. Bulletin - United States National Museum. Science. FISHES OF THE PHHjIPPINE AND ADJACENT SEAS 281 Body minutely asperous, velvety to touch; young with larger asper- ities, velvety. D. VI, 27, I or 28, i, first spine 1^ to 2 in head, first ray 1^^ to 2}i; A. II, 27, I to 29, i, second spine 3 to 3%, first ray 2^4 to 3^; caudal moderately emarginate, becomes slightly lunate with age, old examples with hind edge nearly truncate, 3^ to 3% in combined head and body, to tip of upper lobe Ito to 13/^ in head; least depth of caudal peduncle 4 to 6^; pectoral IK to IH; ventral 13^ to 2}4; caudal pedu
. Bulletin - United States National Museum. Science. FISHES OF THE PHHjIPPINE AND ADJACENT SEAS 281 Body minutely asperous, velvety to touch; young with larger asper- ities, velvety. D. VI, 27, I or 28, i, first spine 1^ to 2 in head, first ray 1^^ to 2}i; A. II, 27, I to 29, i, second spine 3 to 3%, first ray 2^4 to 3^; caudal moderately emarginate, becomes slightly lunate with age, old examples with hind edge nearly truncate, 3^ to 3% in combined head and body, to tip of upper lobe Ito to 13/^ in head; least depth of caudal peduncle 4 to 6^; pectoral IK to IH; ventral 13^ to 2}4; caudal peduncle with 2 bucklers, each with compressed denticle and though posterior denticle better developed anterior with longer base or 1 to 1% in eye; young without Fig. 21.—Rostral variation with age of Naso hexacanthus (Bleeker) Dull brown, slightly paler below sometimes, mostly uniform. Iris brown. Dorsals deep brown to dusky or even blackish brown; smaller examples with soft dorsal having 4 longitudinal blackish bands, fins with age clouded to uniformly dark brown. Anals uniform dusky and edges like dorsals, dark. Caudal and paired fins brown. Under the microscope the young show the teeth serrate. In the adult they are inconspicuous, though present and much less devel- oped. In this connection we have carefully compared the type of Callicanthus metoposophron in the National Museum and feel certain it is the younger stage of the present species. The teeth show dis- tinct, though weak serrations, as in all our other Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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