NC.1296. JAPANESE CH.ETODONTID.E— JORDAN AND FOWLER. 559 



25. ACANTHURUS UNICORNIS ( Forskal). 



TENGUHAGI (LONG NOSED SCRAPER) IKKAKCHAOI (ACUTE ANGLE 

 SCRAPER). 



Chsetodon unlcornu YoKiiKkh, Descr. Anim., 1775, p. 63; Red Sea. 

 Aspisurus unicornis B.VPVEhh, Atlas Fische, 1828, p. 60; Red Sea. 

 Naseus unicornis Gunther, Cat. Fish, III, 1861, p. 348; Frankland I., Red Sea, 



Aneitum, Ceylon. 

 3fonoceros unicornis Jordan and ^tiYDKR, Check-List, 1901, p. 91; Misaki. 

 Monoceros biaculeatus Schneider, Syst. Ichthy., 1801, p. 180, pi. xlii (after 



Forskal). . 

 Monoceros rail Schneider, Syst. Ichtli., 1801, p. 181 (after Monoceros piscis Wil- 



loughby ) . 

 Naso fronticornis L.vcei'Ede, Hist. Poiss., Ill, 1802, p. 105, pi. xii, fig. 2; lie de 



France. 

 Naseus fronticornis Cuviek and Valenciennes, Hist. Poiss., X, 1835, p. 259; He 



de France, Waigiou, Guam, Sandwich Islands, Red Sea, Otaiti. — Schlegel, 



Fauna Japonica, Poiss., 1846, p. 129, pi. xix; Nagasaki. 

 fKeris anginosus Cuvier and Valenciennes, Hist. Poiss., X, 1835, p. 304; no 



locality; D. VII, 26; A. Ill, 28; V. I, 5. 

 Niisrtis longicoriiis Cuvier, Guerin, Icon. Poiss., 1830-44, pi. xxxv, fig. 3; He de 



France. 

 Herspurus monoceros FoRSTER, Descr. Anim., Ed. Licht., 1844, p. 219. 

 Acronurus prgijptius Gronow, Syst., Ed. Gray, 1854, p. 191; Red Sea (after Has- 



selquist). 

 Acronurus corniger Gronow, Syst., Ed. Gray, 1854, p. 192; Red Sea (after 



Forskal). 



Head i; depth 2i. D. V-29; A. 11-28; P. 1-17; V. 1-3. Body 

 ovate, deep in front, compressed and fine, velvety, becoming rough in 

 front of the caudal. Head long-, the forehead with a long, produced 

 horn, directed forward from the upper part of the eye; snout long, 

 with the upper profile straight, long; eye 3 in the frontal spine, 4 in 

 snout, and 5^ in head; mouth small, the snout produced; nostrils one- 

 half an eye diameter in front of eye and about level with its middle; 

 gill-opening v^ery long, longer than the snout. Origin of the dorsal 

 over the gill-opening, behind the spines shorter than the longer ravs, 

 the edge straight and ending in a point; anal spines short, the rays 

 equal, the edge straight and ending in a point; pectorals in front of 

 the dorsal equal to the frontal spine; ventrals in front of the pectorals, 

 tlie spines sharp and thick. If in snout; caudal compressed, the margin 

 straight and the lobes produced into long filaments. Sides of caudal 

 peduncle with two large compressed l)ucklers hooked forward. Lat- 

 eral line very high and concurrent with the back. Color (dried) plain 

 brown. Here described from a large dried specimen from Nagasaki. 

 In the young, known by the number of the fin rays, the bony horn is 

 wanting, and in the very young there is no trace of caudal plates. 

 Specimens from Honolulu seem to agree perfectly with the one from 

 Nagasaki. 



This species, very abundant and widely diffused through the Indian 



