86 SALMONID^. 



place ; and the two would appear to agree in one point only, viz. that 

 the scales are more conspicuous than usual ! As regards the question 

 whether S. spectahilis (Heckel) might possibly be identical with S. 

 microlepis, I do not think that we should be justified in entertaining 

 this idea, as S. microlepis has small and rather inconspicuous scales, 

 which must be larger in ;S. spectahilis (Heckel), viz. " 120 and more." 

 The figure representing S. spectahilis is of little use; it does not agree 

 with the descrip'tion, and shows several evident inaccuracies. 



VII. France. 



15. Salmo argenteus. 



Fario argenteus, Cuv. §• Val. xxi. p. 294, pi. 616 (female), (not synon.). 

 B. 11. D.14 A. 11. P. 15. V. 10. L.lat. 123. L. transv. 26/30- 

 C£ec. pyl. 61-67. 



Attaining to a length of 2| feet. 



Head elongate, broad, depressed, its length being one-fourth of the 

 tota llength (without caudal) in a female specimen 26 inches long; 

 operculum rather long, rectangular behind, its length being contained 

 once and two-fifths in its depth ; radiating striae are conspicuous 

 especially along its lower margin ; the suboperculum is narrow, and 

 projects beyond the opercle. The posterior point of junction of oper- 

 culum and suboperculum is nearer to the lower anterior angle of the 

 suboperculum than to the upper end of the gill-opening. Prseoper- 

 fculum with the lower limb well developed, with the angle but slightly 

 roimded, and with the hind margin undulated. Snout brbad, of 

 moderate length ; jaw-bones strongly developed, even in females. 

 The maxillary is broad and strong, and extends to behind the orbit 

 in a female of the size indicated. Teeth of moderate strength. Head 

 of the vomer broader than long, with a transverse series of five or six 

 strong teeth on its hind margin ; body of this bone with a longitu- 

 dinal ridge, armed with a single series of teeth (there are three or 

 four teeth in the specimen described). 



Fins well developed ; caudal truncate in specimens above 20 inches 

 in length. Tail rather slender, covered with thin scales cngular 

 behind and not smaller than those of the body ; there are twelve or 

 thirteen scales in a transverse series running from behind the adipose 

 fin obliquely forwards to the lateral line. 



Silvery, dark on the back ; opercles with more or less numerous 

 round black spots ; sides with X-shaped spots. 



A migratory species of the Atlantic rivers of France ; occasionally 

 on the coast of England. 



a. Female, 26 inches long. River Rhymney, Monmouthshire. Pre- 

 sented by the Rev. Augiistus Morgan. (Has been kept for a 

 short time in a freshwater pond.) 



