GEOLOGICAL SURVEY OF THE TERRITORIES. 639 



Khineastes peltatus, Cope. 



Proceed. Amer. Philos. Soc. 1872, 486. 



Established on cranial and other bones, with spines of a silurifonn 

 fish of the size of the largest species of Amiurus. The form in the ex- 

 cessive rugosity of the external long surfaces reminds one of some of the 

 Brazilian Borades. The frontal fontanelle is closed, though very dis- 

 tinctly marked by a groove of the surface not rugose. The rugosity 

 consists of innumerable, packed osseous papillae. The cranial ossifica- 

 tion is continued posteriorly as a shield, which is strongly convex from 

 side to side. The spine is symmetrical, and probably dorsal. It is com- 

 pressed and curved antero-posteriorly, and is deeply grooved behind. 

 Laterally it is closely striate-grooved ; the anterior face is narrowed, 

 obtuse, and minutely serrate w'ith cross ridges ; each side of it is rugose, 

 with several irregular series of pronounced tubercles arranged trans- 

 versely. 



Measurements. 



M. 



Width frontal bone near front of fontanelle 0. 012 



Thickness at do ^^^-^ 



Thickness at of casque f - 004 



Width spine 005 



Depth spine 009 



From South Bitter Creek. 



Ehineastes eadulus. Cope, spec. nov. 



Eepresented by numerous broken cranial bones, which present a pat- 

 tern of exostosis quite distinct from that observed in other species. This 

 consists of closely placed crenate ridges, which radiate from various 

 points and are sometimes broken up, but always rough or serrate on the 

 edges. The bones are not so thick as in the last species ; i. e., .0025"^. 



From Bad Lands of Cottonwood Creek. 



Ehineastes smithii, Cope. 



Proceed. Amer. Philos. Soc, 1872, p. 486, (August 20.) 



Eepresented by remains of several individuals, including one with 

 vertebrse, basi-occipital, opercular, and other cranial bones with spines. 

 They indicate a fish of the size of the large cat-fishes of the Ohio Eiver. 

 The pectoral spines are quite compressed and distinctly striate-grooved 

 on the sides. The posterior groove is occupied by short, spaced, recurved 

 teeth ; the anterior by an acute edge bounded by a groove on each side, 

 which has a fine, close serration. The surface of the modified vertebral 

 mass is striate-ridged ; that of the basi occipital still more strongly ridged. 

 Tliere is a median pit behind, and the points of attachment of the in- 

 ferior limb of the posttemporal is in front* of it, smooth, and without 

 reverted edges. The operculum has a large, compressed, sessile cup, and 

 its external surface is strongly ridged and grooved, radiating from above 

 in front. 



Measurements. 



M. 



Diameter of a vertebra 021 



Length of centrum 009 



Dameter of modified vertebra 013 



Diameter of groove of vertebra 005 



D iamcter of occipital articulation 015 



L'Migth of cmp of operculum 013 



Diameter spine at base 008 



Diameter spine at .004 from base 0037 



