147 



height of fifth dorsal spine equals its distance from base of 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 tail 

 with two moderately -strong spines on either side. Colour 

 greyish, with numerous short blue transverse spots or lines in the 

 posterior half of the body. Caudal with a light edge. 



Bab. Ked Sea, seas of India, Malay Archipelago, and Polynesia. 



907. (3.) Naseus unicomis. 



Chsetodon unicornis, Forsk. Descr. Anim. p. 63, and Icones, t. xxiii. 

 Naseus unicornis, Day, Fish. India, p. 209 (see synon.). 



B. iv. D. 5-6/27-28. P. 17. A. 2/26-28. C. 16. 



Length of head 4| to 4|, height of body 2|- in the total length. 

 Eyes diameter 4 to 5| in length of head, 3| to 4 diam. from end 

 of snout, and 1| apart. Forehead with a long projecting- horn on 

 a level with the middle or upper edge of the eye, and increasing in 

 length with age ; in a fish 10 inches long it is | inch, in another 

 of 14 inches it is 1 inch, whilst in a third a little over 20 inches 

 long it is 3g. Teeth- rather compressed, pointed, with smooth 

 edges, and about 15 on either side of both jaws. Fins length of 

 5th dorsal spine equals its distance from first spine and is | higher 

 than the rays. Pectoral f as long as head. Anal rays not quite 

 so high as those of soft dorsal. Caudal slightly emarginate. Free 

 portion of tail with two strong lancet-shaped spines on either side. 

 Colour greyish above, becoming tinged with yellow on the abdo- 

 men ; dorsal and anal fins with longitudinal orange stripes and a 

 blue outer edge ; tail yellowish. 



Hob. Eed Sea, east coast of Africa, seas of India to Polynesia. 



Family XVII. CABANGIME. 



Scomberoidei, pt., et Sqttamipinnes, pt., Cuv. : Scombrisidce, pt., 

 Richardson. 



Body oblong, elevated, or subcylindrical and compressed. Gill- 

 openings wide. Eyes lateral. Infraorbital bones do not articulate 

 with the preopercle. Dentition varied. The spinous portion of 

 the dorsal fin is shorter than the soft, and is sometimes formed by 

 isolated spines ; the posterior portion both of the dorsal and anal 

 sometimes consists of detached finlets ; the soft dorsal and the 

 anal of nearly equal extent. Ventrals, when present, thoracic, 

 sometimes rudimentary. Scales usually small, unless absent. 

 Lateral line wholly, partially, or not at all armed with shield-like 

 plates. Air-bladder present. Pyloric appendages usually in large 

 numbers. Vertebra; 10/14 (Naucrates 10/16). 



