11. COREGONXJS 195 



Xiinths or one-fifth of tHe total (without caudal). The distance of 

 the occiput from the front margin of the upper jaw is less than one- 

 half, very rarely one-half, of its distance from the origin of the dorsal 

 fin. The diameter of the eye is as long as the snout, and one- 

 quarter or a Kttle less than one-quarter of the length of the head ; 

 length of the -mandible more than the least depth of the tail. Pec- 

 toral as long as the head, without snout. There are eight longi- 

 tudinal series of scales between the lateral line and the root of the 

 s^entral fin. 

 I»reland. 



a-b. Fine adult specimens (10 and 11 inches long). Ireland. 

 Purchased! 



c-d. Many adult specimens. Lough Neagh. Presented by "R. Pat- 

 terson, Esq. and Prof. "W, Thomson. 



e-h, i. Adult ; skins. Lough Neagh. From Messrs. ParneU's and 

 YarreU's Collection. 



k-n. Aault. Purchased of Mr. Stevens. 



31. Coregonus lucius. 



? Coregonus sardinella, Cuv. Sf Vol. xxi. p. 517. 



clupeoides, LUljeborg, Vet. Akad. Handl. 1850 (1861), p. 304; 



NUss. Skand. Faun. Fisk. p. 466. 

 lucius, NUss. I. c. 



B. 9. D. 14. A. 18. V. 11. L. lat. 110-112. 

 The height of the body is nearly one-sixth of the total length, 

 the length of the head two-ninths. Maxillary long, extending to 

 below the middle of the eye; mandible very long, prominent. 

 {Nilss.) 



A migratory species periodically ascending rivers east from the 

 North Cape. 



t Asiatic species. 



32. Coregonus merkii. 



Salmo clupeoides, Pall. Zoogr. Ross.- As. iii. p. 410 (not Lacep.;. 

 D. 12. A. 16. Y. 12. L. lat. 88. L. transv. 9/11. 



Apparently allied to G.pollan. The height of tho body is scarcely 

 more than the length of the head, which is one-fifth of the total 

 (without caudal). The distance of the occiput from the front 

 margin of the upper jaw is less than one-half of its distance from 

 the origin o^ the dorsal fin. Eye rather large. Maxillary long, 

 not much more than one-third of the length of the head, 'with a 

 longitudinal ridge. The length of the mandible is rather more than 

 the lea'fet depth of the tail. Pectoral longer than the head, without 

 snout. There are nine longitudinal series of scales between the 

 lateral Une and the roof of the ventral fin. 



A migratory species, periodically ascending the Kolima and other 

 Siberian rivers. 



These characters are taken from an example from PaUas's Collec- 

 tion, now in the Berlin Museum, and 15 inches long. Valenciennes, 



o2 



