I 



11. COKEGONUS. 195 



ninths or one-fifth of the total (wdthout caiidal). 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 little 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 

 ventral fin. 

 l»reland. 



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

 Purchased. 



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

 terson, Esq. and Prof. W. Thomson. 



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

 YarreU's Collection. 



Tc-n. Adult. Purchased of Mr. Stevens. 



31. Coregonus lucius. 



FCoregonus sardiuella, Cm.S)- Val. xxi. p. 517. 



clupeoides, Lilljehorc/, Vet. Akacl Handl. 1850 (1851), p. 304; 



Nilss. Skand. Faun. Fisk. p. 466. 

 lucius, Nilss. 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. V. 12. L. lat. 88. L. transv. 9/11. 



Apparently allied to C.pollan. The height of the 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 of the dorsal fin. Eye rather large, MaxiUary 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 least depth of the tail. Pectoral longer than the head, -nathout 

 snout. There are nine longitudinal series of scales between the 

 lateral line 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 Pallas's Collec- 

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



o2 



