40 Messrs. Embleton and Attliey on the 



only penetrating its outer table ; when three of these exist in 

 the same pit they are placed in a straight line : their use is 

 enigmatical ; perha^js they lodged minute glands for lubrica- 

 tion of the skin of the head. The skin we infer to have been 

 naked. 



The mucous grooves on the bones, of which there are two 

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

 niaxillaries and niaxillaries : the prcmaxillavy pair commence 

 at a point midway between the median suture and the opening 

 of the nostrils, and are 2i inches apart ; thence they run back- 

 ward and inward for a quarter of an inch, and are united by 

 a groove running across the median line ; beyond this trans- 

 verse communication they pass almost directly backward for 

 1^ inch, and then abruptly cease, having been impressed for 

 the last half inch upon the nasal bones : the maxillary 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 maxillffi, and are discon- 

 tinued on the edges of the lachrymal bones. 



The nostrils lie, therefore, between the premaxillary and 

 the maxillary mucous groove of each side, but nearer to the 

 latter than to the former. They are openings of about | inch 

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

 maxillaries, behind by the maxillaries, and internally by the 

 nasal bones ; their central points are 3 inches apart ; and a line 

 drawn across the nasal region between these points is nearly 

 2 inches behind the mid point of the snout. They are only 

 about a quarter of an inch removed from the margin of the 

 jaw. 



The orhital vacuities are large, irregularly elliptical in out- 

 line, and diverge slightly from each other in front ; each 

 measures 4| inches in length, and 1| inch 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 PL IV. ; 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. 



llie parietal foramen^ rather over ^ inch in diameter, is 

 formed equally by the parietal bones at the union of the pos- 

 terior third with the anterior two thirds of the interparietal 

 suture. It is circular, perforates the top of the cranium, an4 

 opens below as a smooth, inverted funnel-shaped cavity, 



