74 PKKCID^. 



1. Percarina demidoffii. 

 Nordmann, I. c, Poiss. pi. 1. f, 1. 



^-'^^l^^.- A.^„. L.lat. 34-36. 



In habit similar to Acerina cernua. Caudalis forked. Yellow'ish, 

 with round black spots on the back, and with a large brown semi- 

 lunar blotch on the neck. 



Dniester. 



11. LUCIOPERCA. 



Liicioporca,. Otiv. Btgne Anim. ; Cuv. Sf Val ii. p. 1 10. 



Seven branchiostegals. Teeth in villiform bands, some on the 

 jaws and on the palatines being longer ; teeth on the palatine bones ; 

 tongue smooth. Two dorsals, the first with 12-14, the anal fin 

 with two spines. Operculum spiniferous ; praioperculum serrated, 

 with a simple edge. Scales small. 



Rivers of the Arctic Regions. 



1. Lucioperca wolgensis. 



Perca wolgensis, Pall. Voi/. (Trad. Franq.) p. 99. pi. 8; Linn, Gmel. 



p. 1309 ; Bl. Schti. p. 91. 

 Centropomus sandat, var., Lacep. iv. p. 203. 

 Perca asper, Pall. Zoof/r. Po.ss. iii. p. 247. 

 Lucioperca wolgensis, Cur. 4" J'^d- ii- p- 117, vii. p. 441 ; Norihnantt 



in Dcmidoff, Voy. Puss. Mcrid. iii. p. 303. pi. 1. f . 2 ; Gitnther, 



Wieym. Arch. 1854, p. 210. 



Operculum with a rather obtuse and flat point behind ; crown, 

 operculum, proe- and .suboperculum covered with scales ; 80-85 

 transverse rows of scales ; three ca^ca pylorica ; no large black spot 

 on the posterior part of the first dorsal fin. 



Rivers of Southern and Asiatic Russia. 



2. Lucioperca americana. 



Lucioperca americana, Valencicfuies,u. p. 122. pi. IG; Kirtland, Zool. 

 Ohio, p. 19, and Bust. Jonrn. iv. p. 237. pi. 9. t. 2 (bad) ; Rich. Faun. 

 Bor.-Amer., Fishes, pp. 10 & 14; Dckay, Xew York Fauna, Fishes, 

 p. 17. pi. 50. f. 163; Aya.ss. Lake Super, p. 294. 



Operculum ^nth a strong acute spine 1)chind ; occiput, operculum, 

 prae- and suboperculum covci'ed with scales ; 1 00 transverse rows of 

 scales ; three caica pylorica ; a large black spot on the posterior part 

 of the first dorsal fin. 



Canada ; United States. 



a. Large specimen : stuffed. .\lt)any l^ivrr. I'resented l)y Sir 

 ,T. Richardson 



