106 PISCES. 



We now pass to Percoides with seven branchial rays, and a 

 single dorsal, the teeth small and crowded. 



AcERiNA, Cuv. 



Cavities or depressions on the bones of the head; preoperculum 

 and operculum with small spines, but not dentated. Two fresh-water 

 species are found in Europe. 



A. cernna; Ferca cernua, h.; Perche goujonniere; Bl. 53,2; 

 Cuv. et Val. Ill, pi. xli. 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 SchroRtz; Bl. 332. 

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

 bits the Danube.(l) 



Rypticus, Cuv. 



Small spines on the opercula; the scales, like those of the Gram- 

 mistes, small and concealed in a thick epidermis; particularly dis- 

 tinguished from the Grammistes by the single dorsal. 



R. saponaceiis; Anthias saponaceus, Bl., Schn. ; Parra, xxiv, 2. 

 An American species which has received this name on account 

 of its soft skin, that is smeared with a frothy viscosity. (2) 



POLYPRION, Cuv. 



This genus, in addition to dentations in the preoperculum and 

 spines, or the operculum, is marked by a bifurcated and very rough 

 crest on the latter; the bones of the head are generally covered with 

 asperities. 



nella, Cuv., the figure of which was taken by Blochfrom Plumier, and, with some 

 alteration given as the Sparus erythrinus, pi. 274::,— Bod. aia, BL, 227, or Jcara 

 aia, Margr., 167; — Mes. chrysurus, Cuv. et Val., II, xl, which is also the Sparus 

 chrysurus, Bl., 262, or Acara pitamba of Marcgr., 155; the Anthias rahirruUa, Bl., 

 Schn., Parra, XXII, l;the Spare demi-luney Lacep. IV, iii, 1; and the Colas oi 

 Guadeloupe, Duham. Sect. IV, pi. xii, 1; — M. cynodm, Cuv. or Antkias cabalk- 

 rote, Bl., Schn., Parra, XXV, 1;—Anth. Jocu, Bl., Schn., Parra, XXV, ^^—Sp. 

 tetracanthus, BL, 2"9, which is also the Vivanet gris, Lacep., IV, iv, 3; and the 

 Lutjanus acuiirostris, Desmar.; — M. sillao, Russel, 100; — M. lunulatus, Cuv., 

 Mungo Park, Lin. Trans., HI, xxxv, 6;—Lutj. eryihropterus, Bl. 249;— Ltiij. lut- 

 janus, Id., 245; — Spants malabaricus, Bl., Schn.; — M. rangus, Cuv., Russel, 

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

 species described in our second volume. 



(1) Add Perca acerina, Guldenst., Nov. Comment. Petrop., XIX, 455. 



(2) Add Bypticus arenatus, Cuv. et Val., Ill, pi. xlvi. 



