoid face of scapula j vertical .020 



(.transverse . . . .035 



Transverse diameter of neck of scapula 035 



Length of coracoid process (horizontal) . . 015 



Elevation of spine of scapula . oiO 



Diameter of head of humerus | transverse - .033 



(fore and aft . . . . .028 



of ulna at middle J^nsverse . . , . . . 14 



(vertical .... .024 



Depth of ulna at coronoid process . . . .033 



" of olecranon .... 022 



Length "... . .032 



Width ... ... .019 



Diameter of radius at middle I vertlcal -010 



(transverse . . . . .018 



" of head of radius \ vertical - 016 



(transverse .... .028 



AMBLYRHIZA QUADBANS, Cope. 

 Loxomylus quadrans, Cope, Proceedings Amer. Philosoph. Soc 1871, 102. 



This species is represented by teeth intermediate between the A. innndnla and 

 A. lalidens in size. It was originally established on a first superior molar which 

 is worn down so far as to have lost the characteristic curvature, and to be nearly 

 straight in the shaft. Its section is nearly a quarter of a circle, a little longer 

 anteroposteriorly than transversely, not so elongate as the corresponding tooth of 

 A. inundata, but more as in A. latidens. The dentinal columns are oblique in the 

 transverse direction, the second being most extended, the third next, the first a 

 little shorter, and the fourth shortest, and transversely triangular in form. The 

 internal and posterior borders are nearly straight, and form a little more than a 

 right angle with each other. The sides of the shaft are not grooved, except a 

 shallow interruption between the first and second plates on the external aspect. 



M. 

 Length of shaft preserved ...... .023 



Diameter of grinding face | anter P sterior ' ' - 015 



(transverse .... .014 



The posterior portions of both mandibular rami of one individual support teeth 

 which differ from the corresponding ones of A. latidens, and which agree in pro- 

 portions with the tooth above described. I refer them provisionally to the same 

 species. 



The left ramus exhibits the alveoli of all the teeth. As in the other species they 

 are straight, and directed obliquely upwards and forwards, and are not oblique 

 laterally. The third and fourth are a little longer than wide, and their alveolar 

 septa are a little oblique outwards and backwards. The second alveolus is smaller 

 and relatively wider than the others. 



