364 LINNiEAN ARRANGEMENT 



them immediately under the Pectoral, are named Tho- 

 racic : and such as have them behind or beyond the Pec- 

 toral, are named Abdominal. 



As the ensuing descriptions of the Fish, are placed 

 according to their Scientific order, and not according 

 to that of their occurrence in the preceding work, a 

 reference to the Chapter and the page in which they are 

 treated of and represented, is placed against each of the 



following Articles. 



ORDER I. 



Apodal, or Footless. 



No Ventral Fins. 



Genus Anguilla, Eel. 



Head smooth. Nostrils tubular. Eyes covered by the 

 common skin. Gill-Membrane 10 rayed. Body roundish, 

 smooth, mucous. Dorsal, Caudal, and Anal fins, united. 

 Spiracles behind the head or Pectoral fins. 



A. vulgaris. Common Eel. Chap. xm. page 193. 



Olive-brown Eel, subargenteous beneath, with the lower 

 jaw longer than the upper. 



ORDER II. 



Jugular. 



Ventral Fins before the Pectoral. 



No example. 



ORDER III. 



Thoracic. 



Ventral Fins under the Pectoral. 



Genus Cottus, Bull-Head. 



Head broader than the body, spiny. Eyes vertical, and 

 furnished with a nictitating membrane. Gill-membrane 

 6 rayed. Body (in most species), without scales, atte- 

 nuated towards the tail. Dorsal Fins (in most species), two. 



C. Gobio, River Bull-Head. Chap. xvm. pages 230, 232. 

 Smooth yellowish-olive Bull-Head, variegated with black ; 

 beneath whitish. The Head furnished with a spine on 

 each side. 



Genus Perca, Perch. 



Teeth sharp, incurvate. Gill-covers triphyllous, (three- 



