6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 87 



edged crest is continuous with the corresponding portion of the 

 supraoccipital and together they form a prominent lambdoid crest. 

 The dorsal contour of the supraoccipital is uncertain since this por- 

 tion of the lambdoid crest has been destroyed. Between the upper 

 limits of the temporal fossae the supraoccipital is deeply concave. 

 The greatest breadth of the supraoccipital is about equivalent to its 

 vertical diameter above the foramen magnum. 



The foramen magnum is sub-oval in outline ; its transverse diame- 

 ter is 35 mm. and its vertical diameter 24 mm. The occipital condyles 

 are considerably broader near the apex than near the base, and their 

 articular surfaces curve outward and forward. Their internal faces 

 converge inferiorly and have a sharp hinder edge. The external mar- 

 gins of the occipital condyles are convex and are not set off from 

 the exoccipitals by distinct necks. The outer border of the left con- 

 dyle has been damaged and the entire articular surface of the right 

 condyle is missing. Below the occipital condyles and internal to the 

 exoccipitals are the descending plates of the basioccipital and they 

 in turn are separated from the large paroccipital processes by the 

 deep jugular incisures. 



Ventral view. — Near the base of the rostrum the ventral surfaces 

 of the maxillaries are closely approximated and the keel of the vomer 

 is entirely concealed. 



The lacrimal is closely appressed to the anterior face of the supra- 

 orbital process of the frontal and its internal end is mortised into 

 the ventral face of the maxillary; the anterior end of the jugal is 

 ankylosed with the lacrimal below the maxillary notch. Inasmuch 

 as no suture can be found it should be stated that these three bones 

 constitute the lower margin of the maxillary notch. 



The jugal is a long, slender bone consisting of a short triangular 

 enlarged anterior portion ankylosed with the lacrimal, and a styli- 

 form posterior process. The posterior end of the styliform process 

 is dorso-ventrally flattened and extremely thin, being loosely at- 

 tached to the ventral face of the zygomatic process. The jugal was 

 unavoidably removed during the preparation of this specimen. 



There is nothing peculiar about the position of the palatines. They 

 are suturally united medially in front and are closely appressed to the 

 under surfaces of the maxillaries. Viewed from the side, the palatine 

 extends forward beyond the level of the maxillary notch and projects 

 backward above the external reduplication of the pterygoid to the 

 anterior margin of the optic canal. Close to its posterior extremity, 

 the palatine presumably comes in contact with the orbitosphenoid 

 which lies above it. 



