1884.] 54 J rCope. 



without intervening ridge. The posttympanic mass is broken away. It 

 is inferior in position to the auricular meatus. The latter, being directed 

 posteriorly, is considerably produced behind the postglenoid process, leav- 

 ing a wide postglenoid fossa. The postglenoid process is rather small, 

 and its posterior face is entirely covered by the tympanic bone, while its 

 interior edge is in close contact with the otic bulla. The bulla is of enor- 

 mous size, and is a slightly compressed oval placed anteroposteriorly. It 

 fills the entire space between the postglenoid process and the basicranial 

 axis, and reaches anteriorly almost to the line of the anterior border of 

 the glenoid region. The pterygoid process adheres to its internal wall 

 for half its length, and it sends forwards on the external side of the ptery- 

 goid, a narrow acuminate apex. The internal extremity of the glenoid 

 cavity is concave, and the surface descends, forming a robust peduncle, as 

 large as the postglenoid process, to which the anterior part of the otic bulla is 

 attached. This is a character I have not seen in any other species of the 

 family. A wide surface, continuous with that of the glenoid face, extends 

 on the external side of the pterygoid ala of the sphenoid, to the angle 

 where it unites with the pyramidal process of the palatine. It there termi- 

 nates abruptly, but the external angle marks the end of a ridge, which ex- 

 tends upwards and forwards to the postorbital process of the frontal. An^ 

 terior to this line the cranial wall is concave ; posterior to it, convex. The 

 processi pyramidales are divergent, and have thickened and rounded infe- 

 rior edges. The maxillary bones are produced a little beyond their bases, 

 leaving a notch between. The palatal surface is uniformly moderately 

 concave. 



The incisive foramina are large ; the septa are wanting in my speci- 

 mens, perhaps accidentally. The infraorbital foramen is above the middle 

 of the fourth premolar tooth. The frontal foramina are further apart than 

 in any other species of the family, being equidistant between the median 

 line and the supraorbital border. There is an internal orbital foramen be- 

 low the postorbital process, as in other species of the family. There are 

 three postparietal foramina, two of which are on the squamosal suture. 

 Below the anterior of these two is a large postsquamosal foramen. 

 No supra or postglenoid foramina. The meatus auditorius externus 

 looks equally externally and posteriorly. It is large and of oval out- 

 , line, the long diameter being parallel to the superior border, which 

 is the usual suprameatal crest. Its tympanic or anterior border is very 

 prominent, while the posterior border is a little less so. A posttym- 

 panic tuberosity marks the middle of the inferior edge. Posterior to 

 the meatus is the rather large mastoid foramen, which is above the in- 

 ternal base of the paroccipital process. The basicranial bones being lost, 

 the characters of the basal foramina are not determinable. The posterior 

 nares are deeper than wide. The palatonareal border is a Gothic arch, of 

 which the apex is opposite the posterior border of the last molar tooth. I 

 perceive no palatal foramina. 



The median and posterior nasal sutures remain. The latter is a V with 



