138 SALMONIDiE. 



mens than the one described the two outer rays arc somewhat less 

 lengthened. 



The scales are very conspicuous, comparatively much larger than 

 in the other British species. Those between the dorsal fin and lateral 

 line are nearly square, with the hind margin rounded. Those of the 

 lateral line are not larger than the others ; and their number, there- 

 fore, nearly coincides with the number of the transverse series. The 

 scales on the back arc the smallest, yet very distinct. 



Sides and beUy silvery ; the scales on the sides of the back have a 

 silvery centre and a blackish margin ; the back itself is bluish black ; 

 belly with a reddish shade ; sides with scattered light-orange-coloured 

 dots ; fins blackish ; the dorsal lighter superiorly, and with a few light 

 dots at the base ; ventral with a narrow whitish margin. Head silvery, 

 black above. 



11. Salmo colli. 



Gilnth. Proc. Zool. Soc. 1863, p. 12, pi. 2. 

 D. 14. A. 12. P. 13. V. 9. L. lat. 160. Vert. 63. 

 Caec. pyl. 42. 



Body slightly compressed and rather elongate, its greatest depth 

 being contained four times and three-fifths or five times in the distance 

 of the snout from the end of the middle caudal rays. The length of the 

 head is one-half of the distance between the snout and the vertical 

 from the origin of the dorsal fin. Head compressed ; interorbital space 

 nearly flat, its width being less than twice the diameter of the eye. 

 Jaws of the male of equal length anteriorly ; teeth very small, four 

 to six in each intermaxillary, fourteen to seventeen in each maxiUary. 

 Pectoral shorter than the head, terminating at a considerable distance 

 from the origin of the dorsal and of the ventral. Bluish-black above ; 

 sides silvery with scattered light-salmon-coloured dots ; belly red- 

 dish ; fins black, the anal and the paired fins with a reddish tinge, the 

 anal and the ventrals with a narrow whitish margin. Pyloric appen- 

 dages extremely short, the longest being three lines long, the shortest 

 one line. 



A small species (7-8 inches long) from Ireland ; Loughs Eskc, 

 Dan. 



a. Several specimens. Lough Eske. Pi-esented by Th. Brooke, Esq. 



— Types of the species. 

 6. Female, inches long, with mature ova. Lough Dan. Presented 



by li. H. Scott, Esq. 



DtscrijHiom of a Male and a Female specimens, 7| inches long. 

 Head and body slightly compressed, not elevated, the greatest depth, 

 which is below the origin of the dorsal fin, being contained four 

 times and three-fifths (female) or five times (male) in the total length 

 (to the end of the middle caudal rays). The least depth of the tail is 

 considerably less than the length of the base of the dorsal fin. The 

 liL'ight of the head above the mandibulary joint is more than the 



