92 FISHES. 



We now pass to the Perches with seven hrancliial rays, and a single 

 dorsal, which have the teeth dense as the pile on velvet. 



ACERINA, CuV. 



The Gremilles are characterized by cavities or depressions on the bones 



of the head, and by their preoperculum and operculum having only small 



spines, but not dentated. Two fresh-water species are found in Europe : 



j4. cermia; Perca cernua, L. ; Perche (joujonnicre, Bl. 53, 2; 



Cuv. et Val, III, pi. xli. (The Common Gremille). A small fish 



of an agreeable flavour, very common in all the fresh-water streams 



of Europe ; it is of an olive colour, spotted with brown. 



A. schraitzer; Perca schraitzer, L. ; the Schrcetz, Bl. 332. 

 Larger, and has interrupted blackish lines on the sides: it inhabits 

 the Danube*. 



Rypticus, Cuv. 



The Savonniers, or Soap-worts, also have only small spines on the 

 opercular pieces; the scales, like those of the Gramraistes, are small, 

 and concealed in a thick epidermis; particularly distinguished from the 

 Grammistes by the single dorsal. There is one of these in America of a 

 violet black, Anthias saponaceus, Bloch., Schn., Parra, xxiv, 2, (The Sa- 

 ponaceous Anthias), which owes its name to its soft skin and the layer upon 

 it of a frothy viscosity f. 



PoLYPRION, Cuv. 



The Cerniers have not only dentations on the preoperculum and spines, 

 or the operculum, but there is on this last bone a bifurcated and very rough 

 crest, and the bones of the head are generally covered with asperities. 



The Mediterranean possesses a species wliich becomes enormous, 

 Polyp, cernium, Valenc. ; Mem. du Mus. tom. XI, p. 265 ; and 

 Cuv. and Val. Ill, pi. xlii;};. It is clouded with brown on a lighter 

 ground. 



Centropristis, Cuv., 



Possess all the characters of the Serrans, except that they want the 

 canines, and that all the teeth are small and dense as the pile on velvet ; 

 preoperculum dentated and operculum spinous. 



Centrop. nigricans, Cuv.; Coryphcena nigrescens, BL, Schn.; 



tamba o{ Marcgr. 155;— the ^n^ftias rabirruhia, Bl., Schn., Parra, XXII, 1 ;— the 

 Spare demi-lune, Lacep. IV, iii, 1; and the Cdas of Guadeloupe, Duham. Sect. IV, 



pl_ xii, 1 ; M. cyuodon, Cuv., or Anthias caballerote, Bl., Sclin., Parra, XXV, 1 ; — Anth. 



jocu, B\.', Schn., Parra, XXV, 2; — Sp. tetracanthus, Bl. 279, which is also the Vivanet 

 ffris,' Lacep. IV, iv, 3; and the Lu/janus acutiroslris, Desmar.; — M. sillao, Russel, 



1 00; M. lunulatus, Cuv., Mungo Park, Lin. Trans. Ill, xxxv, 6 ; — Lutj. erylhropterus, 



21249; Luij. lutjanits, Id. 245; — Sparus malabaricus, BL, Schn.; — M. rangus, Cuv., 



Russel,' 94; — M. rapilli, Id. 95; — Alphesles gembra, Bl.,Schn., pi. 51, 2, and the other 

 species described in our second volume of the History of Fishes. 



* Add, Perca acerina, Guldenst, Nov. Comment. Petrop. XIX, 455. 



t Add, Rijpticus arenatus, Cuv. et Val. Ill, pi. xlvi. 



+ The Amphiprion australis, Bl. Schn. pi. 47, or americamis, lb. p. 205 ; and the 

 Amph. oxytieneios, lb., or Perca progmUhus, Forst., do not appear to us to be distin- 

 guishable from tlie cernium. 



