308 



PROCEEDINGS OF THE ACADEMY OF 



[June, 



Eigenmannina melanopogoa (Cope). Fig. 10. 



Anodus melanopogon Cope, Proc. Amer. Philos. Soc. Pliila., XVII, 1877-78 

 (May 17, 1878), p. 682. Nos. 21,227 (type) to 21,232, A. N. S. P., cotjijes. 

 Peruvian Amazon. Prof. J. Orton. Coll. of 1873. 



Width of head 3^ in its length; interorbital space 4^. Body, head 

 and caudal peduncle compressed. Upper surface of head narrow, 

 convex, and lower surface constricted. Snout rounded and convex 

 when seen from above. Jaws more or less flattened or spatulate. 

 Each ramus of mandible well elevated inside of mouth. Lips hardly 

 developed or very thin. Tongue small, narrow, rather thick, fleshy. 



Fig. 10. — Eigenmanmna melanopogon (Cope). 



and united with floor of mouth by a median fleshy frenum. Upper 

 buccal membrane rather narrow. Interorl^ital space a little elevated 

 convexly and flattened medianly. Gill-opening large, extending for- 

 ward till a little before front rim of orbit. Vent close in front of anal. 

 Color in alcohol more or less silvery, back brown fading to white on 

 sides and under surface. Top of head brown, sides and lower surface 

 silvered white. Fins pale brownish, dorsal and caudal a trifle darker, 

 and each ray of most fiixs speckled or spotted rather indistinctly with 

 darker brownish. Iris rather brassy. Length 2|- inches (caudal 

 damaged). Type. 



One example shows 35? + 54? slender rakers, and longest about 

 equals eye or much longer than filaments. 



With reference to the original description, Cope evidently intended 

 to state that the base of the first dorsal ray was three millimeters nearer 

 the end of the muzzle than the base of the caudal. Both pectorals and 

 ventrals reach m.ore than half way in the spaces stated. Cope evi- 

 dently counts 128 rows of scales from the occipital region, and those 

 on base of caudal. The origin of the ventral is below the bases of 



