214 CYPRINID^. 



Hybrid between Leuciscus rutilus and Leuciscus 

 erythrophthalmus. 



(ScardiniojJsis, Jackcl.) 



The practice initiated by Professor v. Siebold, to give to fishes 

 known to be hybrids not only specific but also generic names, has 

 already been followed by a Bavarian naturalist, A. J. Jackel, who, 

 having discovered a supposed hybrid between the Eudd and Roach, 

 describes it under the high-sounding denomination of Scardiniojjsis 

 anceps, mihi. It is said to have the phaiyngeal teeth deeply ser- 

 rated, sometimes in one series, 5 — 5, sometimes in two, 5 or 6 . 1 or 

 2 — 1 or 2 . 5. The mouth is terminal, more or less oblique ; body more 

 or less elevated. Origin of the dorsal fin in the vertical from the 

 extremity of the axillary scale of the ventral fins. L. lat. 40-42. 

 Seven longitudinal series of scales above the lateral line, and four be- 

 tween it and the ventral fin. D. 13. A. 14-15. Specimens of 

 this hybrid were found in Bavaria, and are described in Abhandl. 

 zool.-miner. Vereius Regeusb. 1864, p. G4, and 1865, p. 44. 



We may mention here that the fish shortly noticed by Valen- 

 ciennes as Leuciscus affinis (Cuv. & Yal. xvii. p. 150) was believed by 

 fishermen to be a hybrid between the Roach and Rudd. 



Hybrid between Abramis brama and Leuciscus rutilus. 



{Ahrariiidopsis, Siebold. ) 



The Pomeranian Bream. Der Leiter. 



Cyprinus buggenhagii, Bl. Fische Deutschl. tab. 95. 



Abramis leuckartii, Heckel, in Ann. Wien. Mus. i. p. 229, taf. 20. 

 fig. o ; Nordm. in Dcmidoff, Voy. Russ. Merid. iii. p. 508 ; Cav. ^ 

 Val. xvii. p. 59; Meckel i^- Kner, Siisszcasserf. p. 117. fig. 61. 



buggeuliagii, Thompso7i, Proc. Zool. Soc. 1837, p. 56 ; or Nat. 



Hist. Ireland, iv. p. 137 ; Yarrell, Brit. Fish. 2nd edit. i. p. 391 j 

 3rd edit. i. p. 407; Ccntch, Fish. Brit. Isl. iv. p. 42, pi. 189. 



Abramis beckelii, Seh/s-Longch. Faun. Beige, p. 217, pi. 8. 



Leuciscus biiggenhagii, Cuv. ^ Val. xvii. p. 53. 



Abramidopsis leuckai'tii, Siebold, Siissioasse?-/. p. 117. fig. 61 ; Jackel, 

 Abhandl. zool. -miner cd. Ver. Begensb. 1864, p. 38 ; 1865, p. 36. 



It is due to the researches of Professor von Siebold that this fish 

 is shown to be in all probability a hybrid between the common 

 Bream (Abramis bramct) and some species of Leuciscus, which can 

 hardly be any other than the Roach. The Pomeranian Bream is a 

 Roach-like modification of the Bream or a Bream-like modification 

 of the Roach, but, as is always the case with hybrids, some of 

 the apparently most essential characters are subject to variation. 



The pharyngeal teeth are in a single series, though Siebold has 

 met with rare exceptions in which an additional tooth was placed 

 in a second series. Anal fin with eighteen or nineteen rays. Back 

 of the trunk not compressed uito an edge ; belly behind the ventrals 

 compressed into an edge, which, however, is covered with angulai'ly 

 bent scales. Snout short, obtuse ; mouth terminal, with the jaws 

 nearly even. The height of the body is contained twice and three- 

 fourths or thrice in the total length (without caudal). L. lat. 48-50. 



