SORTATION. 



43 



the anal fin. The ventral fins, otherwise the pelvics, are supported 

 by the pubic bone, and the pectorals are connected with the 

 scapular arch, consisting of the supra-scapular, the scapular, and 

 the coracoid, which join on the head. 



The head we have intentionally left to the last, and we will be 

 content with an outline of that of the perch, mentioning only a few 



Fig. 24. PREMAXILLARY, MAXILLARY, AND DENTARY OF SALMON. 



of the parts, and advising those who would know more to make 

 acquaintance with some of the beautiful mounted specimens in 

 most museums, where the many parts do not blend into the mass 

 as they do in diagrams. 



In the region of the mouth (Fig. 23) we have the premaxillary 

 and maxillary, and, in the lower jaw, the mandible, along which, 

 carrying the teeth, is the dentary, A fish's teeth may be all over 

 its mouth, not only on its jawbones, but on the bones of its palate 

 and its pharynx, and even on its tongue-bones and tongue, which 

 tongue is not free in its movements, but moves only as part of the 

 hyoid apparatus. The curious way in which the teeth may cluster 

 on the bones is well shown in the salmon, which has teeth on the 



Fig. 25. GILL ARCHES. 



dentary, the premaxillary, the maxillary, the palatines, and also the 

 vomer, which is the bone placed in the middle of the mouth (Fig. 24). 



