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Show 246 DR. A. GUNTHER ON NEW AMERICAN FISHES. [Mar. 26, root of the ventrals. Caudal fin slightly forked. Scales slightly striated at the base, the lateral line being visible on the eight anterior scales. Uniform olive-coloured; the middle caudal rays black. Three examples, 2| inches long, were collected by Mr. Bartlett on the Huallaga and at Xeberos. ANACYRTUS AFFINIS. D. 11. A. 55. L. lat. 80. Upper a.id lower jaws on each side with a pair of short conical tooth-like processes directed forwards and outwards. Intermaxillary teeth in two irregular series, those of the mandible being in a single series, two pairs of them larger than the rest, canine-like. Maxillary with four or five distant short conical teeth. Back much elevated, the profile on the nape being deeply concave. The height of the body is contained twice and two-thirds in the total length (without caudal), the length of the head four times. Lower jaw considerably shorter than the upper; maxillary not extending to the vertical from the front margin of the eye. Suborbital touching the lower prseopercular limb, sliglitly and irregularly striated. The diameter of the eye is equal to the width of the interorbital space, or to the length of the snout, and two-sevenths of that of the head ; it is placed immediately below the upper profile. The humeral process in front of the pectoral terminates in an obtuse point behind, without projection in front. Origin of the dorsal fin opposite to that of the anal, rather nearer to the eud of the snout than to the root of the caudal. Pectoral extending beyond the vent, ventral beyond the origin of the anal. Caudal forked. Humeral and caudal spots more or less indistinct; a narrow silvery band along and above the lateral line. Two examples, 4 inches long, were collected by Mr. Bartlett on the Huallaga. ANAC\RTUS (CYNOPOTAMUS) AMAZONUM. D. 11. A. 40. V. 8-9. L. lat. 110. The height of the body is contained twice and two-thirds in the total length (without caudal), the length of the head thrice and three-fourths. Upper profile deeply concave on the nape, the back being much elevated. Abdomen not compressed, but with a median ridge from behind the ventrals. The intermaxillary teeth are of three sizes, viz.:-1, a pair of large canine teeth in front of the jaw, standing close together, and a second similar tooth close to the end of each bone; 2, a series of small teeth between the canines mentioned ; 3, two smaller canines in a separate series inwards of the small teeth. The maxillary is armed with a series of very small teeth in its entire length. The teeth in the mandible are similar to those of the intermaxillary, but rather stronger, and form a single series; they stand in the following order: - (first) two small teeth, (secondly) a canine corresponding to the upper front canine, |