SYSTEMATIC REVISION 25 



"The occiput is excavated into a large fossa on each side of a large triangular 

 supraoccipital region. The fossae are bounded externally by a strong exoccipital 

 crest and at the anteroinferior corner by the 'ophisthotic' This bone projects 

 posteriorly and downwards, in the form of a robust hook. The foramen magnum 

 is not excavated so abruptly above the exoccipital facets as in Empedias molaris. 



"Measurements. 



M 



"Interorbital width 0.108 



Length from supraoccipital crest to frontonasal suture 135 



Width between apices of tuberosities of the intercalaria 113 



Length from apex of tuberosities to inferior extremity of quadrate 129 



Diameters of quadrate condyle: 



Anteroposterior 020 



Transverse 039 



Length of maxillary on alveolar edge 087 



Diameters of base of a posterior tooth: 



Anteroposterior 007 



Transverse 010 



Diameters of base of another posterior tooth: 



Anteroposterior 005 



Transverse 010 



"A femur, which is included in the lot of specimens, 

 has a wide head without trochanters, convex in the plane fofijjS!^"*"" V'. 



of the distal condyles and flat in the direction at right angles f PKfv v ^ % ' 



to it. There is a huge trochanteric fossa extending from the V w 1 . 



head two-fifths the length to the condyles, bordered by a K;» 1 



ridge on each side. The condyles present in the same MRsf vXiH 



direction as the fossa posteriorly. They are separated by 

 a deep anterior and posterior emargination. Their ante- ■, .,.. 



rior edges overhang the condylar articular surfaces, making r» ^.Vjpj 



acute angles with them. One of the articular surfaces is |(| JT 



smaller, is anteroposteriorly extended, and has a convex h jMfll 



ectad, and concave entad border. The other surface is /' ' |M| 



also anteroposterior, reaching further distad, but not so far 

 proximad as the other. Its area is greater than that of the J&£ , 



other, and it is deeply notched by the entering surface of the /&£ nA 

 bone ectad and proximad. It is then contracted into a 

 wide isthmus, and the lateral grooves which produce this 

 isthmus are overhung by the expansion of the anterior 

 face. The anterior face of the femur is without ridges or 



Fig. c. — No. 45 C7 Am. Mus. 



processes. 3 *" 



Anterior view of right femur of 

 Chilonyx. X J. 



"Measurements. 



M 



"Length of femur 0.256 



Proximal diameters of femur: 



Anteroposterior 047 



Transverse 085 



Width of shaft 052 



Width distally (greatest) nc" 



Revised description of the genus and species: The teeth described as the type 

 are imperfect incisors and might belong to any species of the genus Diadectes. The 



