192 



Lines. 



Breadth of first vertebral centrum 10. 



Length of second vertebral centrum 4. 4 



Breadth of second vertebral centrum 7. G 



Length of third vertebral centrum 5.0 



Breadth of third vertebral centrum G. 8 



A number of large ganoid scales, of the same character as the prccedim:. 

 were collected in a sandstone stratum on Little Sandy Creek, during Pro- 

 fessor Hayden's expedition of 1870. Several of these selected from the collec- 

 tion are represented in Figs. 35 to 38. 



A number of similar scales were obtained by Dr. Carter in the vicinity 

 of Fort Bridger. Figs. 30 to 42 represent several of the scales selected from 

 the collection. 



Fig. 43 represents a scale of a Lepidosteus found in association with the 

 large saber-like canines described in the preceding pages, and supposed to 

 belong to Uintatherium. 



Lepidosteus notabilis. 



A vertebral centrum partially imbedded in a yellowish sandstone contain- 

 ing casts of shells was obtained near Washakie, Wyoming, during Professor 

 Hayden's exploration of 1870. 



The centrum is represented in Figs. 12, 13, and appears to indicate a fish 

 related with Lepidosteus, but probably of a different genus. It pertains to 

 an anterior dorsal, and is about the size of a corresponding centrum of the 

 alligator-gar, but has the parapophyses much shorter. The centrum also 

 differs in shape from those of the alligator-gar. The lower surface is broad 

 and flat, and is marked with longitudinal curved and furcate ridges. The sides 

 are perpendicular and depressed in a deep fossa beneath the parapophyses 

 In the alligator-gar the sides slant outwardly from the lower surface. 



The posterior end of the centrum of the fossil is four-sided, with the 

 widest border above and convex, the shortest below and straight, and the 

 lateral borders slanting with a slight sigmoid course. 



The short parapophyses project from the upper part of the centrum nearly 

 from the middle. 



The measurements of the specimen are as follows : 



Lines 



Length of cen trum interiorly ; S 



Height of centrum posteriorly 9 



Breadth of centrum at upper part 10 



Breadth of centrum at lower part 6 



Breadth of centrum, including parapophyses 13 



