1870.] ^6^ ■ [Cope. 



Color pale, with a silver lateral band, and black hnmeral and basal 

 caudal spot. 



Pebas. Eastern Equador, Hauxwell s Collection. 



This species is near the R. myersii Gill, M.S., but is a shallower 

 fish, with smaller eye, and fewer horns on the upper jaw. The Hystri- 

 codon xenodon Reinhardt, Vidensk. Med. Kjobenhavn, 1849 37, has much 

 larger scales. 



Anacyrtus tectifer. Cope sp. nov. 



Radii ; D. 11 ; A. 37. Scales from basis of dorsal to basis of anal 13 — 1 0. 

 A short, deep species ; depth 3.2 times in length, without caudal fin ; head 

 3.6 in the same; eye 3.75 times in length of head; equal interorbital 

 width ; head elevated, front slightly concave in profile, end of muzzle 

 descending ; scales rather large ; ventrals reaching anal fin, pectorals not 

 Maxillary teeth numerous, equal, premaxillary series confluent, three 

 canines on each side ; mandible with two on each side ; mandible longer 

 than muzzle, when open. 



White, without silvery lateral band ; inferior half operculum golden ; a 

 large black spot in front of the origin of the dorsal, on the side : a black 

 spot at the basis of caudal ; ante-orbital region punctulate ; length 

 O.M. 068 ; to end of maxillary .0075 M. to origin of ventral fins .0225 M. ; 

 to origin of anal .031 M. The origin of the dorsal is in advance of the 

 line of the origin of the anal. Its last ray is much behind the latter 

 point. 



This species is named from the fact that the free anterior margin of 

 the nasal bones is more prolonged than in other species, and overhangs 

 the nares and premaxillaries. The few anal radii and coloration also 

 distinguish this fish from its allies. 



Pebas, Ecuador. Hauxwell's Collection. 



Ctnopotamus gulo. Cope sp. nov. 



Form slender ; the depth of the body near three-fourths the length of 

 the head, four and one-third times in the total, without caudal fin. 

 Length of head three and a quarter times in the same. Eye 3.75 times 

 in the length of the head. Maxillary bone extending a little beyond the 

 line of the posterior rim of the orbit. Fourteen rows of scales between 

 origin of dorsal and lateral line. Fin radii D. 12, A. 41. The profile of 

 the head is scarcely concave and slopes regularly to the premaxillary 

 border. A few scattered canines form an inner premaxillary row. 

 There is a canine at each end of each premaxillary of the outer row. 

 The outep mandibular row consists of four equidistant canines on each 

 side in front, and numerous small teeth behind. 



Color pale. Lower half the opercle golden. A black humeral spot, 

 and a silver lateral band extending from it to the caudal fin, at the base 

 of which is a black spot. 



Length OM .09. To opercular margin .025. To origin doi'sal (vertical 

 line) .035. To origin of anal .044. 



