9 8 



reaching to the clavicle ; the internal curves to meet the cor- 

 responding portion of its fellow. The ventral radii are eight 

 in number, and the caudal fin is furcate. The scales are pe- 

 culiar, and characteristic of the genus. They are very thin, 

 and have borders fringed with long, close-set, bristle-like 

 processes. This genus includes as yet only three species : 

 T. hians, from Osivio, Nev. ; and T.foliarum and T. Copei, from 

 Florissant, Col. 



TRICOPHANES COPEI, sp. nov. 



Vertebrae D. 12, C. 18, Radii D. 14, A. 8, V. 8, C. 41, P. 

 5 only visible, not all preserved. The dorsal fin is long, and 

 projects beyond the beginning of the anal fin ; the mouth is 

 terminal, and the muzzle rather sharp. All the bones of the 

 skeleton are very slender ; and this is especially true of the 

 ribs, which are not as thick as the interneurals. The neural 

 and haemal spines are short and slender. The origin of the 

 dorsal is nearer to the muzzle than to the caudal ; though, as 

 a whole, the fin is on the hinder half of the body. There are 

 no interneural spines in front of the dorsal fin ; those sup- 

 porting the fin are short, slender, and without the laminar 

 expansions found in T.foliarum. The caudal fin consists of 

 numerous jointed rays, which are supported by the neural 

 and haemal spines of the last three vertebrae. The scales are 

 small, and exhibit the peculiarities of the genus, but the rows 

 are too imperfect to be counted. 



Measurements. 



M. 



Total length (straight) -0935 



Length of head -018 



Length of vertebral column. -055 



Length of caudal fin * -024 



Length of dorsal spine -on 



Length of anal spine -009 



Depth of head posteriorly -016 



Length of mandibular ramus -oio 



Length to dorsal fin (from muzzle) 033 



Length of dorsal fin -0135 



Depth of body at middle of dorsal fin -017 



Found in the insect beds at Florissant, Col. 



