64 LESSON X. 







* GENUS CONUS. 

 CONE. 



Generic character. Shell univalve ; whorls 

 spirally convoluted, spire retuse ; form inversely 

 conical, turbinate ; aperture linear, longitudinal, 

 entire, effuse at the base ; columellar lip smooth, 

 sometimes marked at the base with a few oblique 

 rugose striae. 



LESSON X. 

 REMARKS ON THE SHELL AND ITS INHABITANT. 



Teacher. The genus conus is very easily 

 known by its conical form and smooth columel- 

 lar lip ; these may be considered its two distin- 

 guishing characters. Much has not been dis- 

 covered of the history or habits of the mollusca 

 belonging to these shells. I will relate to you 

 all the facts that I have been able to collect, and 

 you must give your undivided attention to what 

 I say, in order that you may afterwards write 

 down the account from recollection. 



The animal inhabiting the shells belonging to 



* The generic character should be written on the slate before the 

 children ; they should learn it-, and afterwards occasionally re- 

 peat it. 



