316 



SHELLS AND SHELL-FISH. 



PART II. 



it forms a short internal channel ; operculum ear- 

 shaped. 



nodulosum. En. Me"th. 442. tuberculatum. Mart. 157. 

 f. 3. f. 1490. 



FAMILY 4. VOLUTID^. 



Shell destitute of a channel j the base truncated and 

 notched ; the pillar marked with folds or plaits ; oper- 

 culum none. 



SUB-FAM. 1. VOLUTIN^:. True Volutes. 



Spire shorter than the aperture, which is never striated; 

 pillar with distinct plaits., the upper ones the shortest ; 

 tip of the spire papillary.* (fig. 81.) 



VOLUTA Linn. Shell large, ventricose ; the spire ex- 

 tremely short, very obtuse, and papillary ; the ter- 

 minal whorls, where they exist, being smooth and 

 un sculptured. 

 1. Turbinelliform type. Shell melon- shaped; spire very 



* Except in Volutilithes, 'which wants the three last characters, the 

 plaits.being faint, the tip of the spire acute, and the lower plaits the longest. 



