458 



PROCEEDINGS OF THE ACADEMY OF 



[Oct., 



opposite posterior nostril. Rakers 10 + 14, lanceolate, and longest 

 about f of orbit or about equal to longest filaments. Scales all more or 

 less striate. Tubes in lateral line simple. Color in alcohol brown, 

 lower surface little paler, and body everywhere more or less silvered. 

 Fins all pale brown, without markings, and a brownish blotch on 

 anterior anal rays. An indistinct or grayish blotch above and on 

 lateral line, well behind shoulder, about size of orbit, and another at 

 base of caudal. A brassy shade from gill-opening above broadly 

 back over side. Iris reddish-brown, pale below. Length 5^ inches 

 (caudal damaged). Type of Rcehoides ruhrivertex Cope. 

 Roeboides bicornis Cope. Fig. 47. 



Proc. Amer. Philos. Soc. Phila., XI, 1869-70 (August 19, 1870), p. 564, 



fig. (teeth). Type, No. 8,151, A. N. S. P. Pebas, Eastern Equador. 



John Hauxwell. 



Width of head 3f in its length ; interorbital space 3f . Body strongly 

 compressed. Head well compressed. Snout about as broad as long. 

 External denticles well developed, 2 median large and directed for- 



Fig. 47. — Rceboides bicornis Cope. 



wards, 2 lateral subequal on upper jaw, and 4 mandibulars equally 

 placed. On each side of upper jaw a well-developed canine, and 2 

 series of smaller similar teeth between or in front, other teeth all 

 smaller and uniserial. Small teeth in mandible with 4 canines, an- 

 teriorly median pair close or at symphysis. Maxillary with a number 

 of large denticles of rather irregular size. Tongue long, slender and 



