142 MEMOIRS OF THE CARNEGIE MUSEUM. 



in front of, the vertical from the eye; dorsal and ventral profiles behind the head 

 almost straight. 



Snout long, tubular, decurved, of small diameter and tapering; mouth small, 

 terminal; gape 1.5 to 2 in the eye; lower jaw included on the sides, slightly pro- 

 jecting in front; teeth small to medium, conical, in two irregular median patches 

 in upper jaw and two irregular series on lower jaw; eyes quite small; mucous pores 

 abundant on the head. 



Caudal small, fan-shaped, terminal, 2.5 times the eye; pectorals about 2.75 in 

 the head ; origin of the anal about three times the eye behind the vertical from the 

 eye. 



Ground-color a uniform bistre to dark brown; head and dorsal parts darker; 

 lateral line hyaline; fins hyaline, rays faintly outlined with dark brown. 



The type of oxyrhynchus was examined by Dr. C. H. Eigenmann. His notes 

 follow. 



"Type in the Berlin Mus. 470 mm. No. 4086, Guiana, Schomburgk. 



"Head 6.9 in the length to the end of the anal; anal 215; interorbital 18 in 

 the head. Width of the head near 4 in the greatest depth; depth of the head 1.9 

 in the greatest depth; anus in front of the vertical from the anterior margin of the 

 eye; gape at least as long as the eye; teeth of both jaws large, recurved, in a single 

 series on the sides, in an irregular double series toward the front." 



From a comparison of the anal rays, the size and the shape of the head and 

 snout it seems that Sternarchorhynchus curvirostris (Boulenger) and Sternarcho- 

 rhynchus mormyrus (Steindachner) are synonymous with Sternarchorhynchus 

 oxyrhynchus (Miiller and Troschel), the variations being in part due to the size of 

 the fish. 



X. Sternarchorhamphus Eigenmann. 



Type, Sternarchus yniXlleri Steindachner. 



With fontanels; a caudal fin; snout produced, straight; mouth large; size medium 

 to large; body very elongate and much compressed; maximum depth in, or just 

 behind, the pectoral region; head moderately large to medium, pointed and pro- 

 duced; gape rather straight; small conical teeth in both jaws; eyes small and 

 covered by a membrane; scales cycloid; lateral line complete and quite straight; 

 anal long, growing narrower caudad; caudal very small. 



14. Sternarchorhamphus miilleri (Steindachner). 



Sternarchus {Rhamphosternarchus) mulleri Steindachner, Flussf. Siidam., Ill, 15, 

 pi. V, fig. 4, 1881 (Para). 



Sternarchorhynchxis mulleri Eigenmann and Eigenmann, Proc. U. S. Nat. Mus., 

 XIV, 1891, 62. 



Sternarchorhamphus mulleri Eigenmann and Ward, Proc. Wash. Acad. Sci., VII, 

 1905, 166 (Para); von Ihering, Os Peixes do Brazil, Part 1 A, 1907; Eigen- 

 mann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 449 (Para). 



