72 PEECID^. 



9. ACERINA*. 



Acerina, Cuv. Rbgne Anim. ; Cuv. ^ Val. iii. p. 8. 



Seven, bninchio.stegals. All the teeth \iUiform, without canines ; 

 no teeth on tlie palatine bones or on the tongue. One dorsal witli 

 thii'teen to nineteen spines, the anal fin wdth two. Opereulum and 

 pra;operculum spiniteroiLS. Muciferous channels of the bones of the 

 skull very developed. Scales rather small. 



Eivcrs of the Pahcarctic Region. 



1. Acerina cemua. 



Cerniia fluviatilis, BeUon. Aquat. p. 291 ; Gesncr, pp. 191, 192, 226 ; 



WilhKjhby, p. 3.34 ; Ray, p. 144. 

 Percre Huviatilis g-rmis miiiu,-;, Gesner, pp. 701, 825. 

 Piscis Danubii, Schr(ill (ii-nnan., Gesner, p. 20. f. 1()1. 

 Porcus fluviatilis, Peica Huviatilis minor, &.C., Gesner, f. 160 «. 

 Perca minor, Porcus, Porculus, &c., Sehoner. p. 56. 



fluviatilis miuor, Aldruv. v. cap. 34; Jonston, iii. tit. 3. cap. 2, 



t. 28. f. . _ 



Danubii incola, Piscis SchroUus, Ahlrov. v. cap. 35. 

 Scrollus, Jonsfon, iii. tit. 3. cap. 3. t. 28. f. a (riolit hand). 

 ScroUus dauubiaiuis, WiUui/hhxi, p. 335 ; Ray, p. 143. 

 Goldfisch, Schwenl-f. TJierioyr'. Siles. p. 441. 

 Perca no. 3, Artedl, Spec. p. 80. 

 no. 4, Artedi, Genera, p. 40. 



cemua, Linn.; Gronor. Sytsf. ed. Gray, p. 112; Sefiepjfer, Pise. 



liavar. R(disbonensium Pentas. ; Rloch, pi. 53. f. 2: Meidiinjer, t. 3; 

 Don. Brit. Fishes, ii. pi. 39 ; Tiirton, Brit. Fauna, p. 100 ; Jenyns, 

 Man. 334 ; Midler, Zool. Dan. Pi-odr. 392. 



Perca no. I, Klein, Hist. Pise. v. p. 40. 



Duhamel, Pec/ies, iv. p. 39. pi. 8. f. 1 ; Marsiyli, iv. p. 67. tab. 23. f. 2 



(Perca no. 2). 

 Gymnoceplialus cernua, Bl. Schn. p. 345; White, C'atal. of Brit. 



Fishes, p. 12. 

 Holoceutms post, LacejJ. iv. p. 357. 

 Cemua fluviatilis, Flem. Brit. Anim. p. 212. 

 Acerina vulgaris, Cuv. Sj- Val. iii. p. 4. pi. 41, vii. p. 448 ; Fries och 



Fckstrom, Skand. Fisk. p. 9. t. 1. f. 2 ; Yarrell, Brit. Fishes, i. 



p. 18 ; Cur. Reyne Anim. Bl. pi. 9. f. 2 ; Nordniann in Deniidnff, 



Voy. Russ. Merid. iii. p. 368 ; Gunther, Fische des Neckars, p. 14. 

 Acerina cenuux, Glinther in Wiegm. Archie, 1855, p. 199. pi. 10. f. 1, 2. 



D. '-^. A. g^g. L. lat. 55-60. Vert. 15/20-21 (22). 

 Case, pylor. 3. 



Greenish oHve, marbled and spotted with bro'mi ; dorsal and 

 caudal fins bi'own-spotted. Head Avithout scales. 



Elvers of England, France, Switzerland, Germany, Sweden, 

 Norway, Eussia, Siberia. 



a. Adult. Danube. (<jymnoihora.v.) 



b. Adult. Switzerland. Presented by Prof. Agassiz. 



* Acerina zillii, Gervais, Ann. Sc. Nat. 1848, p. 203, does not belong to this- 

 genus. — Algiers. 



