156 



SALMONID^ OF BRITAIN. 



turned outwards alternately to the right and to the left, being the remains of a 

 double row that existed here when younger, but with increasing age the dental 

 ridge became narrowed and some teeth have fallen out, as remarked on at 

 p. 21. The assertion of Dr. Giinther respecting the head of this bone being tooth- 

 less is possibly a misprint, as it rarely if ever is so naturally in specimens under 

 twenty inches in length, while teeth are often present there in examples exceeding 

 this size. 



These figures of 

 the vomer in this 

 fish are in No. 1 of 

 a female herling or 

 whitling from the 

 Esk, at Carlisle, 8-2 

 in. in length, head 5^ 

 in the total length, 

 the fish having 43 

 csecal appendages , 

 and 57 +x vertebrae ; 

 some of the teeth 

 have already dropped 

 out, but the remains 

 of a double row 

 along the body of the 



Fig. 29. Vomer and its teeth from 

 1, whitling, 8'1 inches long, shown 

 twice natural size; 2, from salmon- 

 trout, 17 inches long, from the Oykell, 

 natural size ; 3, from salmon-trout, 16 

 inches long, from the Teifch. 



vomer is apparent. 

 No. 2 is the vomer of 

 a salmon-trout frora 

 the Oykell, 17 in. 

 long, having 57 + x 

 vertebrae, and show- 

 ing more teeth along 

 the body of the 

 vomer than is usual 

 in a fish of this size. 

 No. 3 is a salmon- 

 trout from the Teith, 

 16 in. long, with 52 

 caecal appendages 

 and 58-^-0! vertebrae. 

 Although it has two 



teeth along the hind edge of the head of the vomer it only possesses three along 

 its body. The teeth in the jaws and palatines are in a single row. Three to 

 six strong, sharp recurved ones exist on either side of the tongue. Fins — in 

 large examples the fins are comparatively shorter than in smaller ones, and the 

 pectoral rarely extends half-way to the base of the ventral, which latter is situated 



Fig. 30. Outlines of tail-fins of various sea trout. 1. female whitling, 

 8'1 inches long : 2. truff, 8-2 inches long : 3. male whitling, 11 inches long : 

 4. female salmon-JroKt, from the Teith, 12'3inoheslong: 5. female scjcm, 15 inches 

 long: 6. female 8ctM/, 16-6 inches long: 7. satoon-tro«« from the Oykell, 17 inches 

 long : 8. male salmon-trout from the Teith, 20 inches long. The foregoing tail fins 

 aie expanded to twice the depth of the free portion of the tail as shown in p. 14. 



