teeth ; and it is a beautiful illustration of the 

 various means by which nature sometimes at- 

 tains the same end, that to some similar animals, 

 as the great marine worm, she has given actual 

 teeth, situated in both the stomach and gullet, for 

 this purpose. The stomach of the cuttle is fur- 

 nished also with a spiral-shaped appendage, into 

 which the bile is discharged from the liver. What 

 is called the ink of the cuttle, generally, but erro- 

 neously, supposed to be the bile of the animal, 

 arid the chief ingredient, probably, in the com- 

 mon paint called Indian or China ink, is the 

 product of a little pouch in the course of the in- 

 testinal canal, and of use in staining the water, 

 and thus concealing the animal, when about to 

 be preyed upon without any means of defence. 

 With how obvious a design here, has nature 

 compensated to the cuttle for the want of those 

 prickles with which she has defended the surface 

 of the sea-urchin ! 



The digestive apparatus of the leech is re- 

 markable, principally, for a strong fleshy pharynx, 

 or bag immediately behind the mouth, which, as 

 I have already said, is its chief instrument in 

 sucking the blood of other animals, and the long 

 and capacious stomach, which is divided into se- 

 veral large cells, communicating with each other 

 by oval apertures. It is through these that the 

 blood is forced back again, when the voracious 

 creature is made to regorge its disgusting meal. 



In insects, the structure of the digestive appa- 

 ratus is in general still more perfect than in the 



