i8o OUTLINES OF ICHTHYOLOGY. 



Grayling. (^Thyviallus 'i-uh^iiris.) 

 Fresli ^\■atel• Herrings. {Corcgoiii.) 



(Four species or varieties.) 



Order III. 

 Soft-finncd Fish having lower arms. 



l"'amily i. Cod — G.vdid.e. 

 Species. 

 IJmbot, or Eel-pout. {Lota vn/gan's.) 



Order IV. 



Sflfi-Fiimcd Fish lacking ventral fins. 



Family i. Eels — MuR/ENID/E. 

 Species. 

 Sharp-nosed Eel. {Anginlla aciitiri'stris.) 

 Broad-nosed Eel. {Aiigiii/ia laiirosiris.) 

 Snig. {Angiiilla mcdiorostris. ) 



2ND Series. 



CARTILAGINOUS FISH. 



Order II. 



Fish with Fixfd GUIs. 



Family i. T^ish with mouth formed in a sucker. 



CVCLOSTOMATA. 



Species. 



Lamprey, or Sea Lamprey. {Pdiomyzflii inariniisi) 

 Lampern, or River Lamprey. iPctromyzimJliiviatilis.) 

 Fringed-lipped Lampern. [Pctroiiiyzpn P/ancri.) 



To give a practical example of this classifica- 

 tion : — The Common or River Perch is 2i species of 

 the gcfuts Pcrca, of the Fajnily of the Pcrcidcr, of 

 the Order Acanthroptcrygii, belonging to the True 

 or Bony series of fish ; or, in other words, is the 

 first .Species, of the first Genus, of the first Family, 

 of the first Order, of the first Series. 



