56. LEUCI8CUS. 215 



JQl 



L. transv.-Y; five longitudinal series ol scales between the lateral 

 line and ventral fin. 



This fish may occui in ail 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 GreviUe Fennell, Esq. 



b. Half-grown. Avon. Presented by R. F. Tomes, Esq. 



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



l''arreU's Collection. 

 /. Half- grown. Holland. 

 g-h. Adult and half-grown. Berlin. Presented by Professor 



Peters. 

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

 k. Half-grown. Danube. From Dr. Gemminger's Collection. 

 1. Half-grown. Kochel-See. Presented by Professor von Siebold. 



Hybrid between Abramis blicca and Leuciscns rutilus. 



Abramis abramo-rutilus, Hoktudre, Famie du depart, de la Moselle. 



p. 246. 



buggenhagii, Silys-Lcngch. Faune BelgCj p. 216. 



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



abramo-rutilus, Jackel, Abhandl. zool.-miner. Ver. Hege/isb. 



1864, p. 53; 1865, p. 40. 



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

 and to that between A. blicca and L. erythrophthalmus; 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 with from fourteen to eighteen rays. Back 

 of the trunk not compressed into an edge ; beUy behind the ventrals 

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

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

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



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

 of scales between the lateral line and ventral fin. 



These hybrids have been observed in Holland, Belgium, and Ger- 

 many. 



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

 von Siebold. 



2. Leuciscus aula. 



Triotto. 



Gardonus, Bellon. Aquat. i. p. 317. 



Squalius aula, Bonap. Faun. Ital. Peso. 



elatus, Bonup. I. e 



Leuciscus fucini, Bonap. I. c. ; Cuv. *■ Val. xvii. p. 152. 



? Leuciscus trasimeniciis, Bonap. i. c. Cuv. Sc Val. xvii. p. 195. 



rubella, Bonap. I. c. Cuv. Sf Val. xvii. p. 158. 



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



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



* The fish represented is very similar to a Leuciscus rutiltis. 



