2. PERCICnTIIYS. 61 



2. PERCICHTHYS. 



Pcrcn, sp., Citv. (^ Val. ii. p. 19, 



Porcichthys, Girard, Proc. Ac. Nat. Sc. Philad. 1854, p. 197, and U.S. 

 Nuv. Astron. Expcd. ii., Zool. p. 230. 



Seven or six brancliiostcgals. All the teeth villiibrm, without 

 canines; teeth on the palatine bones, tongue 8moot\. Two dorsak, 

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

 cuhim spiniferous ; pncoporeulum and prcDorbital serrated. Scales 

 small ; head covered with scales above. 



PVesh waters of the Neotropical region. (Java.) 



1. Percichthys laevis. 



Perca laevis, Jenynsy Zool. of the Beayle, Thhes, p. 1. pi. 1. 

 D.9|l. A.f 



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

 head not (juito (>n(;-fourth. Head above covered with scales, as far 

 {IS the connecting line of the nostrils; scales rather smooth, scnrcely 

 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. 



Porca trucha, Cuv. 8f Val, ix. p. 429 ; (Suichcn. in (hit/, Ifisforia de 

 Chile, Zool. ii. p. 140. pi. 1 h. fig. 1. [It app(;ara doiibtful, from 

 Girard's examination, wliothor this figure is made fntm a .spcM-imon, 

 or from tlu; description given by ValiiricionnoH.] 



INirciclithys trucha, 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|f3. A.l. 



The upper maxillary bono reaching to below the middle of the 

 eye ; sub- and int(!ropcrculum scarcely (Umticulated ; caudalis mod«i- 

 rately emarginated ; scales ciliated. Yellowish brown, spotted with 

 darker. 



Rio Negro (Patagonia) ; fresh waters of Chili. 



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 i A. 1. *L. lat. 58-00. L. transv. 10/22. 



Branchiostegals six ; the upper maxillary bono reaching to the 

 level of the anterior margin of the eye ; opercular spine not very 



