MANUAL OF ZOOLOGY 



SECT. 



of either eight or ten long, highly extensile and contractile 

 appendages, the arms, the inner surfaces of which are beset 



Jaws irtf 



cart 



mant 



ruid> 



nuts 



manl '- 



FIG. 171. Nautilus. pompiliUS, diagrammatic lateral view of a female specimen 

 enclosed in its shell, cart, cartilage ; cten. ctenidia ; hd. hood ; inf. funnel ; 

 jaws, jaws ; mant. mantle ; mant . dorsal mantle fold overlapping the coil of the 

 shell ; mus. position of lateral mass of muscle ; nid. nidamental glands ; sept. 

 first septum ; siph. siphuncle. (After Keferstein.) 



with numerous suckers rendering them powerful grasping 

 organs. The arms are arranged in a circlet surrounding the 

 mouth. The posterior part of the foot appears to be repre- 



