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. cernua; Perca cernua, L. ; 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. 



^. schraitzer; Perca schraitzer, L. ; the Schrmtz; 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. 



B. saponaceusi 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 wliicli was taken by Kloch from Plumler, and, with some 

 alteration given as the Sparus erythrinus, pi. 274; Bod. aia, Bl., 227, or Acara 

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

 ehrysurus, Bl., 262, or Acara pitamba of Marcgr., 155; the Anthias rabirrubia, Bl. , 

 Schn., Parra, XXII, 1; tlie Spare demi-lune, Lacep. IV, iii, 1; and the Colas o{ 

 Guadeloupe, Duham. Sect. IV, pi. xii, 1; M. cynodon, Cuv. or Anthias cabalk- 

 rote, Bl., Schn., Parra, XXV, liAnth. jocu, BL, Schn., Parra, XXV, 2;Sp. 

 tetracanthus, BL, 279, which is also the Vivanet gris, Lacep., IV, iv, 3; and the 

 Luijanus acutirosiris, Desmar.; M. sillao, Russel, 100; M. lunulatus, Cuv., 

 Mungo Park, Lin. Trans., Ill, xxxv, 6; Luij. erythropterus, Bl. 249; Liifj. lut- 

 janus, Id., 245; Sparus malabaricus, BL, Schn.; M. rangus, Cuv., Russel, 

 94; M. rapilli. Id., 95; ilphestes 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 Rypticus arenatus, Cuv. etVal., Ill, pi. xlvi. 



