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Show 1868.] DR. A. GUNTHER ON NEW AMERICAN FISHES. 233 bristles; interoperculum with a bundle of about twenty setiform spines, the longest of which are about one-fourth of the length of tne head, and extend backwards to the root of the pectoral fin. moras.and belly entirely naked. Dorsal fin rather higher than long the length of its anterior rays being three-fourths of that of the head ; the length of Its base equals its distance from the root of the caudal. There are six scutes between the two dorsal fins. Caudal fin forked, the lower lobe being the more developed. The pectoral spine extends to the second third of the ventral; the ventral fin to the middle of the anal. Twelve scutes between the anal and caudal fins. Scutes of the body without keels, but with vertical series of spines, the anterior scutes with one series only, the middle with two, and the posterior with three or more. Posthumeral ridge indistinct. Blackish brown; head and body with numerous indistinct round yellowish spots, each about as large as the pupil; each dorsal ray with a series of round whitish spots, the black ground-colour forming a network on the fin. One male specimen, 6 inches long, has been obtained from the collection of Dr. van Lidth de Jeude. It is probably from Surinam. CHAETOSTOMUS DENTEX. D. 1/7. A. 4. P. 1/6. L. lat. 23. Head depressed, rather longer than broad, its length being somewhat more than one-third of the total (without caudal). A very distinct short ridge runs from the upper angle of the orbit to below the nostril. Interorbital space and occiput flat, the orbital margin being slightly elevated. Eye rather small, its horizontal diameter being one-half of the width of the interorbital space. Margin of the snout rough, like the surface of the head, but without bristles. Lnteroperculum with a bundle of about ten straight setiform spines, the longest of which is as long as the eye. Thorax and belly nearly entirely naked, there being only a few granulations behind the throat. Teeth comparatively large, with the apex dilated, scarcely lobed; there are about six on each side in the upper jaw, and three in the lower. Dorsal fin higher than long, but its anterior ray is shorter than the head ; the length of its base is less than its distance from the caudal; there are seven scutes between the two dorsal fins. Caudal fin forked, the lower lobe being much longer than the upper. The pectoral spine extends to the second fourth of the ventral; the ventral fin beyond the anal. Eleven scutes between the anal and caudal. Scutes not keeled, but covered with strong spines. Uniform greyish brown. One example, 3| inches long, was found by Mr. Bartlett at Xeberos. ACANTHICUS HYSTRIX, Spix. The figure given by Spix is not good; but the species may be readily recognized from it. Mr. Bartlett obtained a splendid ex- |
