-NO. 1875 



NEW FOSSIL CETACEAN — TRUE 



449 



nearly horizontal. The internal surface below the apex of the coro- 

 noid process is concave. 



The condyle is oval, small, and projects outward strongly. Orig- 

 inally it was about 50 mm. deep and 35 mm. broad. The orifice of 

 the inferior dental canal is situated about 180 mm. anterior to the 

 condyle and appears to have been relatively small. Opposite the 

 penultimate tooth the jaw is 33 mm. broad. 



The alveoli are shallow, the penultimate one being about 19 mm. 

 deep. The septa between the molars are not more than one or two 

 millimeters thick, but appear to have reached the level of the superior 

 margin of the jaw when complete. The teeth themselves were very 

 close to each other, if not actually in contact. 



Teeth 



All the teeth are closed at the roots, and, with one exception, have 

 a large part of the crown worn away, indicating (as do the vertebrae) 

 that the individual was adult or old. The dimensions of the several 

 teeth preserved are given below. The separate teeth are referred 

 to by the numbers of the figures on plate xliv. 



Diinensio7is of teeth of Prosqualodon a it straits 



1 Alveolus. 

 - Crown worn. 



3 Three-rooted, crown somewhat worn. 

 ■* Crown lacking. 



