68 
PISCES THORACICI. CILTTODON. 
teeth as described before; the lips thin, the tongue retracted, the palate smooth. The eyes lower, round, large. 
Nostrils double. The branchial membrane exposed ; the aperture large. 
The pectoral fin low, and in proportion long; the caudal a little more divided, than in the last, and the 
lobes sharper. 
The colour a grayish pearl, with sky-blue bands on the sides, and a pale yellow, large, spot, between each 
band. The belly a dull white. The dorsal and anal fins have a bluish cast; the others a yellowish white. 
The length, including the tail, six inches. 
No. LXXXVII. 
C mastodon cauda Integra, medio parum productiore ; spinis dorsalibns quatuor; pinna dor si 
analisque sicut alee extensis; pinnis ventralibus longissimis, falcatis. 
The ChjETodon with an undivided tail, projecting somewhat in the middle ; four dorsal 
spines; the dorsal and anal fins extended like wings; and the ventral extremely long 
and falcate. 
Chatodon Teira , Forskal. Descr. Anim. JVo. 82. 
Called by the Natives Kahi Sandawa. 
4 1 3 
B. iv. D. 35. P. 17. V. 6. A. 24. C. 18. 
The body. This species in its form differs from the others, it is transverse-oval, and the dorsal and anal fins 
have the appearance of wings extended. It is much compressed, covered with very minute scales, and is 
rough to the touch. 
The head low, small, compressed, and, the crown and cheeks excepted, without scales. The rostrum short, 
blunt. The mouth small; lips thin: jaws nearly of equal length; teeth setaceous; the tongue and palate 
smooth. The eyes high, nearer the opercula than the rostrum, small, round, iris yellow. The nostrils stand 
obliquely, half way between the orbit and rostrum, the posterior oval, the other smaller, round. The 
posterior opercula acuminate, and lower part squamous. The branchial membrane partly exposed. 
The trunk. The back thin, rapidly assurgent to the dorsal spines, then arched; the arch on the opposite 
side (the belly being hardly convex) less complete. The lateral line forms a low arch, and after waving a 
little terminates at the middle of the caudal fin. The anus is nearer to the gills than to the tail. 
The Jins. The dorsal and anal remaining expanded after death, forms something of a crescent, with the 
expanded tail projecting from the middle, but the upper limb is the longest; the dorsal ray longest measuring 
about five inches, and the anal four; the pectoral low, short, acuminate; the ventral falcate, ending in a 
setaceous tail, nearly four inches in length; the caudal fin intire, yet not truncate, the exterior rays, and two 
or three in the middle, being a little longer than the rest. 
The colour, of the head, breast, and trunk, a dark gray; but a band of a still darker colour, crosses the face, 
and eyes, from the back to the gills, and another twice as broad crosses the body and pectoral fin: the hinder 
part of the fish is nearly the same colour as the band, with a tint of dark purple. The fins almost black. 
* Inches. Lines. 
The length, from the rostrum to the caudal fin, - - - - 4 5 
of the caudal fin - -- -- -- - -1 2 
Greatest breadth - -- -- -- -- -- -- 4 5 
The colour in another subject, almost twice as big as the one now described, was more uniformly of a 
purplish black; and the bands were hardly discernible. 
