192 SALMONID^. 



26. Coregonus nilssoni. 

 BlSsik. 



? Coregonus nilssoni, Cuv. 8f Val. xxi. p. 497, pi. 631. — Rapp has shown 

 (Bodensee, Fische, p. 17) that Valenciennes confounded under this 

 name a Coregonus from the Lake of Constance ( C. wartmanni) with 

 a Scandinavian fish. It appears to us even doubtful whether the 

 entire description and the figure are not taken from the Swiss 

 species which had been sent to the Paris Museum by Georg von 

 Martens (not Mertens). 



Coregonus nilssonii, Niks. Skand. Faim. iv. p. 460 ; Widegren, Ofvers. 

 Vet. Akad. Fork. 1863, p. 587. taf. 10. fig. 3 (head). 



B. 8-9. D. 14-15. A. 15. L. lat. 85-88. 



Head small, tapering, contained five times and a half in the total 

 length (with the caudal) (more than six times, Wider/ren) ; the depth 

 of the body equals the length of the head. Snout truncfited, with 

 the jaws nearly equal in length, rather longer than the eye, the 

 diameter of which is one-fourth or one-fifth of the length of the 

 head. The maxiUary extends to the vertical from the front margin 

 of the eye ; the length of the mandible is more than the least depth 

 of the tail [and equal to the distance between eye and posterior 

 margin of operculum ?]. 



The typical specimens were from Lake Ring, near Lund in Sweden ; 

 but the species is said to occur in several other lakes of Sweden and 

 Lapland ; it attains to a length of from 10 to 12 inches. 



8. Lower Jaw the longer (Argyrosomus, Agass.). 



* Body elongate, its height being less than 07ie-third of the total length 

 (unthout caudal). 



t European species. 



27. Coregonus albula. 



Sikloja, Smasik, Stint, Rabboxe, Sil (Sweden) ; Lakesild, Skadd, 



Wemme (^Norway) . 

 Coregonus, Artedi, Gen. p. 9. no. 1 ; Synon. p. 20. no. 1 5 Spec. p. 40. 



no. 2. 

 Sahuo (Coregonus) albula, L. Syst. Nat. i. p. 512; and Faun. Suec. 



L353 ; Retz. Fauna, p. 349 ; Pall. Zoogr. iii. p. 413. 

 o marsenula, Bloch, Fische Deutschl. i. p. 176, taf. 28. f. 3. 



Le Wemme, Ascan. t. 29. 



Sikloja, Fkstr. Vet. Akad. Handl. 1834, p. 16. 



Coregonus albula, Fkstr. Fische Morko, p. 203 ; Cuv. 8f Val. xxi. p. 520 

 (descr. part.) : pi. 633 appears to have been taken from a Swedish 

 example ; at all events, the figure does not represent the Vendace 

 of Scotland. 



Coregonus albula, Nilss. Skand. Faun. Fisk. p. 465 ; Lloyd, Skand. 

 Advent, i. p. 135; Kroyer, Damn. Fisk. iii. p. 93; Siebold, Siiss- 

 wasserf. p. 265 ; Malmgren, Finl. Fiskfauna, p. 55. 



Vettern's Sikloja, Widegren, Ofvers, Vet. Akad. Forhandl. 1863, 

 p. 591, taf. 9. figs. 1-2. 



D. 12-13. A. 15-16. L. lat. 75-84. L. transv. 9/10. Vert. 57-58. 



The distance of the occiput from the front margin of the upper 



jaw is one-half, or a little more than one-half, of its distance from the 



