48 REPORT OF NEW JERSEY STATE MUSEUM. 



Class CYCL05T0MES. 



The Lampreys. "^ 



Naked eel-shaped animals, known by the absence of jaws, limbs 

 and ribs, also without coat-of-mail, and by the presence of a 

 brain. 



Family PETROMYZONIDZE. 



The True Lampreys. 



Body compressed behind. Eyes well developed in adult, rudi- 

 mentary in young. Mouth partly inferior, disk-like and formed 

 for sucking. Lips, fringed. Horny teeth in adult resting on 

 papillse in mouth, though in young toothless. Nostril on top of 

 head close in front of eyes. Intestine with spiral valve. Eggs 

 small. Dorsal fin somewhat notched. 



Found attached by means of the sucker-like mouth to other 

 fishes on which they feed by scraping off the flesh with their 

 horny teeth. Ascending streams in the spring to spawn. 



Genus Petromyzon Linnaeus. 



The Lampreys. 



Petromyzon marinus Linnaeus. 



Lamprey. Sea Lamprey. Lamper Eel. River Lamprey. Green 

 Lamprey. Shad Lamprey. Nine Eyes. 



Head, to first gill opening, 9; depth 11. Body elongate with 

 trunk compressed. A median ridge down back to dorsal. Head 

 broad. Snout long. Eye circular, w-ithout lids, and a little less 

 than last third in space between tip of snout and first gill-opening. 

 Mouth large and with fringed lips. Teeth conic, placed in 

 oblique series with innermost largest and superior of which are 



