ART. 26 KEMAINS OF FOSSIL PORPOISES KELLOGG 37 



broken off near its origin. The anterior half of the outer border of 

 the right supraorbital process is missing. 



The right zygoma is nearly perfect, but the left one is fractured 

 behind the postglenoid process. In the right temporal fossa a 

 small fragment of the parietal remains. The alisphenoid is con- 

 siderably damaged on both sides, so much so that most of the 

 foramina are obliterated. The outer and lower extremities of both 

 exoccipitals are damaged. The supraoccipital is lost except for a 

 small piece attached to the right frontal. From a ventral view the 

 vomer is seen to be greatly constricted between the nasal passages, 

 forming a narrow trough. The internal plate of the pterygoid and 

 its external reduplication are completely missing on both sides. 

 The lachrymals and jugals are missing. The palatines are damaged 

 along their external margins. The mesethmoid is lost. No septa 

 between the alveoli are preserved. 



Occm^rence. — No definite information regarding the place of dis- 

 covery of this specimen can be found in any of the notes left by 

 William Palmer. All that is known is that it was obtained from 

 the Calvert cliffs, on the western shore of Chesapeake Bay, at some 

 point between Dare's wharf and Chesapeake Beach. The clay 

 matrix and mollusca within the brain cavity show that the specimen 

 came from the Calvert formation. 



Measurements of the skull 



III m . 



Total lengtli (occipital condyles to extremity of rostrum) 497..') 



Length of rostrum (maxillary notches to extremity) - 287.5 



Breadth of skull across zygomatic processes of squamosals 245 



Height of skull (between tip of descending process of basioccipital and 



frontals) 177 



Height of skull (basisphenoid to frontals) 131 



Greatest breadtli of skull across supraorbital processes 250 



Greatest distance between outside margins of premaxillae opposite nasal 



passages 111 



Greatest breadth of left premaxilla in front of nasal passages 44 



Breadth of rostrum at maxillary notches 126. 4 



Length of frontal plate of left maxilla 169 



G^reatest breadth of left maxilla at level of posterior margin of supra- 

 orbital process of frontal 100 



Distance between inner margins of maxillae at vertex 55 



Greatest anteroposterior length of left supraorbital process of frontal__ 76. 2 



Maximum width of exposed portions of combined frontals on vertex 92 



Greatest length of exposed portion of left frontal on vertex 25 



Distance from vertex to lower margin of foramen magnum 



Breadth of foramen magnum 40. 5 



Greatest distance between outer margins of occipital condyles 92. 2 



Greatest breadth of right condyle 35 



Greatest length of left zygomatic process, as preserved 86. 4 



Breadth of skull across exoccipitals 203.5 



Breadth of skull across zygomatic processes of squamosals 245 



