PETROMYZON. 71 



tude. To the eastward, at the mouths of some of 

 the rivers, in Maine, the marinus, even when fully 

 grown, does not exceed seventeen and twenty 

 inches. 



This fish may be designated, with certainty, by 

 its marbled, brownish skin, — possessing a silvery 

 shade towards the underside of the abdomen, — 

 and one dorsal fin, distinct from the second. In 

 the top of w^hat authors call the maxillary ring, 

 there are two large teeth. Though there may be 

 variations in color and size, in following the coast, 

 it may be distinguished by the other marks which 

 have been detailed. Within the inner side of the 

 jaws, and commencement of the fauces, are twen- 

 ty rows of fine teeth, and seven breathing holes on 

 the side of the neck. 



SALT WATER LAMPREY. 



All the lamprey's movements, strikingly resem- 

 ble those of the serpent, nor does their muscular 

 apparatus differ essentially from it. 



