OCR Text |
Show 1887.] BY MR. C. BUCKLEY IN EASTERN ECUADOR. 281 The height of the body is considerably less than the length of the head, and is one fifth of the total (without caudal) ; the length of the head is contained about four times and one fourth in the total (without caudal). Lower jaw obtuse, projecting beyond the upper ; the inner borders of the mandibles closely approximate anteriorly, diverging posteriorly, the part of the chin exposed between them being ^-shaped, as in P. unitceniata1. The maxillary extends beyond the anterior margin of the orbit. The diameter of the eye is nearly half the width of the interorbital space, a little less than the extent of the snout, and one fifth of the length of the head. The origin of the dorsal fin is nearer to the root of the caudal than to the end of the snout, and behind the vertical from the base of the ventral. Adipose fin very small ; caudal forked, with its basal half scaly. The length of the pectoral is two thirds of that of the head, and exactly one half of its distance from the ventral. Ventral shorter than pectoral. Pale brown above, yellowish inferiorly ; a black lateral band becoming greyish and rather indistinct in the adult; a black spot on the base of the anterior dorsal rays, another on the root of the caudal fin. Total length 145 millim. Two adult specimens from Canelos, and three young from Sarayacu. 24. TETRAGONOPTERUS RUTILUS, Jen. Tetragonopterus fasciatus, Gthr. Canelos. 25. CREAGRUTUS MUELLERI, Gthr. Canelos. 26. PARAGONIATES ALBURNUS, Stdr. Paragoniutes alburnus, Steind. Sitzungsb. Ak. Wien, lxxiv. i. 1876, p. 117, pl. viii. fig. 3. Canelos. L E P T A G O N I A T E S , g. n. Body elongate, very strongly compressed. Dorsal fin short, placed behind the middle of the length of the body, far behind the ventrals ; anal very long, nearly two thirds the length of the body. Cleft of the mouth narrow ; prsemaxillary, maxillary, and mandible with a single series of tricuspid teeth. Gill-openings wide. Scales moderate. Lateral line complete. The nearest ally of this new genus is Paragoniates, Steind., which differs in the following points :-Cleft of the mouth wide; anal originating very slightly in advance of the dorsal; lateral line interrupted. 1 In P. erythrinoides, C. & V., the inner borders of the mandibles are widely separated in front and nearly parallel. |