426 GEOLOGICAL SURVEY OF THE TERRITORIES. 



ASINEOPS SQTJAMIFRONS, (COPE ;) 1. C., p. 381. 



General form is suboblong, the greatest depth just behind the head, 

 and contained two and a half times in the length, exclusive of caudal fin. 

 Eadii D. VIII, 14 ; A. II, 9 ; 0. 14 ; V. I, 7 ; P. Ul ? 13. Scales 5— <? 30—10, 

 vertical line counted a little behind the ventral fins. The line of the ex- 

 tremities of the second dorsal and anal fins marks the basal third of the 

 caudal fin. The dorsal spines are subcylinclric, slightly curved, and of 

 nearly equal length ; the length equals the depth of the body at the 

 middle of the second dorsal fin. 



The external series of villiform teeth are stout of their kind, conic, 

 and a little incurved. I cannot see the pharyngeal bones or teeth. 



The number of vertebrae which extend between the caudal fin and 

 the superior margin of the operculum, where one or more are concealed, 

 is twenty-five, of which fifteen are of the caudal portion ; (in two I can 

 only count fourteen.) 



The mouth is directed obliquely upwards and is rather large; the 

 mandible, when closed, does not project beyond the premaxillary border. 

 The maxillary, where preserved, is narrow distally, and does not project 

 beyond the posterior line of the orbit. The latter is rather small, and 

 though not well defined in any specimen, is not more than one-eighth the 

 length of the head, and 1.5 to 1.75 times inside of muzzle. The margins 

 of all the opercular bones are entire and smooth. The interoperculum 

 is narrow, and lies obliquely upward, narrowing the operculum. The 

 greatest width of the latter is more than two-thirds its depth. The 

 pelvic supports of the ventral fins are simple, slender, and in contact 

 anteriorly, their length about half that of the fin. The pectorals are 

 not elongate. 



The scales extend over the top of the head to, or beyond, the orbits. 

 They also extend along the ramus of the under jaw. Those of the fins 

 are quite small ; they extend to a considerable distance on the unpaired, 

 and on the caudal fin. 



Total length of the largest specimen 0.19 



Do. No. 2, smaller example (with caudal) 12 



Length of head of do 044 



Depth of do. posteriorly about 036 



Length of base of spinous dorsal 0265 



Length of posterior spinous ray 017 



Length of operculum 0125 



Length of maxillary bone about 0145 



Depth No. 3, at base first dorsal 045 



Depth No. 3 at base anal, first ray 0325 



Length of basis anal=basis caudal 0162 



Length of caudal fin 034 



Tertiary strata of Green Eiver, Wyoming ; Dr. F. V. Hayden, Coll. 

 Mus. Smithsonian. 



ASINEOPS VIRIDENSIS, (COPE;) Sp. nOV. 



This species is represented by an incomplete specimen, which lacks the 

 pectoral region and the end of the muzzle. It indicates its distinctness 

 from A. squamifrons in the increased number of anal radii. The ray 

 formula is, D. IX, 14; A. II, 12. There is, therefore, one dorsal spine 

 more than in A. squamifrons, though a single specimen, apparently of the 

 latter, has the same number. Vertebrae 25, of which 17 or 18 extend 



