448 PROCEEDINGS OF THE ACADEMY OF [Oct., 



and enlarged. Mandibular teeth uniserial, except 2 simple conic ones 

 in font at symphysis forming an inner series. On each ramus of man- 

 dible 4 anterior enlarged and distinctly quindentate teeth. At base of 

 maxillary 2 small denticles. Tongue rather narrow, a little fleshy, 

 rounded and hardly free in front. Interorbital space rather broad 

 and convex. Gill-opening reaching opposite anterior margin of pupil. 

 Rakers 13 + 22, slender, fine, shorter than filaments, which are f of 

 orbit. Color in alcohol faded brownish, more or less leaden on sides, 

 and side of head and abdomen silvered. Fins pale brownish, middle 

 of caudal dusky. Lips brownish. Iris brownish. Length 2^ inches 

 (caudal damaged). 

 Chalcinus angulatus (Agassiz;. 



Chalcinus brachypomus Cope, Proc. Amer. Philos. Soc. Phila., XI, 1869-70 



(August 19, 1870), p. .566. Pebas, Eastern Peru. John Hauxwell. 



Cope, I.e. Para. De Schulte Buckow. 

 Triportheus flaims Cope, Proc. Acad. Nat. Sci. Phila., 1871 (1872), p. 264, PI. 



14, fig. 1. Cotypes, Nos. 8,077 (type) to 8,080, A. N. S. P. Ambyiacu 



River. John Hauxwell. 

 Triportheus nematurus Cope, Proc. Amer. Philos. Soc. Phila., XVII, 1877-78 



(May 17, 1878), p. 692. Peruvian Amazon. Prof. J. Orton. 



Head 3|; depth 2f ; D. ii, 9; A. iv, 27, i ; scales 34 in lateral line to base 

 of caudal, and apparently 4 more on latter; 6 scales obliquely back 

 from origin of dorsal to lateral line; 3 scales between origin of anal and 

 lateral line; 16 scales before dorsal; pectoral 2h in head and trunk; 

 mandible 3 in head, measured from tip of lower jaw; least depth of 

 caudal peduncle 3; ventral ly\; snout 4 in head, measured from tip of 

 upper jaw; eye 3|-; maxillary 3; interorbital space 3. Rakers 16 -I- 37, 

 slender, fine, more or less subequal, and longest about f of longest fil- 

 aments which are f of orbit. Lower lip with a fleshy cirrus on each 

 side about half of orbit. In alcohol brassy-brown everywhere with 

 more or less silvered reflections. Dorsal, caudal and pectoral dusted 

 with dull brownish. Iris brownish. Length 6|- inches (caudal 

 damaged). Type. 



Other examples in the collection are one from Pebas in eastern Peru, 

 John Hauxwell; one from Para in Brazil, De Schulte Buckow; one 

 identified as Triportheus nematurus from the Peruvian Amazon, Prof. 

 James Orton, in the collection of 1873. 



All the examples now before me show the following extent of var- 

 iation: Head 3f to 4J; depth 2^ to 3i; D. ii or in, 8 to 10, usually 9, 

 though sometimes 9 or 10; A. in or iv, 25, i to 29, i, usually 27, i, some- 

 times 26, I or 28, i, and rarely 25, i or 29, i ; scales 30 to 34 in lateral 

 line to base of caudal, usually 3 or 4 on latter; 6 or 7 scales obliquely 

 back from origin of dorsal to lateral line, usually 6; 3 or 4 scales between 



