418 Natural History of Molluscous Animals : — 



but capable of being unrolled to a slight extent, and having 

 its surface roughened with many rows of small sharply pointed 

 tricuspidate, or semi-tricuspidate teeth, set in close and regular 

 array, which can be erected at will, so as in some measure to 

 grate down the food, previously to its transmission to the 

 gizzard, and they greatly facilitate its descent by their direction, 

 and by their motion backwards and forwards. In the mouth, 

 the food is mixed with the saliva, which is secreted by one or 

 two pairs of large glands. The gullet is a narrow membra- 

 nous tube, of nearly uniform calibre throughout in the Zoligo 



The stomach of Zollgo vulgaris. 



(Jig. 55y 56, a), and penetrating the substance of the liver be- 

 fore it enters the gizzard ; but, in the Octopus, the gullet is 

 only bound to the surface of the liver, and at the point of 



