634 GEOLOGICAL SUKVEY OF THE TERRITORIES. 



with a thick hiyer ot' dense bone, which has not the brilhaut surface 

 of jranoiue. This substance is thrown into elevated corrugated ridi;os, 

 which are generally transverse to the long axis of the bone, and inosiii- 

 late and are iutcrrnpred frequently. The spaces between are as wide as 

 the bases of the ridges. 



Measiiteincnts. 



Widrhof bone O-S-2 



riiiokuoii-^ ot" boue 012 



round in the Bad Lauds of Ham's Fork. 



Clastes axkox, Leidy. 



LcpiHosiats atrox. Leidy. Proceed. Acad. Xat. Sci., Philada., Ifl^. 



Abundant, and represented by both rough and smooth scales, the 

 former from tlie anterior part of tiie body. 



ClASIES CYCLIFEKrS, Cope, 



Established on numerous remains of a small species, in which the 

 scales are rather wide, and generally with obtuse extremital angles, and 

 frequently in certain regions of the body entirely rounded at the pos- 

 terior border. Fragments of the cranial bones are ornamented with 

 scattered tubercles of gauoine of rouuded form, and not distribured in 

 lines, as in some species. In a fragment from the posterior part c>f the 

 mandible there is a single row of large teeth, with a series of minute 

 ones between them, on the outer edge of the bone. The external tace 

 presents a smooth superior surface, and a rugose inferior portion which 

 is marked by iri^egiilar lines of points of g-anoine. 



Meiisurements. 



M. 



Depth of dent.iry bone 0070 



Width oi deut.iry above 0«>55 



Leugth of a scale, y^exi>«>sed face^ OCHJO 



Width of a scale. ;^exposed foee) 0060 



Thickuess of cranial boue 



From Mammoth Buttes. 



Clasies glabee. Maish. 



Z<7>!(fo*u'HS glahir. Marsh. Proceed. Acad. Xar. Sci.,. 1ST. 

 Abundant, 



rAPncnTnYS. cope. 



Gen. nov. Halecomorphornm. 



Family Amiidat : Vortebnv short, the dors;il with prominent dia- 

 jH^physis : the sides of the centrum striate-grooved. Maxillary Kme with 

 a supplementary boue on its distal upi>er bonier, and supporting a single 

 series of teeth." Dentary boue with but one series of teeth : surface of 

 cranial bones sculptured. 



This genus ditfei-s from the existing Awia, in the presence of only one 

 series of teeth, instead of several, on the bones alH-»nt the mouth. The 

 IHisterior part of the dentary K^ne. or perhaps another element, is cov- 

 eivd with tine graniform teeth, as in Amia coltyt. 



Species of the genus ai-e uiimerously ivpivsenteii in the l>etis of the 

 Bridger Eocene. Some of them have been referreil to AmUi by Miu^b, 



