CON US CONE. 61 



the Cones, and thus draw out their generic char- 

 acter. You must first mention to which of the 

 three great classes they belong ; next their 

 general appearance ; and lastly, the form and 

 peculiarities in the aperture. 



* Genus CONUS Plural, Coni. 



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 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 



The generic character should be written on the slate be- 

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

 sionally repeat it. 



