2. PERcrcnravs. 61 



2. PERCICHTHYS. 



Perca,, sp., Cw. Sf Val. ii. p. 19. 



Peiriclitliys, flirard, Proc. Ac. Nat. Sc. Phihul. 1854, p. 197, and U.S. 

 Nav. Astron. Exped. ii., Zool. p. 230. 



Seven or six branchiostegals. All the teeth villiform, without 

 canines ; teeth on the palatine bones, tongue smooth. Two dorsals, 

 the first with nine (or ten) spines ; anal fin with three spines. Oper- 

 culum spiniforous ; prsDopcrculum and prscorbital serrated. Scales 

 small ; head covered with scales above. 



Fresh waters of the Neotropical region. (Java.) 



1. Percichthys Isevis. 



Perca la^^•is, Jenyvs, Znnl. of the Beagle, Fishes, p. 1. pi. 1. 

 D.9|l A.I. 



Height of the body not quite one-fifth of the total length, the 

 head not quite one-fourth. Head above covered with scales, as far 

 as the connecting line of the nostrils ; scales rather smooth, scarcely 

 at all ciliated. Caudals slightly notched. Yellowish brown (in 

 spirits), covered all over with small dusky spots, one occupying the 

 base of each scale. (Jenyns.) 



Santa Cruz River, Patagonia. - 



2. Percichthys trucha. 



Perca trucha, Cuv. S/- Val. ix. p. 429; Guichen. in Gay, Historia clc 

 Chile, Zool. ii. p. 146. pi. 1 b. fig. 1. [It appears doubtful, from 

 Girard's examination, whether this figure is made from a specimen, 

 or from the description given by Valenciennes.] 



Percichthys ti'ucha, Girard, Proc. Ac. Nat. Sc. Philad. 1854, p. 197. 



? Percichthys chilensis, Gir. in U.S. Nav. Astron. Expcd. ii., Zool. 

 p. 231. pi. 29. f. 1-4. 



B.7. D.9|l. A.i. 



The upper maxillary bone reaching to below the middle of the 

 eye ; sub- and interoperculura scarcely denticulated ; caudalis mode- 

 rately emarginated ; scales ciliated. Yellowish brown, spotted with 

 darker. 



Rio Negro (Patagonia) ; fresh waters of ChiU. 



3. Percichthys melanops. 



Girard, Proc. Ac. Nat. Sc. Philad. 1854, p. 197; U.S. Nav. Astron. 

 Exped. ii., Zool. p. 233. pi. 30. f. 1-5. 



B. 6. D. 10 I 1 A. |. L. lat. 58-60. L. transv. 10/22. 



Branchiostegals six ; the upper maxillary bone reaching to the 

 level of the anterior margin of tlu^ eye ; opercular spine not veiy 



