106 CLASS XIV. 



Routing, is found in the North, and in March and April occurs frequently 

 in the mouths of their rivers ; the ventral fins begin behind the middle of 

 the dorsal fin ; there are 7 rays in the gill- membrane. 



Salmo Lavaretus Cuv., Salmo Wartmanni BLOCH. Ichth. Tab. 105, Cuv. 

 et VAL. Poiss. xxi. PI. 627; 8 rays in the gill-membrane; the head is not 

 prolonged beyond the mouth ; from the lakes of Switzerland (Salmo Lava- 

 retus L. is a collection of different species). 



Coregonus Willugbii JABDINE, YARRELL Brit. Fish. n. p. 89; in lakes 

 of the south of Scotland (Dumfries) ; this fish appears to feed principally 

 on small fresh-water crustaceans, water-fleas, &C. 1 



Thymallus Cuv. Teeth very short, conical, in a single row in 

 jaws; palate furnished with very small and few teeth. Tongue 

 smooth. Dorsal fin long, high. Caudal fin forked. Branchiostegous 

 membrane with 8 10 rays. 



Sp. Salmo Thymallus L., BLOCH Ichth. Tab. 24 (probably Thymallus gym- 

 nothorax VAL., Cov. et VAL. Poiss. PI. 625), &c. 



In these fishes the dorsal fin has 20 or more rays, whilst there are about 

 15 in the species of the preceding sub-genus. 



Mallotus Cuv. Teeth very short, conical in palate and maxillae, 

 somewhat longer in tongue. Pectoral fins large. Dorsal fin placed 

 over ventrals. Caudal fin forked. Branchiostegous membrane with 

 8 rays. Scales small. 



Sp. Salmo arcticus 0. FABR., Clupea villosa GMEL., Salmo groenlandicus 

 BLOCK. Ichth. Tab. 381, fig. i, Cuv. et VAL. Poiss. PI. 622; in the male 

 along the lateral line are long narrow scales standing close together, which 

 from their softness resemble felt. These fishes are sometimes found on the 

 shore of Greenland, inclosed, as modern petrifactions, in a clayey earth. 

 See the figures in AGASSIZ Poiss. foss. V. PI. 60. Comp. ibid.v. i, pp. 98 

 100, Mallotus villosus. 



Osmerus ARTEDI (in part), Cuv. Teeth in maxillae small, in- 

 curved, conical, in vomer and tongue thick, in palate conical in a 

 double row. Branchiostegous membrane with 8 rays. Caudal fin 

 forked. 



Salmo Eperlanus L., BLOCH Ichth. Tab. 28, fig. 2, Cuv. et VAL. Pom. 

 xxi. PI. 620 ; the smelt; occurs abundantly at the mouth of rivers in Hol- 

 land, confined to the eastern and western coasts of Great Britain, YARRELL 

 JBr. Fishes, n. p. 75. 



Salmo Cuv. (Solar, Fario, Salmo YALENC.). Teeth conical, in a 

 single row in maxillae; teeth in vomer, in palate and tongue. 



1 Cyclops, see Vol. I. p. 632, Daphnia 641, &c. 



