AMMONITE. NAUTILUS. lUO 



its shells being many-chambered. Two or three 

 fossil species have been found in London clay. 



" Among the various fossil-shells abounding 

 in different strata, not known in a recent state, the 

 one most remarkable and frequently occurring is 

 the Ammonite, Cornu Ammdnis, so called from 

 the resemblance it bears to the convoluted horns 

 of Jupiter Ammon, in mythological history. 

 This is your snake-stone, Lucy, a local name, 

 which you had better change for Ammonite. 

 Various legends are connected with this fossil, of 

 which you may obtain information by consulting 

 the before-mentioned publication. 



" As you are desirous of studying geology, a 

 knowledge of the Ammonites is very requisite, 

 since whole sections of the genus are characteristic 

 of certain strata. 



" They are nearly allied to the Nautilus, 

 The species are very numerous; one hundred and 

 twenty according to some authors — two hundred 

 and seventy species are enumerated by others. 

 They occur in Europe, Asia, and America : they 

 have been found in the chalk with a diameter of 

 three feet. 



" In the second division of this order the genus 

 Argonauta occurs : the shell has been already de- 

 scribed, and retains its original name. (Plate 6.) 



" In the tliird division is the family Sepiaria^ 

 containing Octopus, LoUgo, and Sepia. This 



