244 s - w - WILLISTON. 



great width and depression, its width posteriorly being fully equal 

 to its length. The pitting of the upper surface is small and retic- 

 ulate, with a slight, though distinct, indication of longitudinal 

 ridges. The parietal and frontal bones posteriorly are slightly 

 concave in the middle. The nares are small, situated nearly at 

 the extremity of the muzzle, oval in shape and directed more 

 outward. In front of the orbits the face is a little constricted, 

 with the sides more strongly convex. From the front of the 

 orbits the lateral lobe of the cranium is convex outward to about 

 midway between the orbit and the hind border, where the curve 

 is slightly inward. There is a rather strong emargination of the 

 hinder border of the cranium in the middle, with the outer third 

 on each side gently convex or nearly straight. The large orbits 

 are located a trifle in front of the middle of the skull. They are 

 oval in outline, with the long diameter antero-posterior, meas- 

 uring eighteen millimeters in length by fifteen in breadth. The 

 plane of their margins is directed a little forward and upward at 

 an angle of about 45. The large pineal foramen is nearly mid- 

 way between a line drawn through the posterior margin of the 

 orbits and the hind border of the skull in the middle line. The 

 sutures of the skull are, for the most part, indicated by very deli- 

 cate lines, requiring a hand lens to follow. I have given such as 

 I feel sure of. The plane of the upper surface of the skull is 

 nearly horizontal as far forward as the front end of the orbits, 

 whence it slopes gently to the front extremity, with a slight con- 

 vexity. The mandibles are in position on the under side, slightly 

 pushed to the left. The symphysis is short, the rami rather 

 narrow in front, their outlines very much like those of the side 

 of the cranium, curving inward posteriorly. They are broadest 

 and deepest a little back of their middle, or opposite the trans- 

 verse bones, which abut against them. Distinct sutures for the 

 splenial, dentary and angular are seen anteriorly on the outer 

 side. The dentary ends by a broad curve upward, with the 

 slender prolongation of the angular enclosed between it and the 

 margin of the splenial below. At the hind extremity the small, 

 inwardly curved angular process is visible. The slight lateral 

 pressure upon the mandibles has left exposed the insertion of the 

 maxillary teeth of the right side, but the very delicate teeth them- 



