337 



resembles the corresponding part of the lower teetli of the living Manatee of 

 the Florida coast, and it indicates an animal of about the same size. Tlie 

 constituent lobes of the crown are less contracted approaching the summits, 

 and the intervening valleys are wider than in the teeth of the living Manatee. 

 The summits of the lobes being less contracted, are also sliarper and not so 

 wrinkled. The summit of the anterior lobe presents a wider and deeper 

 oval pit, and the posterior heel is less mammillary, not wrinkled at the sum- 

 mit, and is broadly sloping at its fore part. The crown measures half an inch 

 four and aft and 4J lines where widest. 



Zeuglodontia. 



PONTOBASILEUS. 



PONTOBASILEUS TUBERCULATUS. 



Fig. 15, Plate XXXVII, represents a fragment of a remarkable tooth, 

 apparently belonging to an animal of the same order as the Basilosaurus. 

 The specimen pertains to the Museum of the Academy of Natural Sciences 

 of Philadelphia. It is without label, and was associated with some Basilosaurus 

 remains from Alabama. I suppose it to have been derived from some Eocene 

 or Miocene formation of the Atlantic States. Upon the fang there are the 

 remains of two white disks, apparently the basal attachment of barnacles. 



The fragment consists of the back portion of the crown and the corre- 

 sponding fang of a double-fanged tooth. The crown has been very unlike 

 that of any known animal of the order. The conical summit occupied a 

 position over the separation of the fangs, including at most the anterior one. 

 The back part of the crown forms a wide, thick heel, extending over more 

 than half the width of the corresponding faug. The enamel is exceedingly 

 tuberculate, and near the most prominent portion of the heel outwardly it is 

 worn off over a small oval space from attrition of an opposed tooth. The 

 fang is widely divergent, and is depressed along the middle externally and 

 internally, and also more deeply on the surface opposed to the absent fang. 



Cetncea. 

 Delphinid^. 



GRAPHIODON. 

 Graphiodon vinearius. 



Leidy : Pr. Ac. Nat. So. 1870, 122. 

 An extinct genus and species ol' cetacean animals, apparently dilFerent 

 43 o 



