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Show 68 ON FISHES FROM RIO JANEIRO. [May 12, in the jaws being large and pointed, and the palatines having a single series of strong teeth. The scales are small, regularly arranged, deciduous; all the species have a strong opercular spine, and in none is a spine on the snout developed. GENYPTERUS BRASILIENSIS, sp. n. (Plate VIII. fig. 2.) Depth of body about 7 times in total length, length of head about 4| times. Snout a little longer than eye, the diameter of which is 5-6 times in the length of head, interorbital width about 7 times. Lower jaw shorter than upper; maxillary extending beyond posterior margin of eye, the width of its distal extremity equal to diameter of eye. Scales on upper surface of head extending as far as posterior margin of eye; cheeks and opercles scaly; interorbital space, snout, and jaws naked; 15-18 rows of scales between anterior dorsal rays and lateral line. About 8 gill-rakers on lower part of anterior arch, the upper of moderate length, graduating to rudiments below. Dorsal beginning above posterior third of pectoral when laid back; pectoral 3 times in length of head, posterior ray of ventral twice. Greyish above, silvery below. Description based on five examples from Rio Janeiro, the largest 440 m m . in total length. Apparently no species of this genus has hitherto been described from the Atlantic coast of America. . In all other species the dorsal commences above the middle of the pectoral when laid back. PLEURONECTILME. SOLEA FONSECENCIS Giinther. The occurrence of this species at Rio Janeiro is interesting, as it has been previously recorded only from the Pacific coast of Mexico and Central America. I have carefully compared the single example in Dr. Goeldi's collection with others from the Gulf of Fonseca and the Rio Presidio, and am unable to detect the least difference between them. LOPHIIBVE. L O P H I U S PISCATORIUS Linn. A small specimen from Rio Janeiro is exactly similar to others of this species from both sides of the North Atlantic. EXPLANATION OF THE PLATES. PLATE VII. Mylacrodon goeldi (Xf), p. 63. PLATE VIII. Fig. 1. Peristedion altipinnis (xf), p. 65. 2. Genypterus brasiliensis (x|), p. 68. I |