CONUS CONE. 61 



their generic character. You must first mention 

 to which of the three great classes they belong ; 

 next describe their general appearance ; and 

 lastly, the form and peculiarities in the aperture. 



* Genus-CONUS Plural, Coni. 



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 strise. 



LESSON XI. 



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 mollusks 

 belonging to these shells. I will relate to you all 

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



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

 fore the children ; they should learn it, and afterwards occa- 

 sionally repeat it. 



