as so little is known of the vertebral column and limbs of the squalo- 
dont8 t the Hypothesis still appears tenable that the Belphinidae orig- 
inated from a stock distinct from the former, hut hairing somewhat sim- 
ilar tuberculate teeth. 
m 
he teeth of the fossil species hare been coaroared with the 
type-teeth of Delphlnod on men to andJX wyman.l, with the result that it 
can he referred with certainty to that genus , and probably is identi- 
cal with the latter species. The germs Delphlnodon, therefore, which 
— - 
has hitherto been regarded as belonging to the Squalodontldae , is now 
to be transferred to the family Dolphin idae. 
A full description of the fossil skeleton, with illustrati 
will be published by the national Museum at an early date. 
ons , 
Frederick W. True 
ashington, 2). C. , Jan. 25, I ail. 
