UK) FISHES. THORACICI. 20. 21. 



20. PERCA. Perch. 

 A. With 2 distinct dorsal-fins. 



72. ~P.Jluviatilis. Brownish-olive, with short dusky trail*-, 

 verse bands on the sides : dorsal-fins pale violet- 

 brown, the rest red. 



1 2. Back much raifed, curved and distorted near the tail. 

 Common Perch. r. Zool. iii t. 48. Donovan t. 52. 



Body fometimes growing to a large size, with a gilded tinge on 

 the sides, whitish towards the belly ; nostrils near the eyes, dou- 

 ble, with 4 pores before them : mouth large : jaws nearly equal t 

 teeth fmall, in the jaws and on the roof; tongue short, fmooth : first 

 dorfal-fm with 15 fpinous rays, marked with a roundish black fpot 

 accompanied with a fmaller-one ; fecond with 15 foft rays : pecto- 

 ral 14 ; ventral 8 ; anal 12 ; tail a little forked, 21 rayed. 



73. P. Lab fax. Back dusky with a blue tinge, belly sil- 

 very : second dorsal-fin with 14 rays. 



Basse. Br. Zool. iii. t. 49. Donovan's Fishes t. 43. 



Body shaped like a falmon, and growing to the weight of 15 

 pounds ; mouth large, filled with fmall teeth, with a triangular 

 rough fpace in the roof: eyes laige, reddish, iris silvery ; when 

 young the fpace above it is marked with fmall black fpots ; gill- 

 covers ending in a sharp point : dorsal-fins bro'.vn, the first g-rayed, 

 . fecond 14 ; pectoral brownish, i8-rayed ; ventral reddish-white, 

 6-rayedj tail slightly forked, brown, 2i-raycd. 



B. With a single dorsal-fin. 



74. P. cermia. Olive-brown with blackish dots : dorsal- 

 fin 27-rayecl, the first 15 of which are spinous. 



Ruffe. Donovan's Fishes t. 39. Shaw tool. iv. t. 79. 



Body about 6 inches long, slender, mucous, yellowish-olive on 

 the sides, blackish on the nape and back, whitish on the breast and 

 belly, covered with numerous dusky fpots on the body pectoral 

 Uori'al and anal fins : lateral-line a little curved : head thick, flattish t 

 eyes large, pupil blue, iris brown with a yellow mark : jaws equal c 

 Jins yellowish; dorsal sy-rayed ; pectoral 13; ventral 6j anal 7; 

 tail sharply-forked, ig-rayed. 



21. SCOMBER. MaekreL 



?5. c. SctfwJer. Blue green, with numerous transverse 

 black Hues : belly silvery : 5 spurious fins above ajid 

 below. 



Common Mackrel. Br zoo!, iii. t. 51. Shaw zool. iv. t. 34. 



Body 1-2 feet long, dark-green varied with blue and crossed with 

 black bands above the lateral-line : headlong: eyes large, covered 

 at first with a white film ;' mouth large ; the lower-jaw longer : 

 tongue loofe, pointed, fmooth : teeth in both jaws and round the 

 edge of the palate : gill-covers of 3 pieces, silvery r fcates fmall 

 oval, tranfparent : lateral-line nearer to and parallel with the bat!-, 

 with generally fome dusky fpots along it : f pur i OK s -Jins fmall, grey : 

 dorsal-fins 12, i e -rayed ; pectoral 20,; ventral 6; anal 13; tail 

 forked, ao-rayed. 



76. Sc. Colias. Varied with rich green and blue : spuri- 

 ous fins 5 both above and below. 



Coly Mackrel. Will, ichth.p. 182. Syst. Nat. p. 824. 



Found frequently in the Weirs about Swanfea, and very much 

 refembles the last, except in size which feldom exceeds 6 or 7 

 inches in length. Its colours are much vichcr, and it (iocs not ap 

 pear to come in shoals. 





