SUPPLEMENTARY NOTICES 



OF 



FISHES FROM THE FRESHWATER TERTIARIES OF 

 THE ROCKY MOUNTAINS. 



EHINEASTES, Cope. 



Hayden's Annual Eeport, 1872, 638. 

 Ehineastes pectinatus, sp. nov. 



This catfish is represented by a single specimen, which includes only 

 the inferior view of the head and body anterior to the ventral fins. 

 These exhibit characters similar in many respects to those of Amiurus, 

 E.af. J but the introperculum, the only lateral cranial bone visible, dis- 

 plays the dermoossifled or sculptured surface of the Eocene genus, to 

 which I now refer it. Other characters are those of the same genus. 

 Thus the teeth are brush-like, and there is an inferior limb of the post- 

 temporal bone reaching the basi-occipital. The modified vertebral mass 

 is deeply gTooved below, and gives off the enlarged diapophysis that 

 extends outward and forward to the upper extremity of the clavicle. 

 The patches of teeth on the premaxillary are separated by a slight 

 notch at the middle of the front margin. The teeth are minute. The 

 four basihyals and the elongate anterior axial hyal are distinct; also the 

 ceratohyal with its interlocking median suture. The number of branchi- 

 ostegal radii is not determinable; there large ones are visible. The 

 mutual sutures of the clavicles and coracoids are interlocking, and their 

 inferior surface displays grooves extending from the notches. The 

 pectoral spine is rather small, and bears a row of recurved hooks on its 

 posterior face; there are none on the anterior face. 



The head is broad, short, and rounded in front, which, with the uncinate 

 character of the serration of the pectoral spine, reminds one of the exist- 

 ing genus Woturus. As compared with the five species of Ehineastes, 

 described from the Bridger Eocene, the present species is distinguished 

 by the small size and large uncini of the pectoral spine. 



Measurements. 



M. 



Length of head to clavicle (below) 0.0180 



Width of head (below) 0360 



Width of scapular arch (below) 0110 



Expanse of modified diapophyses 0200 



Length of modified vertebrae 0115 



Length of pectoral spine 0210 



From the Tertiary shale of the South Park, Colorado. 

 4b 



