566 



TELEOSTEI 



c. Branchiostegal rays 6 to 10; ventral rays 6 to 8 ; stomach 

 caecal ; pyloric appendages few (2 to 11) or rather numerous. 

 Osmerus, Thaleichthys, Mallotus, Plecoglossus, Hypomesus. 



d. Branchiostegal rays 3 or 4 ; ventral rays 8 to 10; stomach 

 caecal ; pyloric appendages absent. Microstoma, Nansenia, 

 Bathylagus. 



B. Air-bladder absent ; branchiostegal rays 3 to 6 ; ventral 

 rays 6 or 7 ; stomach siphonal ; pyloric appendages absent. 

 Retropinna, Salanx. 



Only about 80 species can, at present, be regarded as valid. 



FIG. 342. Distribution of Salmonidae (deep-sea forms not included). 



The beauty, gameness, arid great economical value of the 

 Salmonids have caused more attention to be bestowed on them 

 than probably upon any other group of fishes. As Professor 

 Smitt tells us, a Swedish proverb says " A dear child has many 

 names," and this applies well to our Salmon and Trout, the species 

 of which have been unduly multiplied by some writers. The genus 

 Salmo, characterised by a large mouth arid powerful dentition, 

 is divided into three sections : Oncorhynchus, Quinnat Salmon, 

 of the North Pacific, ascending rivers in North America and Asia, 

 with 12 to 17 developed rays in the anal; Salmo, Salmon and 

 Trout, with 8 to 12 rays in the anal, and teeth not only on the 

 head of the vomer but also along its shaft, at least in the young, 



