New to the United States. 5 



but one specimen of /. 1m<l*<>iun.$ in which the premolar is absent. 

 This I suppose to be the skull from Pennsylvania referred to, on 

 the authority of Mr. F. W. True, in the original description of 

 Z. itisignis. The specimen (No. 1 5 6 5 8 8 4 ? United States National 

 Museum, Upper Darby, Pa.) is in a very fragmentary condition, 

 but one tooth row remaining in situ, and the maxilla being 

 broken off close to the roots of the first molar. Under these 

 circumstances no weight can be placed on the fact that the pre- 

 molar is not to be found. 



