OO SALMONID^. 



opening. The praeoperculum is so short in the longitudinal axis of 

 the hody that it has scarcely a trace of a lower limb. Snout 

 moderately produced in old males, very short and obtuse in young 

 specimens ; the lower jaw with a distinct hook in old males. Max- 

 illary longer than the snout, narrower and less strong than in. S. fario ; 

 in specimens 1 4 inches long it extends nearly to the vertical from 

 the hind margin of the orbit, and at no age does it reach much beyond 

 it. Teeth rather strong : those of the vomer disposed in a double 

 series, but in a zigzag line ; most of them are lost in specimens 

 17 inches long, only a few of the anterior remaining. Fins small, 

 short, and rounded, the length of the pectoral of mature examples 

 being less than one-half of its distance from the ventral. The caudal 

 fin is truncate in specimens 10 inches long, but does not become 

 convex at any age. The hind part of the body is of moderate depth ; 

 there are about fifteen scales in a transverse series descending from 

 behind the adipose fin to the lateral line. 



Sides of the body with more or less numerous X-shaped or ocel- 

 lated black spots, some red spots along and below the lateral line ; 

 dorsal with round black spots. Dorsal, anal, and ventral fins with a 

 white and black outer margin in young examples. 



A migratory species from the rivers Forth, Tweed, and Ouse. 



a. Male, stuffed : 30 inches long. Firth of Forth. From Mr. Par- 



nell's Collection. 



b. Male, skin, type of the figure, pi. 32. fig. 3 : 13| inches long. 



River Tweed. From Mr. Pamell's Collection. 



c-d. Skins, 8 and 10 inches long. Tributary of Forth. From Mr. 

 Pamell's Collection. 



e. Skin, 27^ inches long. Great Britain. From Mr. YarreU's Col- 

 lection. 



f-g. Male and female, 17 and 18 inches long. River Ouse. Pre- 

 sented by J. H. Phillips, Esq. Caught Sept, 18th. 



This is one of the best-marked species of Salmo ; its remarkably 

 -short head, and the extremely short praeoperculum render it one of 

 the easiest of determination. It is evidently nearly allied to the 

 non- migratory species. Pamell named three of our specimens S. fario, 

 and a larger one S. eriox. 



18. Salmo fralUvensis. 



Gralway Sea-Trout. 

 B. 11. D. 13. A, 11-12. P. 15. V. 9. L, lat, 125. 

 L. trans. 25/38. Vert. 59. Ceec.pyl.44, 

 Head rather small, very convex above, with the snout of moderate 

 length, but terminating in an acute point. Eyes rather small. Oper- 

 culum of moderate width and depth ; suboperculum narrow ; prae- 

 operculiim with a distinct lower lunb. The posterior point of junc- 

 tion of operculum and suboperculum is much nearer to the lower 

 anterior angle of the suboperculum than to the upper end of the 

 gill-opening. Maxillary very narrow and feeble, extending a little 

 beyond the hind margin of the orbit in females 18 inches long, and 



