5(5. LEUciscus. 215 



L, transv.— ; five longitudinal series of scales between the lateral 

 line and ventral fin. 



This fish may occur in all localities in which A. brama and L. 

 rutilus are found. 



a. Fine specimen, 11 inches long. Tributary of the Colne, near 

 Hanworth, Middlesex. Presented by GreviUc Fcnnell, Esq. 



6. Half-grown. Avon. Presented by 11. F. Tomes, Esq. 



c-e. Adult (14 inches) and half-grown: skins. England. From 

 YarreU's Collection. 



/. Half-grown. Holland. 



y-h. AdiUt and half-grown. Berlin. Presented by Professor 

 Peters. 



i. Adult. Danube. Presented by Professor von Siebold. 



l\ Half-growu. Danube. From Dr. Gemminger's Collection. 



/. Half-grown. Kochel-See. Presented by Professor von tSiebold. 



Hybrid between Abramis blicca and Leuciscus rutilus. 



Abramis abramo-riitilus, Holandre, Fuune du depart, de la Muddle. 



p. 246. 



buggeuLagii, Selys-Ltnigch. Faune Beh/e, p. 21G. 



Bliccopsis abramo-rutilus, part., Siebold, Siisswasserf. p. 142. 



abramo-rutilus, Jackel, Abhaitdl. zool.- miner. Vcr. Regeitsb. 



1864, p. 53; I860, p. 40. 



This hybrid is very similar to that between the Bream and Roach, 

 and to that between A. hUcca and L. enjthroplithahnua; and specimens 

 may occur which cannot be referred positively to one of these forms. 

 The pharyngeal teeth are sometimes in a double, sometimes in a 

 single series. Anal fin mth from foiu'teen to eighteen rays. Back 

 of the tnink not compressed iuto an edge ; belly behind the ventrals 

 compressed rato an edge, dividing, or covered by, the scales. Mouth 

 terminal, with the jaws even. The height of the body is contained 

 about tmce and two-thirds in the total length (without caudal). 



L. lat. 43-46. L. transv. -^j-. Four and a half longitudinal series 

 of scales between the lateral line and ventral fin. 



Those hybrids have been observed in Holland, Belgium, and tier- 

 many. 



a. Nine inches long. Chiem-See, Bavaria. Presented by Professor 

 von Siebold. 



2. Leuciscus aula. 



Triotto. 



Gardouus, Bellon. Aquat. i. p. 317. 



Squalius aula, Bonap. Faun. Ital. Pesv. 



elatus, Bonap. I. c. 



Leuciscus fuciui, Bonap. I. c. ; Cuv. lij- Val. xvii. p. 152. 



? Leuciscus trasiraeuicus, Bonap. I. c. Cuv. S)- Val. xvii. p. 19-5. 



rubella, Bonap. I. c. Cuv. ^- Val. xvii. p. 158. 



lascha, Costa, Faun. Nap. Pesc. p. 19, t. 16. 



dobida (?), Costa, I. c. p. 23, tav. 19*. 



* The fish represented is very similar to u Leuciscus rutilus. 



