98. CH^ETODONTID^ - POMACANTHUS. 615 



tropical seas; most of them have the body crossed by transverse black 

 bars. (/"try, bristle; 3Swvj tooth.) 



C. E2aacilciBacts (Gill) J. & G. 

 Olivaceous, darker above; a dark-brown band from beginning of dor- 

 sal fin obliquely forwards through eye and across the cheeks; a second 

 bar beginning in a blotch on soft dorsal, runs vertically across the body. 

 Body suborbicular, closely compressed ; profile steep, concave, the short 

 snout projecting; mouth very small, maxillary not reaching the vertical 

 from the anterior nostril; caudal peduncle very short ; lateral line, begin- 

 ning at upper angle of opercle, running obliquely upwards to opposite 

 the base of soft dorsal and then decurved, ending opposite extremity 

 of soft dorsal. Head 2J in length; depth H. D. XII, 19; A. Ill, 17. 

 Atlantic coast, rare. 



(Sarothrodas mncnlocinctus Gill, Proc. Acai. Nat. Sci. Phila. 1831, 99.) 



329. POMACANTHUS Lacdpede. 

 (Chcptodon, Holacanthus, and Acanthochcctodon Bleeker.) 



(Lace"pede, Hist. Nat. Poiss. iv, 517, 1802: type Chwtodon arcuatus L. ) 



This genus differs from Chcctodon chiefly in the presence of a strong 

 spine at the angle of the preopercle. Body much compressed and ele- 

 vated; dorsal fin entirely scaly, with 8-15 spines; the anal with 3; 

 scales moderate or small; brauchiostegals 6 ; air-bladder with 2 poste- 

 rior horns ; pylori c cceca numerous. Species numerous in the tropical 

 seas. Many of them are brilliantly colored. (-</./., operculnm; cixnOa, 

 spine.) 



a. Dorsal spines 12 to 15. (Holacanthus* Lac.) 



9S4. P. caGaarls (Linn.) J. & G.. Angel-fish; IsabcUta. 



Brownish olive, each scale with a crescent-shaped mark of lighter ; 

 nape with a dark-brown spot ocellated with blue ; chin, base of pectoral. 

 borders and spines of opercle and preopercle bright cobalt blue ; fins 

 with blue and yellow. Body oblong, compressed and elevated; mouth 

 small; scales ciliate; soft dorsal and anal with the anterior rays pro- 

 duced in long streamers. Head 4 in length ; depth about 2. D. XIV, 

 20 ; A. Ill, 20 ; scales 8-50-30. West Indies, occasional on our South 

 Atlantic coast. 



(ChcKtmlon ciliaris Liiiii. Syst. Nut.: Holacanilius ciliaris Lace"pede, Hist. Nat. Poiss. 

 iv, 527, 16U2: Holacanthus ciliaris Giintker, ii, 46: Holacanthus ciliaris Goode, Bull. U. 

 S. Nat. Mus. v, 43.) 



*Lace~pedc, Hist. Nat. Poiss. iv, 525: type Chcetodon tricolor Bloch. (oloS, complete; 

 , spine.) 



