1. SALMO. 77 



width of this space is more than one-half of the length of the post- 

 orbital part of the head. 



The posterior margin of the praeoperculum is slightly convex, the 

 lower limb being very indistinct ; the posterior margin of the oper- 

 culum is straight, and forms a right angle with the lower. A line 

 from the upper end of the gill-opening to the angle of the operculum 

 equals a line from that point to the lower anterior end of the sub- 

 operculum. The suboperculum is twice as long as broad. 



The distance of the dorsal fin from the occiput, if measured back 

 from behind that fin, reaches nearly to the root of the caudal fin. 

 The dorsal fin is a little higher than long, and consists of fourteen 

 rays, the first three being rudimentary, the fourth simple, and the 

 fifth and sixth branched and the longest of the fin. 



The anal fin is two-thirds as long as high, and consists of eleven 

 rays, the first two being rudimentary, the third simple, the fourth 

 the first branched ray, and the fifth the longest of the fin. 



The pectoral fin is somewhat shorter than the length of the head 

 (without snout), and longer than one-half of its distance from the 

 ventral. The ventral fin is much shorter, and reaches two-thirds of 

 the distance from its root to the vent ; its outermost ray is in the 

 vertical from the ninth of the dorsal ; appendage in its axil very 

 short. Caudal fin somewhat emarginate, its middle rays being two- 

 thirds the length of the outer ones *. 



There are 122 transverse series of scales, counted immediately above 

 the lateral line ; the Series descending obliquely backwards from the 

 origin of the dorsal fin to the lateral line has twenty-seven scales ; 

 that from the hinder end of the adipose forwards to the lateral line 

 has fifteen scales ; there are twenty-four longitudinal series between 

 the lateral line and the root of the ventral. Scales rounded, thin. 



II. Pyrenean Peninsula. 



The Salmonoids of the Pyrenean peninsula have not yet been 

 properly examined or described. Cornicle (Ensayo de una historia de 

 los peces de la costa de Galicia, 1788, 16mo) appears to be the only 

 author who has written about them ; but his account does not contain 

 anything by which the different species might be characterized. 

 Besides the Salmon which we have mentioned above, he mentions — 



1. The Lirio, very similar to the Salmon from the river Tambre 

 (p. 81). 



2. The Reo, a migratory Trout, representmg S. trutta or S. cam- 

 hricus, common in all the rivers of Galicia (p. 82). 



3. The Trucha, a Eiver-Trout, generally known in the whole of 

 Spain (p. 84). 



III. Asia Minor. 



Our evidence of a species of Salmo inhabiting Asia Minor is based 

 upon young specimens obtained on the summit of Mount Olympus. 

 They are evidently the young of a non-migratory Trout with a double 



* This fin is more deeply emarginate in examples less advanced in their sexual 

 development than the specimen described. 



