[ 3i5 ] 
fwallowed. But the fhells of the fecond kind of 
food render fome degree of mafticating power 
neceffary, and accordingly we find in certain fifh 
a ftrudture fuited to this purpofe. 
Thusthe mouthof the woLF-FisHis almoft paved 
with teeth, by means of which he can break any 
fhells to pieces, and fo effectually difengage the 
food for digeftion, that though he lives upon fuch 
hard food, his ftomach does not differ from that 
of other fifh : the organs of mafiication and di- 
geftion therefore in this animal exactly correfpond 
to thofe of many granivorous quadrupeds. 
Other fifh, on the contrary, approach nearer 
to the ftruCture of birds, in having their ftomach 
furnifhed with fome degree of mafticating power; 
but it is very imperfeCt, compared with that of 
the gizzard of fowls, though perhaps the difference 
is fuch only as the difference of food will properly 
allow ; for in fifh who have this power, the food 
being ftill animal, and but imperfectly covered 
with the fhell, it perhaps wants only to be bro- 
ken ; whereas that of granivorous birds requires 
to be ground into a kind of meal. 
Of all the fifh I have feen, the mullet is the 
cleareft inftance of this ftruCture; its ftrong muf- 
cular ftomach being evidently adapted, like the 
gizzard of birds, to the two offices of maftication 
and digeftion. The ftomach of the fifh now be- 
fore us holds the fecond place. 
But ftill neither of thofe ftomachs can be juftly 
ranked as gizzards , fince they want fome of the moft 
effential characters, viz. a power and motion fitted 
for grinding, and the horney cuticle. The ftomach 
S f 2 Of 
