272 FISHES OF WESTERN SOUTH AMERICA 
353. CYNODON GIBBUM Spix 
Cynodon gibbus Spix, 1829, Sel. Gen. et Spec. Pisce. Bras., 76; 
Cuvier and Valenciennes, 1848, Hist. Nat. Poiss., X XII, 333, Amazon; 
Castelnau, 1855, Anim. Amér. Sud, Poiss., 75, Amazon; 
Giinther, 1864, Cat. Fish. Brit. Mus., V, 359; 
Steindachner, 1882 (1883), Denksch. KIX. Akad. Wiss. Wien, XLVI, 15, Rio Huallaga, three 
specimens } 
Eigenmann and Higenmann, 1891, Proc. U.S. Nat. Mus., XIV, 59; 
Fowler, 1906 (1907), Proe. Acad. Nat. Sei. Phila., LVIII, 467, pl. xxvu; 
EKigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, II, 444; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 395. 
Fra. 30. The lower Huallaga river and navigation by raft constructed of balsa-wood. 
Raphiodon gibbus Cope, 1878, Proe. Amer. Phil. Soc., XVI, 688, Peruvian Amazon, two, Orton 
collection. 
Amazon to Rio Mamoré 
15734, 6, 152-230 mm., Lago Sanango, Yurimaguas, Allen, November, 1920. 
The popular name dentén (long-tooth) is reported by Steindachner. I found 
the name peje-perro (dog-fish) commonly current. 
Genus 140: HYDROLICUS Miller and Troschel 
Hydrolicus Miller and Troschel, 1844, Arch. Naturg., 93; 
Miller and Troschel, 1845, Horae Ichth., I, 18; 
