208 BRITISH FRESHWATER FISHES 



Bavaria in the British Museum has eight branched 

 rays in the dorsal fin and thirteen in the anal, forty- 

 six scales in the lateral line, nine and a half between 

 the origin of the dorsal fin and the lateral line, and 

 four and a half between the lateral line and the base 

 of the pelvic fin. The pharyngeal teeth are in two 

 series, 1.55.1. 



The hybrid between the Bream and the Rudd 

 was little known until I described it a year or two 

 ago from fourteen examples in the collection of the 

 British Museum ; nine were sent to me from Lough 

 Erne by Major Trevelyan, and one of these, nearly 

 10 inches long, is figured (PI. XXX, Fig. 2); 

 three from Colebrooke, Upper Lough Erne, were 

 received in 1871 from Sir Victor Brooke; one from 

 Thetford was presented by Dr. Giinther in 1879, 

 and one is a skin from Yarrell's Collection. The 

 Bream x Rudd hybrid differs from the Bream x 

 Roach hybrid in the same way that the Rudd does 

 from the Roach. The body averages deeper, the 

 greatest depth being contained two and one-fourth to 

 two and two-third times in the length to the base 

 of the caudal fin. The mouth is more oblique, with 

 the jaws equal or the lower the shorter. The dorsal 

 fin is farther back and usually has fewer rays, nine 

 (eight to ten) instead of ten (nine to eleven) branched 

 ones. The pharyngeal teeth are usually in two 

 series, and the main row never has more than five 

 teeth. 



The numerical characters of this hybrid and of 

 the parent species may be contrasted with those of 

 the Bream x Roach hybrid and its parent forms 

 given above : 



