198 DR. EMBLETON AND MR. ATTHEY ON THE 



pairs, run obliquely backward from the margins of the pre-max- 

 illaries and maxillaries : the premaxillary pair commence at a 

 point midway between the median suture and the opening of 

 the nostrils, and are two and a half inches apart ; thence they 

 run backward and inward for a quarter of an inch, and are 

 united by a groove running across the median line ; beyond this 

 transverse communication they pass almost directly backward for 

 one inch and a half, and then abruptly cease, having been im- 

 pressed for the last half inch upon the nasal bones : the maxil- 

 lary pair, arising on the margins of the maxillary bones, a short 

 way behind the widest part of the snout, and about a quarter of 

 an inch behind the openings of the nostrils, run obliquely back- 

 ward and slightly outward on the maxillse, and are discontinued 

 on the edges of the lacrymal bones. 



The nostrils lie, therefore, between the premaxillary and the 

 maxillary mucus -groove of each side, but nearer to the latter 

 than to the former. They are openings of about half an inch 

 diameter, nearly circular, and bounded in front by the premaxil- 

 laries, behind by the maxillaries, and internally by the nasal 

 bones ; their central points are three inches apart ; and a line 

 drawn across the nasal region between these points is nearly two 

 inches behind the point of the snout. They are only about a 

 quarter of an inch removed from the margin of the jaw. 



The orbital vacuities are large, irregularly elliptical in outline, 

 and diverge slightly from each other in front; each measures 

 four inches and a half in length, and one inch and a half across 

 the broadest part. The true orbits occupied only a portion of 

 the vacuities at the posterior and inner part, as indicated by two 

 nearly opposite and slightly prominent points on each margin 

 which are best seen on the left side of the figure on Plate I. 

 To these points ligaments and membranes, defining in front the 

 proper spaces for the eyes, had been attached ; on the right side 

 the malar bone has been partially dislocated, and its inner edge 

 driven a short way into the vacuity. 



The parietal foramen, rather more than one-eighth of an inch 

 in diameter, is formed equally by the parietal bones at the union 



