ART. 1'6 REMAINS OF FOSSIL PORPOISES KELLOGG 35 



deiined pit on each side of it below the nasals the frontal fontanelle 

 was completely closed and no trace can be found of foramina which 

 would afford passage for the olfactory nerves through the ecteth- 

 moids. To make certain that these foramina were not hidden by 

 matrix, that portion of the bone which incloses the pit on the left 

 side was removed and carefully examined. The jugals and their 

 long styliform processes are missing. Both lachrymals are preserved 

 even though the forward projecting processes of the horizontal 

 plates of the maxillae which normally overlie them are broken off 

 near the anterior margin of the supraorbital processes of the frontals. 

 Tlie right and left supraorbital processes are essentially complete 

 except for the loss of their postorbital projections. The outer margin 

 of the maxilla above the right temporal fossa is imperfect. The 

 nasals are more rounded than those of the other skulls. On each side 

 above the foramen magnum there is a vacuity in the supraoccipital 

 approximately 38 mm. w^ide wdiich has resulted from some accident, 

 probably from the dislodgment of the exoccipitals. , Between these 

 vacuities there is a median strip of the supraoccipital averaging 31 

 mm. in width which maintains the correct relations between the base 

 and the top of the skull. Both exoccipitals are lost. All of the right 

 and left squamosal bones, including their zygomatic processes, are 

 missing. The extremities of the alisphenoids are damaged. The 

 descending plates of the basioccipital are not complete. No remnants 

 of the pterygoids can be found on either side. Both parietals are 

 lost. 



Occurrence. — Near latitude 38° 40' north, and longitude 76° 41' 

 west. South Chesapeake Beach, on the western shore of Cliesapeake 

 Bay, Calvert County, Maryland. Shown on Patuxent Quadrangle 

 or Pateuxent Folio, No. 152, United States Geological Survey. 



Horkon.—ThQ skull was found by F. W. True on March 30, 1907, 

 in clay on the shore at a point immediately north of the Sunset 

 Hotel, Chesapeake Beach. It lay in bluish clay about a foot above 

 the beach. The skull was turned upside down, and the right frontal 

 bone v^'as exposed. The long axis of the skull was at an angle to the 

 face of the bank. The skull belongs to Shattuck's zone No. 5. 



MecifiHrc'inents of the skull 



mm. 



Total length (occipital condyles to extremity of the rostrum) 842 



Length of rostrum (maxillary notches to tip of beak) 649 



Height of skull ( basisphenoid to nasals) 118 



Greatest breadth of skull across supraorbital processes of frontals (an- 

 teriorly) 196. 5 



Occipito-premaxillary length of skull (posterior margin of maxilla to 



tip of rostrum) 803 



Greatest distance between outside margins of premaxillae opposite nasal 

 passages 95 



