THE PEARLY NAUTILUS. 



179 



each eye. These consist of a series of compressed 

 circular discs affixed to a lateral stem. In addition to 

 this tentacular apparatus, is a series of oral appen- 

 dages ; four labial processes are situated around the 

 lip which encloses the beak, and each of these is pierced 



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Tentacula of Cuttle-fish. 



by twelve canals, the orifices of which are disposed in 

 a single but rather irregular row along its anterior 

 margin ; these canals contain each a small tentacle, 

 similar in structure to those sheathed in the processes 



