SCIUROMORPHA. 841 



and reaching the otic bulla. The latter are large and obliquely placed ; 

 the meatal borders are produced into a short tube, which is not so long as 

 that of the C. fiber. Its superior border is quite prominent, overhanging the 

 inferior, and projecting more than represented by Mr. Filhol in the C. vicia- 

 censis. There is a strong ridge of the squamosal bone extending posteriorly 

 from the base of the zygomatic process, which overhangs a fossa. This 

 fossa is further defined posteriorly by the tympanic tube. This fossa is 

 larger and deeper than in either C. fiber or C. viciacensis. Below its superior 

 bounding ridge is a large subsquamosal foramen. The mastoid bone is 

 distinctly exposed between the squamosal and occipital, and its surface is 

 separated from that of the former by a groove which is not so well marked 

 in the C. fiber. Its inferior angle is in contact with the bulla, and is shorter 

 than the paroccipital process. The latter is short, not extending below the 

 line of the condyles, and is directed downwards, not posteriorly as in C. 

 fiber. The occiput is nearly vertical and flat, excepting laterally, where 

 there are two fossa?, a superior and inferior, the latter the longer, and ex- 

 tending to the inferior surface. 



The premaxillo-maxillary suture is just half way between the anterior 

 molar and the superior incisor, and is vertical to opposite the middle of the 

 incisive foramen, and then turns backwards. The frontomaxillary and 

 frontonasal sutures are in one transverse line across the front. The malar- 

 maxillary suture is behind the anterior border of the zygoma, thus con- 

 fining the malar bone to the zygoma. The latter is much expanded in a 

 vertical direction, but has no postorbital angle, resembling in this respect 

 the C. viciacensis rather than the C. fiber. Its posterior portion extends well 

 posteriorly and below almost all of the squamosal part of the zygoma. 

 The parietal is of a parallelogrammic form; the anterior inner border cut 

 obliquely by the frontal, and the posterior inner border cut out for the 

 supraoccipital. The latter bone has an oval form, narrowed anteriorly and 

 truncate posteriorly. 



I describe a mandibular ramus of a second individual. It unfortu- 

 nately has the coronoid and the angle broken off. The base of the latter 

 is concave on the inner side. The external face of the ramus is every- 

 where convex. The base of the coronoid is separated from the molar line 



