OF THE FISH. 365 



leaved) scaly, serrated. Dorsal fin spiny on the fore part 

 Scales (in most species), hard and rough. 



P. Fluviatilis, Common Perch. Chap. xn. page 183. 



Olivaceous Perch, with transverse semi-decurrent blackish 

 bands. Dorsal fin subviolaceous, the rest red. 

 P. Cernua, Ruffe-Perch. Chap. xv. page 204. 



Sub-olivaceous Perch speckled with black, with 15 spines 

 in the Dorsal fin. 



N.B. The large Eyes (Oculi magni), which are no- 

 ticed in Linmeus's description, are well expressed in 

 the Plate. 

 Genus Gasterosteus, Stickleback. 



Body somewhat lengthened. Dorsal Spines distinct. Ventral 

 fins spiny. Abdomen carinated on the sides, and bony 

 beneath. 



G. Aculeatus, Common Stickleback. Chap. xvm. pp. 230, 

 233. Olivaceous Stickleback, silvery-red beneath, with 

 3 Dorsal spines. 



ORDER IV. 

 Abdominal. 

 Ventral Fins behind, or beyond the Pectoral. 

 Genus Cobitis, Loche. 



Mouth (in most species), bearded. Eyes situated in the 

 upper part of the head. Body nearly of equal thickness, 

 from head to tail. Scales small, easily deciduous. Air- 

 bladder hard, or osseous. 

 C. Barbatula, Common Loche. Chap. xvm. pp. 230, 231. 



Yellow-gray Loche, with dusky variegations, small com- 

 pressed head and C beards. 

 Genus Salmo, Salmon. 



Head compressed, smooth. Tongue cartilaginous. Teeth, 

 both in the jaws, and on the tongue. Gill-membrane 

 from 4 to 10 rayed. Body compressed, furnished at the 

 hind part with an Adipose fin. 

 S. Salar, Common Salmon. Chap. VII. page 138. 



Silvery-gray spotted Salmon, with the jaws (in the male) 

 incurvated. 



5. Fario, Common Trout. Chap. v. page 83. 



Yellowish-gray Salmon with red spots, and lower jaw 

 rather longer than the upper. 



