S94 
SEA LAMPREY. 
in front are fixed in a single bone, wbicb is suspended from 
the skull; to which also the pair above the gullet are affixed. 
This bone forms a ring; but the rows above, or on the roof, 
stand, each tooth singly, on a bed of tendinous substance. 
Referring to what has been already said of the bones of the 
head, it should be added that the brain is small and not 
covered by them; and even the passage from the top of the 
head through an organized chamber to the gills is behind 
them; so that more probably they answer to the nasal and 
lachrymal bones of the higher animals, as appears to be Dr. 
Grant’s opinion in his Lectures. The animal senses of this 
fish appear to be acute. 
Mouth of Sea Lamprey seen fi-om above— to shew the crown of teeth, or 
tooth on the place of a tongue. 
