FISHES. 509 



dorsal fin, and number of scales on the lateral line, may be 

 useful in distinguishing the different members of some of 

 the genera of this genus : 



a. Dorsal fin placed directly over the ventrals. Lends- 

 cus grislagine, D. 10, A. 11 ; scales on lateral line 52. L. 

 idus, D. 11, A. 13; scales on lateral line 55 to 60. J/. 

 rutilusj D. 11, A. 12 ; scales on lateral line 42 to 44. 



I). Dorsal commencing above the termination of ventrals. 

 L. latifrons, D. 11, A. 12 ; scales on lateral line 45. 



c. Dorsal placed behind the ventrals, but before the anal 

 fin. L. erythroplitJialmuSj D. 11, A. 1,4; scales on lateral 

 line 42. 



d. Dorsal standing over the space between the ventrals 

 and anal fin. L. pJioxinus, D. 9, A. 9. 



Unlike all the previously described members of this 

 family, the fish belonging to this genus do not lie grovel- 

 ling at the bottom of the water, but are quick and lively in 

 their motions, preferring clear water. 



70. LEUCISCUS GEISLAGINE, Art. ; CYPEINUS GEISLAGINE, Fries 

 and Ekst. ; C. LEUCISCUS, L. Stamm. The Dace. 

 D. F. 



Much confusion has existed respecting the identity of 

 this fish, and the many different synonymes which have 

 been used by different authors, have only tended to add 

 to, instead of diminish it. I think we may now take 

 it for granted, that the Swedish " stamm" is no other 

 than the common British dace, and that the Cyprinus 

 dobula of Kroyer's " Danish Fishes," the Leuciscus dobula 

 of Yarrell, as well as that author's Leuciscus vulgaris and 

 Leuciscus Lancastriensis, are all different forms of and 

 identical with the Cyprinus Grislagine, or ' ' Stamm " of 

 Swedish authors. 



Is common in the middle and north of Sweden, as well 

 as in Norway and Finland. I never saw an example 

 more than 8 in. in length. They spawn with us in May. 



