MONODON. 97 



maxillse convex and thick at nasal end, in the beak 

 smooth, flattened, 2| inches at the broadest, but broad 

 ahnost to tip. Superior maxilla3 rougher, distinct 

 external to preniaxillaj. Vertex cranii in same plane 

 as top of nasals. Pterygoids relatively small, meeting 

 mesially. No tusks protrude, and the sockets are 

 filled with bone. 2 ^ inches behind the right socket is 

 seen the tip of a rudiment of a second maxillary tooth 

 lying at the bottom of its socket. A similar socket 

 in the left maxilla has no rudimentary tooth in it. 

 Mandible absent. Goodsir Collection. 



2. Skull, with left tusk, which protrudes 3 feet. Right 



maxilla removed. No mandible. 



Goodsir Collection. 



3. Skull, young female, 13| inches long, 9 inches broad ; 



beak 6 inches long, 4^ inches broad at base. Naso- 

 premaxillary region similar to though less strongly 

 marked than in No. 1. Pterygoids separated by a 

 wide cleft mesiall}^ Tympano-periotics retained in 

 skull. Mandible 10 inches long, symphysis 1 inch 

 The right and left tusks have each reached the 

 mouth of the alveolus, but have not protruded. 

 One inch behind the right alveolus is a smaller 

 socket in which the end of an aborted tooth is 

 seen ; a similar left socket does not contain an 

 aborted tooth. 

 Davis Strait. Donor — Sir John Struthers, 1895. 



4. Skull, male, adolescent, 18^ inches long, 12 inches 



broad ; beak 9 inches long, 7 inches broad ; naso-pre- 

 maxillaries assuming adult characters ; pterygoids 

 partially united mesially ; tympano-periotics in situ. 

 Mandible 14 inches long, symphysis If inch. Left 

 tusk projects for If inch, right is concealed. Behind 

 each alveolus is a depression which may have lodged 

 a rudimentary tooth. 

 Davis Strait. Donor— Sir John Struthers, 1895. 



5. Skull, 20 inches long, 13i inches broad; beak 10| inches 



long, 7h inches broad. Right tympano-periotics in 

 situ. Mandible 16^ inches long, symphysis 2 inches. 

 The left tusk protrudes IH inches. The rudimentary 

 right tusk is entirely concealed. 



Donor — T. Graham Kerr, Esq. 



(). Skull, bones of fcftal, disarticulated ; the fcetus was re- 

 moved in December 1875 from a gravid uterus. No. 22. 



7 



