303 



CHAPTER X. 

 Functions and Instincts. Cephalopods. 



WE have now taken leave of what may be called 

 the proper Molluscans, including the Bivalves, 

 and Univalves J of Aristotle and Linne, or the 

 Conchifers and Molluscans of Lamarck, and are 

 arrived at a Class remarkable, not only for their 

 organization, form and habits, but also for their 

 position in the animal kingdom ; for in their 

 composition they seem to include elements from 

 both the great divisions of that kingdom : from 

 the Vertebrates the beak, the eye, the tongue, 

 an organ for hearing, the crop, the gizzard, and 

 an analogue of the spine, with several other 

 parts enumerated by Cuvier ; and from their own 

 sub-kingdom, many of their remaining organs. 

 We may descend to the very basis of the animal 

 kingdom for the first draught of their nervous 

 system, for it is discoverable in the wheel-animals 

 in which Ehrenberg detected pharyngal gang- 

 lions and a nuchal nervous collar ; 2 the sucker- 



, Moro0U(Oa. 



2 Ganglia nervea pharyngea. Anmdvs nerveus michalis. 

 Ehren. 



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