ACANTHOPTERYGII. Ill 



Myripristis, Cuv. 



The brilliancy, shape and scales of the Holocentra, but the pre- 

 operculum has a dentated double border, and there is no spine at the 

 angle. This genus is remarkable for a natatory bladder divided 

 into two chambers, the anterior part of which is bilobate and attach- 

 ed to the cranium in two places, where the latter is only closed by 

 membrane, and which correspond to the sacs of the ears. They 

 inhabit the hot parts of both oceans.(l) 



BeryXj Cuv. 



Differs from Myripristis in having but a single short dorsal, with 

 but a few^ small spines, almost hidden in its anterior edgej ten soft 

 rays in the ventrals.(2) It is impossible to remove from it the 



Trachichthys, Shaw, 



In which, with the same roughness that exists in the three preceding 

 genera, and the same little dorsal that is seen in Beryx, we find a 

 flat spine at the lower part of the preoperculum, and one on the 

 shoulder; the abdomen and sides of the tail are covered with large 

 carinated scales.(3) 



All the Percoides of which we have hitherto spoken, have 

 their ventrals inserted under the pectorals ; there are some 

 genera, however, in which they are differently located. 



In the Percoides Jugulares, they are placed on the 

 throat further forwards than the pectorals. 



Trachinus, Lin. 

 A compressed head, approximated eyes, and an oblique mouth; the 



Fishes of Ceylon, pi. iv, Hoi. ho, Cuv., Ren., I, xxvil, 148, a very bad figure; 

 Sciaena spinifera, Forsk; Hoi. hastutum, Cuv. et Val., Ill, lix, Hoi diademOy 

 Lacep., Ill, ix, 3, or Ferca pulchella, Bennet, Zool. Journ. Ill, ix, 3; H.sammara, 

 or Scisma sammara, Forsk, or Labre anguleux, Lacep., Ill, xxii, 1, and the other 

 species described in our third volume. 



(l; Myripristis jacobus, Cuv., Desmar., Diet. Class. d'Hist. Nat.; M. Japon- 

 icus, Cuv. et Val., lU, Iviii; iJf. botche, Cuv., Russel, 105, M. parvidens, Cuv., 

 Id., 109; the Lufjan hexagone, Lacep. IV, 213; his Holocentre Thunberg, lb. 367; 

 his Centropome rouge, lb., 273; the Scisena murdjan, Forsk, also belong to this 

 genus. See Vol. Ill of our Icthyology. 



(2) Beryx decadactylus, Cuv. et Val. Ill, 222; B. lineatus, lb. 226, and pi. Ixx. 



(3) TracMchthys australis, Shaw, Nat. Misc., No. 578: and Gen. Zool., IV, 

 part II, p. 260. 



