34 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.66 



Measurements of the skull 



mm. 



Total length (occipital condyles to extremity of rostrum) 794 



Length of rostrum (maxillary notches to tip of beak) 587 



Breadth of skull across zygomatic processes of squamosal 239 



Height of skull (between tip of descending process of basioccipital 



and nasals 179 



Height of skull (basisphenoid to nasals) 140 



Occipito-premaxillary length of skull (posterior margin of maxilla 



to tip of rostrum) 743 



Greatest breadth of skull across supraorbital processes 224 



Greatest distance between external margins of premaxillae at level of 



nasal passages 108 



Greatest breadth of left premaxilla in front of nares 47. 5 



Greatest breadth of left premaxilla at maxillary notch 46. 5 



Breadth of rostrum at maxillary notches 126. 5 



Greatest length of fi'ontal plate of right maxilla 164 



Greatest breadth of right maxilla posterior to nasals 87. 5 



Distance between inner margins of maxillae at vertex 66 



Greatest antero-posterior length of supraorbital process of right frontal 68. 5 



Greatest thickness of frontal, lachrymal, and maxilla combined in front 



of right orbit 30 



Maximum width of exposed portions of combined frontals on vertex 98 



Greatest length of exposed portion of left frontal at vertex 32. 5 



Anteroposterior diameter of left nasal (along suture) 25.5 



Transverse diameter of left nasal 26 



Distance from vertex to upper margin of foramen magnum 102. 5 



Height of foramen magnum 39 



Breadth of foramen magnum : 36 



Greatest distance between outer margins of occipital condyles 89. 8 



Greatest height of right condyle 51.2 



Greatest breadth of right condyle 32. 7 



Greatest length of left zygomatic process (as preserved) 78.8 



Breadth of skull across exoccipitals 201 



Greatest vertical depth of skull in front of nares 94 



Breadth across posterior ends of descending processes of basioccipital 107 



Breadth across anterior ends of descending processes of basioccipital . 01 



Breadth of skull across zygomatic processes of squamosals 237 



INDIVIDUAL 3 



Skull, Cat. No. 10464, Section of Vertebrate Paleontology, United 

 States National Museum. 



Although the skull from a dorsal view (pi. 16, fig. 2) appears to 

 be in a fair state of preservation, this condition unfortunately does 

 not extend to structures not visible from this view. The extremity 

 of the rostrum, the teeth, and the ear bones are missing. On the left 

 side of the rostrum in the groove between the maxilla and the pre- 

 maxilla and at a point 248 mm. in front of the maxillary notch, 

 there is a large foramen. Notwithstanding the fracture across the 

 base of the rostrum, the premaxillae were little damaged by that 

 accident. The mesethmoid is present, and although there is a well- 



