. Catalogue of the fishes in the ... Museum. 59. ARius. 149 of the head (its own length included), and twice and a half as broad as long. The basal bone of the dorsal spine is quadrangular, slightly narrowed in the middle. (VaL) Surinam; Porto llico. 17. Arius passany. Bagrus passany, Cuv. Sf Veil. xiv. p. 458. D. 1/7. A. 17. Similar to A. proojjs. The eye is close to the end of the snout and remote from the prae- opercular limb; the lower jaw is the longer. Teeth on the palate and barbels similar to those in A. proops; occipital process shorter than in that species; basal bone of the dorsal s
. Catalogue of the fishes in the ... Museum. 59. ARius. 149 of the head (its own length included), and twice and a half as broad as long. The basal bone of the dorsal spine is quadrangular, slightly narrowed in the middle. (VaL) Surinam; Porto llico. 17. Arius passany. Bagrus passany, Cuv. Sf Veil. xiv. p. 458. D. 1/7. A. 17. Similar to A. proojjs. The eye is close to the end of the snout and remote from the prae- opercular limb; the lower jaw is the longer. Teeth on the palate and barbels similar to those in A. proops; occipital process shorter than in that species; basal bone of the dorsal spine subcrescentic. Ventrals longer than pectorals. ( Val.) Cayenne. 18. Arius caerulescens. D. 1/7. A. 17. P. 1/10. The height of the body is contained about five times in the total length (without caudal), the length of the head thrice and a half or thrice and two-thirds ; head much broader than high, its greatest width being three-foiu'ths of its length. Eyes rather small, their diameter being one-half of the extent of the snout, two-sevenths of their distance from the gill-opening, and one-third of the width of the Lnterorbital space. The teeth on the palate form a slightly cuiwed band, composed of two vomerine patches which are much broader than long, and of a pair of palatine patches Avhich are subcontinuous with, scarcely broader and longer than, those of the vomer. The bar- bels of the maxiUaries extend to the middle, the outer ones of the mandible to the base of the pectoral. Crown of the head granular; occipital process broader than long, subtri- angular, subtruncated behind, and slightly raised along the median line ; the basal bone of the dorsal spine is subtriangular, small. Dorsal spine of moderate strength, more than half as long as the head, granulated in front and slightly serrated behind; the first soft ray is as high as the body. Adipose fin shorter than the dorsal. Caudal deeply forked, with the upper lobe longest, its length being nearly —- equal to that
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