22 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 69 



optic nerve is marked by a deep groove which traverses the ventral 

 surface of the orbitosphenoid to its extremity. Beyond the orbito- 

 sphenoid the optic nerve followed the channel on the supraorbital 

 process of the frontal. The position of the foramen rotundum is 

 uncertain. 



Measurements of the skull (in millimeters) 



Cat. No. 

 8060 



U.S.N.M. 



Total length (occipital condyles to extremity of rostrum) 



Length of rostrum (antorbital notches to extremity) 



Breadth of skull across zygomatic processes of squamosals 



Height of skull (between inferior margin of falcate process of 



basioccipital and dorsal surface of nasal bone) 



Height of skull (basisphenoid to nasal bones) 



Greatest breadth of skull across supraorbital processes (an- 

 teriorly) 



Occipito-premaxillary length of skull (posterior margin of 



maxilla to extremity of rostrum) 



Greatest distance between outside margins of premaxillae 



opposite respiratory passages 



Greatest breadth of right premaxilla in front of respiratory 



passages 



Greatest breadth of right premaxilla at antorbital notch 



Breadth of rostrum at level of antorbital notches 



Greatest breadth of rostrum at anterior extremities of 



maxillae 



Greatest length of cranial plate of right maxilla 



Greatest width of cranial plate of right maxilla 



Distance between inner margins of maxillae at vertex 



Greatest breadth of supraorbital process of right frontal 



(preorbital margin to extremity of post-orbital projection) . 

 Greatest tliickness of frontal and maxilla combined on outer 



margin and near center of orbit 



Maximum width of exposed portions of combined frontals 



on vertex 



Greatest anteroposterior diameter of exposed portion of 



right frontal on vertex 



Greatest anteroposterior diameter of right nasal 



Greatest transverse diameter of right nasal 



Least breadth of cranium between temporal fossae 



Distance from center of transverse crest of supraoccipital 



to upper margin of foramen magnum 



Height of foramen magnum (as preserved) 



Width of foramen magnum (as preserved) 



Greatest distance between outer margins of occipital condyles. 



Greatest height of right condyle 



Greatest breadth of right condyle 



Greatest length of right zygomatic process 



Greatest length of styliform process of right jugal 



Greatest distance between outside margins of exoccipitals 



Greatest vertical depth of skull in front of respiratory pas- 



Distance across median region of basicranium between pos- 

 terior extremities of falcate processes of basioccipital 



Distance across median region of basicranium between pos- 

 terior extremities of internal plates of the pterygoids 



Distance from proximal alveolus to distal alveolus, inclusive, 

 on right side of the rostrum 



298 

 185 



73.8 

 50.5 



116.4 



277 



47 



22.5 

 15. 5 



68 



17.5 



88 



42. 5 

 25 



56 



6 



23.5 



14 



18.5 

 19 

 x 



X 

 X 



23 



48 



X 



17 



41. 1 

 60.4 + 

 108 



40 



55 



X 



171.5 



'Estimated. 



