FAMILY, XV— ACAXTHURID^I. 200 



2. Naseus brevirostris, Plate XL VIII, fig. 4. 



Cuv. and Val. x, p. 277, pi. 291; Bleeker, Celebes, iv, p. 165, and Celebes, viii, p. 306; Giinther, Catal. 

 iii, p. 349 ; Klunz. Verb. z. b. Ges. Wien, 1871, p. 71. 

 Naseus Hoedtii, Bleeker, Amboina, iv, p. 339. 



B. v, D. ^! w , P. 16, V. 1/3, A. ^ TO , C. 16. 



Length of bead 4j, of caudal 5f to one-sixtb, beigbt of body 2§ in the total length. Eyes — diameter 3f in 

 • the length of head, 2 J diameters from the end of snout, and lj apart. Profile from the snout to above the orbits 

 very abrupt, with a large horizontal horn in front of the eyes, varying in size with age. Teeth — small, about 

 40 in either jaw, and finely serrated. Fins — the height of the fifth dorsal spine equals its distance from the 

 base of the first, the spines not quite so high as the rays. Anal rays not so high as those of the soft dorsal. 

 Caudal emarginate. Free portion of the tail with two moderately strong spines on either side. Colours — 

 grayish, with numerous short blue transverse spots or lines in the last half of the body. Caudal with a light 

 edge. 



Habitat. — Seas of India to the Malay Archipelago and Polynesia. 



3. Naseus unicornis. 



Monoceros piscis et minor, Willughby, pp. 150, 216, t. O. 4. 



Chatodon unicornis, Forsk. p. 63, and Icones, t. xxiii; Gmel. Linn, i, p. 1268. 



Monoceros raii et biaculeatus, Bl. Schn. pp. 180, 181, t. xlii. 



Naso fronticornis, Lacep. iii, pp. 105, 106, t. vii, f. 2. 



Acanthurus unicornis, Shaw, Zool. iv, p. 374, pi. 50. 



Aspisurus unicornis, Riipp. Atl. Fische, p. 60. 



Naseus fronticornis (Comm.) Cuv. and Val. x, p. 259 ; Temm. and Schleg. Fauna Japon. Poiss. p. 129, 

 t. lxix ; Richards. Ich. China, p. 244 ; Bleeker, Batoe, iii, p. 238, and Waigou, 1868, p. 3 ; Cuv. Reg. Arum. HI. 

 Poiss. pi. 72, f. 2. 



Naseus longicornis, Cuv. in Guer. Icon. Poiss. pi. 35, f. 3; Griffith in Cuv. Anim. King. Fishes, pi. 33, f. 3. 



Naseus olivaceus, (Solander) Cuv. and Val. x, p. 288 (young). 



Marpurus monoceros, Forst. Desc. Anim. ed. Licht. p. 219. 



Acronurus JEqyptins, Gronov. ed. Gray, p. 191. 



Acronurus criniger, Gronov. ed. Gray, p. 192. 



Naseus unicornis, Giinther, Catal. iii, p. 348 ; Klunz. Verh. z. b. Ges. Wien, 1871, p. 72. 



B. iv, D. ^fe P. 17, V. 1/3, A. w ?^, C. 16. 



Length of head 4J to 4i, of caudal 5§, height of body 2| in the total length. Eyes — diameter one-fourth 

 to 5| in the length of head, 3j to 4 diameters from the end of snout, and 1 J apart. Forehead with a long horn- 

 like production on a level with the middle or upper edge of the eye, and increasing in length with age : in one 

 10 inches long it is 1/2 an inch, another at 14 inches it is 1 inch, whilst in a third a little over 20 inches it is 3|. 

 Teeth — rather compressed, pointed, with smooth edges, and about 15 on either side of both jaws. Fins — fifth 

 dorsal spine equals its length from the base of the first spine and 1/4 higher than the rays. Pectoral 2/3 as 

 long as the head. Anal rays not quite so high as those of the soft dorsal. Caudal slightly emarginate. Free 

 portion of the tail with two strong lancet-shaped spines on either side. Colours — grayish superiorly, becoming 

 tinged with yellow on the abdomen : dorsal and anal fins with longitudinal orange stripes and a blue outer edge : 

 tail yellowish. 



Habitat. — Red Sea, East coast of Africa, seas of India to Polynesia. 



2 E 



