GEOLOGICAL SURVEY OF THE TEEEITORIES. 639 



Ehineastes peltatus, Cope. 



Proceed. Amer. Philos. Soe. 1872, 486. 



Established on cranial and otlier bones, with spines of a siluriform 

 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 Dorades. The frontal foutanelle 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 with 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 foutanelle 0.012 



Thickness at do 004 



Thickness at of casque 004 



Width spine 005 



Depth spine 009 



From South Bitter Creek. 



Ehesteastes eadulus. Cope, spec. nov. 



Represented 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°^. 



f'rom 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 

 vertebrae, 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 i^ectoral 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. 

 There 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. 



3Ieasurements. 



M. 



Diameter of a vertebra '. 021 



Length of centrum 009 



I)auseter of modified vertebra 013 



Diameter of groove of vertebra (505 



Diameter of occipital articulation ....'. 015 



L';ngth of cup of operculum 013' 



Diameter spine at base 008 



Diameter sijine at .004 from base 0037 



