402 



THE ANGLER-NATURALIST. 



CHAPTER XIII. 



Seriea II. CARTJLAOIN'OUS FISS*. 

 Order II. CHONDROPTEnTGII BRAN- 

 CBIIS FIXIS t. 



Family CTCLOSTOMATA J 

 Genus FETROMYZON ^. 



THE COMMON or SEA LAMPREY. 



(Petromyzon inarinus ||.) 



Characta-istics common to the Family of " Round-mouthed" Jish. — 

 No pectoral or ventral fins : body ending in a circular fleshy lip, with 

 a cartilaginous ring supporting it : no proper ribs or solid gill-arches, 

 and the vertebrae reduced to cartilaginous rays not readily distin- 

 guished from one another. Nostrils opened by a single orifice. In- 

 testine straight and narrow. 



The characteristics of the Lampreys as a genus are — 



* Chondropterygii, from Gr. chcmdros, cartilage, and j^te^ygion, a fin : 

 Fish without bones in their structure, (See p. 38.) 



t " Cartilaginous fish with fixed giUs." (See p. 38.) 



X Cyclostomata, " Round- or Sucking-mouthed fish," from Gr. cyclos, 

 a circle, and stoma, a mouth. 



§ Petromyzon, " Stone-sucker," from petros, a stone, and myzo, I 

 suck, Gr. II marinus, Lat., of the sea. 



