. Catalogue of the fishes in the ... Museum. 59. ARius. 171 ^. American species. 59. Arius nuchalis. D. 1/7. A. 21. P. 1/10. The height of the body is one-fifth of the total length (without caudal), the length of the head one-fourth. Head as broad as high, its greatest width being two-thirds of its length ; its ^ ^ upper surface is granulated: the occipital process is triangular, as long as broad, with the lateral margins slightly concave; it is elevated into an obtuse ridge running along the middle; the longitudinal groove in the middle of the forehead is rather wide, narrow behind, and does
. Catalogue of the fishes in the ... Museum. 59. ARius. 171 ^. American species. 59. Arius nuchalis. D. 1/7. A. 21. P. 1/10. The height of the body is one-fifth of the total length (without caudal), the length of the head one-fourth. Head as broad as high, its greatest width being two-thirds of its length ; its ^ ^ upper surface is granulated: the occipital process is triangular, as long as broad, with the lateral margins slightly concave; it is elevated into an obtuse ridge running along the middle; the longitudinal groove in the middle of the forehead is rather wide, narrow behind, and does not extend to the base of the occi- pital process. The teeth on the palate are coarsely granular, and form two subtriangular patches of moderate extent, which, sometimes, are subcontinuous with their anterior angles. The maxillary barbels extend nearly to the end of the pectoral. Dorsal spine of moderate strength, slightly serrated along both edges, five-sixths of the length of the head. Adipose fin small, shorter than the dorsal. Pectoral spine as long as, but stronger than, that of .the dorsal. Pectoral fin shorter than the head. British Guiana. a-c. Six inches long. Purchased of Mr. Scrivener, d-f. Young. Presented by Sir R. Schomburgk. 60. Arias laticeps. D. 1/7. A. 22. The height of the body is contained four times and two-thirds in the total length (without caudal), the length of the head four times. Head broader than high, its greatest width being three-fourths of its length ; its upper surface is granulated: the occipital process is triangular, as long as broad, with concave lateral margins; its median ridge is scarcely elevated; the longitudinal groove in the middle of the forehead is narrow, tapering behind, and docs not extend backwards to the base of the occipital process. The teeth on the _ palate are granular, and form two small, ^â¢^â ^â -^ separate patches anteriorly on the palate. The maxillary /? *^ barbels extend to the middle of the pectoral. Dor
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Keywords: ., bookauthorgntheral, bookcentury1800, bookdecade1860, bookyear1864
