Cope.] 51b [Jan. 18, 



forwards, on account of the prominence of the zygomatic arch. There 

 are two postparietal foramina, one below and behind, the other on the 

 parieto-squamosal suture. The mastoid foramen is not small. The incisive 

 foramina are large, are longer than wide, and are separated by a rather 

 wide isthmus. The palatine foramina are opposite the third premolars. 

 There is a foramen immediately below the postfrontal process. The optic 

 foramen issues posterior to the line of the posterior border of the orbit, 

 and in front of the anteroinferior angle of the alisphenoid. The 

 foramen rotundum is large and round, and is immediately below and 

 within the ridge above mentioned, and is not overhung by a transverse 

 ridge of. the same, as in the species of MeryGochcerus known to me. 

 The f. rotundum doubtless includes the f. sphenoorbitale. The f. 

 ovale is smaller and is separated by a considerable interval from the f. 

 lacerum. The latter is subtriangular in form and is rather small, since 

 the base of the otic bulla is in close sutural contact with the sphenoid 

 and basioccipital for a considerable distance. The f. jugulare is sub- 

 triangular in outline and is smaller than the f. rotundum. It is entirely 

 distinct from the f. condyloideum, which is the size of the f. ovale. No 

 f. supraglenoideum. In comparing these foramina with those of the 

 E. jacksoni, a general resemblance is to be seen. The frontal fora- 

 mina in that species are generally closer together than in E. trigonocepha- 

 lies, and the palatine foramen is generally opposite the fourth premolar in- 

 stead of the third. The foramen magnum is slightly notched on its 

 superior border in both. 



The posterior outline of the nasal bones is truncate ; it is more or less 

 acuminate in all the specimens of E. jacksoni and E. major accessible to 

 me. The prolongation of the frontal on either side of the nasals is also 

 short and truncate in this species, and narrow and acuminate in the E. 

 jacksoni and E. major. The lachrymal is deeper than long : in the species 

 last named it is of variable size and form, but is usually as long as deep. 

 There is no distinct ridge along the parieto-squamosal suture. The ali- 

 sphenoid has a considerable contact with the parietal. The palatomaxil- 

 lary suture is irregularly convex backwards on each side of the median 

 line. It crosses the palate as in the E. jacksoni, at the front of the second 

 maxillary tooth. 



The teeth are much worn, and the first and last true molars with several 

 of the premolars have been lost, indicating the age of the animal. The 

 incisors are small and have round roots. The canines are large and of 

 the usual form. The space between them and the first premolar is short. 

 The fourth premolar is small. The second true molar is wider than long, 

 and has no internal cingulum except between the lobes, and has a trace of 

 anterior cingulum. 



Measurements. M. 



Axial length from occipital condyles to premaxillary 



border . . .' 187 



Axial length from occipital condyles to postglenoid pro- 

 cess 031 



_ 



