56. LETJCiscus. 233 



identical with L. erythrophthalmus, at all events very closely allied 

 to it. The most recent investigator of the Italian freshwater-fish- 

 fauiia, C'anestrini (/. c. p. 03), doubts their specific validity. 



Hybrid between Leuciscus erythrophthalmus and Leuciscus rutilus. 



See p. 214. 



Hybrid between Leuciscus erythrophthalmus and Abramis 

 blicca. 



Bliccopsis abramo-rutilus (part.), Siehold, Siisswassevf. p. 142. 

 Brama isognatluis, Bleek. Versl. Med. Akad. Wet. Natuurk. xv. p. 235 ; 



or Nedcii. Ti/dschr. Dierk. i. 18U3, p. 371. 

 Bliccopsis erythroplithalmoides, Jcickel, Abhandl. zool.-mmeral. Ver. 



Reyensh. 1864, p. 49, and 1865, p. 38. 



This form is similar to the hybrid between Eoach and Bream (see 

 p. 214), but deeper in the body and with larger scales. 



The pharyngeal teeth are placed in a double series, the inner 

 series being composed of two, rarely three, teeth. 



Anal fin with 14-18 rays. Back of the trunk not compressed into 

 an edge ; belly behind the ventrals compressed into an edge, the 

 scales not extending across it. Snout short, obtuse ; mouth terminal, 

 Avith the jaws even. The height of the body is contained twice and 

 one-tliird, or, in young examples, twice and two-thirds in the total 

 length (without caudal). L. lat. 42-44. L. transv. 8-9/7. Four 

 and a lialf longitudinal series of scales between the lateral line and 

 ventral fin. 



These hybrids have been observed in Holland and Germany. 



a. Eight inches long. Rhine. From Dr. Bleeker's Collection. — 



T3'pe oi Brama isognathns. 



b. Five inches long. Danube. Presented by Prof. v. Siebold. 



Hybrid between Leuciscus erythrophthalmus and Alburnus 

 lucidus. 



A. J. Jiickel describes a fish from the river Mtmiihl in Bavaria 

 which he regards as a hybrid between these two species, and names 

 Alburnus rosenhaueri. Zoolog. Garten Frankf. 1866, p. 20. 



27. Leuciscus heegeri. 



Leuciscus heegeri, Agass. Mem. Soc. Hist. Xut. Neuchdtel, i. p. 38. 

 Leuciscus (Scardinins) heegeri, IJoiiaj). Faun. Ital. Pesc. 

 Leuciscus hegeri, Cuv. ^- Val. xvii. p. 230. 



D. 10. A. 11. L. lat. 60. L. transv. 9/?. 



The height of the body equals the length of the head, and is one- 

 fourth of the total (without caudal). Mouth terminal, obliquely 

 uscending forwards. There are five and a half longitudinal series of 

 scales between the lateral hue and ventral fin. The origin of the dorsal 

 fin is abo\-e the root of the innei- ventral ray. Coloration uniform. 



Pharyngeal teeth serratt'd, in two series. 



Istria. 



