SORTATION. 31 



matter over until we go into detail in another chapter. One thing 

 is perhaps worth mentioning here, and that is, that the salmon 

 (Salmo salar), like the rest of the genus, has less than 14 rays in 

 its anal fin, while the salmon of the Pacific, the fish that is canned, 

 belongs to another genus, Oncorhynchus, distinguished by having 

 15 or 16 rays, and is really the quinnat (O. quinnat), known as 

 salmon for trade purposes. 



We may as well have this adipose dorsal assemblage in tabular 

 form : 



Two dorsals, second dorsal adipose 

 Anal extending to caudal Paralep is. 



Anal not extending to caudal 

 Anal with over 20 rays 



Anal in three portions of different heights Maurolicus. 

 Anal with under 20 rays 



Body ridged A rgentina. 



Body not ridged 



Dorsal rays over 18 Thymallus. 



Dorsal rays under 18 



Maxillary short Coregonus. 



Maxillary long 



Dorsal rays n Osmerus. 



Dorsal rays 12 to 15 Salmo. 



In sorting out the fishes with two ordinary dorsals, we will avail 

 ourselves of the barbules and pectoral filaments that are so con- 

 spicuous in a few. To the question as to what is a barbule, the best 



reply is a reference to the sketch of 

 the barbel's head (Fig. 14) ; for tho 

 barbel was named after the appendages 

 he wears, and on his account it is more 

 convenient to call them barbules, in 

 the old style, to save confusion between 

 the " little beard " and its wearer. Of 

 barbules, or barbels, then, it will be 

 tig. i 4 .-HEAD OF BARBEL. noticed tnat he has fourj two f rom the 



snout and two from the corners of his mouth. 



By the barbules, many and white, the octagonal body and the 

 absence of pectoral filaments, we distinguish the pogge (Agomu). 

 By the three pectoral filaments and the ridged body we know the 

 gurnards (Trigla), of which there are half a dozen species, T. gur- 

 nardus being the grey one. Of the five which are all red, more or 

 less, the piper, T. lyra, is known by the flat triangular plates over 

 the muzzle, which make it look as if it were divided, and the 

 lanthorn gurnard, T. obscura, is distinguished by the broad silvery 

 stripe which separates the red back from the white abdomen ; the 

 streaked gurnard, T. lineata, has lateral ridges that slope forward 

 from the back ; the red gurnard, T. cuculus, has a spiny ridge along 

 the base of the dorsals, and red fins ; and the sapphirine gurnard, 

 T. hirundo, has spines along the dorsals and large blue pectorals. 



