98 PROCEEDINGS OF THE ACADEMY OF 



Lepidosteus. Another species, indicated b}' remains accom- 

 pan3-ing tlie preceding, was about the size of the Gar pike, Lepi- 

 dosteus osseus^ and is propably one of those named b}' Prof. 

 Marsh. A posterior dorsal lias the centrum about 5;] lines in 

 length, and an accompanying caudal centrum is 5 lines in length. 

 This was likewise provided with smooth flat scales. 



Lepidosteus simplex. A species approximating in size the 

 Alligator Gar, is indicated b}- some remains collected b}- James 

 Stevenson, of Prof. Hay den's party of 1870, near Washakie Station. 

 The articular cup of the basi-occipital bone is five lines high and 

 ten linrs wide. The centrum of the atlas is four lines long and 

 ten lines wide. The accompanying scales arc flat and smooth. 



Lepidosteus notabilis. Founded on the centrum of an anterior 

 doraal imbedded in a block of sandstone with casts of fresh-Avater 

 shells, from near Wasliakie. The size of the centrum is about 

 equal to a corresponding one of the Alligator Gar, but the para- 

 l)oplyses are proportionately short. The under surface of the 

 centrum is broad, flat, and marked with longitudinal furcate 

 ridges. The sides are perpendicular, and not slanting as in the 

 Alligator Gar. The length of the centrum is 8 lines. 



Amia (Protamia) uintaensis. Lidicated by vertebral centra, 

 discovered by Dr. J. Van A. Carter, near Dry Creek Canon. The 

 fish was proportionately broader in relation with its length than 

 in the living Mud-fish, and was very much larger. The centruui 

 of an anterior dorsal is about double the length, and four times the 

 breadth of the same bone in Amia calva. The two ridges at the 

 bottom of the centrum in the latter are substituted by two oval 

 fossje. The length of the centrum is about 5^ lines, its height an 

 inch and a quarter, and its breadth an inch and three-quarters. 



An atlas, probably belonging to the same species, flat in front 

 and cupped behind, has nearl}'^ the same size. 



Amia (Protamia) media. Lidicated by remains from the junc- 

 tion of the Sandy and Green Rivers, collected in Ilayden's expe- 

 dition of 1870. A vertebral centrum from near the forepart of 

 the dorsal series, indicates a species about twice the size of Amia 

 calva. A pair of fossre at the bottom of the centrum substitute 

 the two ridacs in the latter. The length of the centrum is 5i 

 lines, its height 10 lines, and its breadth 13 lines. 



Amia (Protamia) (Jracilis. A smaller species than Amia calva, 

 indicated by a middle dorsal centrum. Its length is 1.18 lines, its 

 height 3.4 lines, and its width 3.8 lines. 



Hypamia elegans. a related genus to Amia is indicated by 

 a vertebral contrum, discovered by Dr. Carter on Dry Creek. The 

 specimen from the middle of the dorsal series, has its sides con- 

 vergent below in a median [>rominence excavated into a pair of 

 oval fossie. The species was rather larger than .1. calva. The 

 length of the centrum is 2.2 lines, its depth G.5 lines, and its 

 breadth 7.G lines. 



