1. SALMO. 81 



dal fin distinctly emarginate. • Silvery, with a few scattered small 

 black spots on the trunk, those on the head being larger and more 

 numerous ; fins immaculate. 



This is a non-migratory species from the Lago di Garda ; and 

 although it was known in the sixteenth century, the knowledge of 

 its characters and habits is very incomplete, Heckel being the only 

 recent naturalist who has given an account of some specimens in the 

 Vienna Museum. 



10. Salmo lemanus. 



The Trout of the Lake of Geneva. 

 Umbla altera, Rondelet. ii. p. 160. 

 Salmo lemanus, Cuv. likgiu Anim, 

 La truite, Jurine, in Mem. Soc. Phys. et Hist. Nat. Genive, iii. 1. 1825, 



p. 158, pi. 4. 

 Salmo trutta, Agass. Pmss. cCeau douce, pi. 8 (female). 

 Fario lemanus, Cuv. 8f Vol. xxi. p. 300, pi. 617 (male). 



D.13. A. 12. P. 14. V. 9. L. lat. 115-128. L. transv. 26-28/36. 

 Ckc. pyl. 45-52. Vert. 57 (once), 58-59. 



Head well proportioned in its shape, of moderate size ; body rather 

 stout. The posterior point of junction of operculum and suboper- 

 culum is nearer to the lower anterior angle of the suboperculum 

 than to the upper end of the gill-opening. Praeoperculum with a 

 distinct lower limb ; operculum rather broad and high. Snout of 

 moderate length, rather produced in the male sex, in which a man- 

 dibular hook is developed in the spawning-season. MaxiUary longer 

 than the snout, and at least as strong and broad as in S. fario ; in 

 specimens twelve inches long it extends somewhat behind the vertical 

 from the hind margin of the orbit. Teeth moderately strong ; those 

 on the vomer in a single series, alternately bent towards the right 

 and left, persistent throughout life. Pectoral fin rounded, its length 

 being less, and in young individuals more than, one-half of its dis- 

 tance from the ventral. The caudal becomes tnmcate with age ; in 

 specimens of from 12 to 15 inches in length, it is emarginate, the 

 middle rays being half as long as the outer ones. The hind part of 

 the body of moderate depth ; there are thirteen or fourteen scales in 

 a transverse series descending *rom behind tbo adipose fin forwards 

 to the lateral line. 



Back greenish, sides and belly silvery, numerous very small X- 

 shaped black spots on the sides. Opercles and dorsal fin with numer- 

 ous black dots. The other fins greenish. 



A non-migratory species from the Lake of Geneva and Lago 

 Maggiore. 



n-h. From 7-15 inches long. Lake of Geneva. Presented by the 

 Museum of Natural History of Geneva. — None of these speci- 

 mens are sexually developed : they were caught in the month 

 of August. 



i. Female, sexual organs not developed : 12 inches long. From 

 Prof. Agassiz's Collection. 



