1906.1 



NATURAL SCIENCES OF PHILADELPHIA. 



463 



of small pointed palatine teeth. Tongue conic, elongate and free. 

 Interorbital space a little convex. Gill-opening forward opposite 

 front margin of eye. Rakers absent, edge of first branchial arch 

 trenchant and finely asperous, with about 21 + 37 finely asperous 

 laminse externally. FDaments | of eye. Tubes in lateral line at 

 least bifurcate. Color in alcohol brownish, greenish tints evidently 

 due to copper, and with brassy reflections. Fins unmarked, except 



^^ 



Fig. 50. — Acestrorhynchus heterolepis (Cope). 



base of caudal, which has a black spot medianly about size of pupil. 

 Iris brown. Length 14^ inches (caudal damaged). Type. 



The other examples show: Head 3^ to 3^; depth 5 to 6; D. ii, 9; 

 A. V, 23 or 24, i; scales about 120 to 130 in lateral line to base of caudal; 

 snout 1^ to 2|^ in head; eye 5^ to 5^; interorbital space 4h to 5|; least 

 depth of caudal peduncle 5^ to 5f ; length (caudal damaged) 7f to 

 lOf inches. 



Xiphostoma maoulatum Valenciennes. 



Xiphostoma toedo Cope, Proc. Acad. Nat. Sci. Phila., 1871 (1872), p. 267, PI. 

 13, fig. 2. Cotypes, Nos. 7,958 (tjTpe) and 7,959, A. N. S. P. Ambyiacu 



River. Jolin Hauxwell. Cope, Proc. Amer. Philos. Soc. Phila., 



XVII, 1877-78 (May 17, 1878), p. 688. Peruvian Amazon. Prof. J. 

 Orton 



Width of head 4f in its length; interorbital space 5J. Body well 

 compressed and edges rounded. Head broad and flattened, sides be- 

 coming constricted below. Snout depressed above, a little flattened. 

 Teeth in jaws uniform, uniserial and recurved. A rather broad finely 

 asperous tract on each palatine. Tongue triangular and not free. 

 Interorbital space broad and flat. Most osseous areas on head rugosely 

 striate. Gill-opening forward opposite anterior margin of orbit. 



