57 



distinguish these shells from the volutes. Lamarck describes thirteen 

 fossil mitres as having been found in the neighbourhood of Paris : M. cre- 

 bricosta, M. monodonta, M. marginata, M. plicatella, M. labratula, M. mixta, 

 M. cmcellma, M. terebellum, M. fusellina, M. graniformis, M. mutica, 

 M. el'ongata, and M. Cithardla. 



XVI. Columbella. An oval univalve, with a short spire; the base of 

 the opening more or less notched, and without canal. A swelling on 

 the inner part of the right side. Folds, or teeth, on the columella. 



This genus is exemplified in Voluta mercatoria, Lin. List. Condi, 

 t. 824, /. 23. No shells of this genus have been found fossil by La- 

 marck, nor am I aware of any having been found in this island. 



XVII. Margindla. An ovate-oblong, smooth, univalve, with a short 

 spire. The lip thickly marginated on the outside. The base of the 

 opening but slightly notched ; the columella plicated. 



Lamarck particularizes three fossil species : M. eburnea, M. dent if era, 

 M. ovulata. Plate V. Fig. 14, represents M. eburnea, from Grignon. 

 I am not aware of any of this genus having been found fossil in 

 England. 



XVIII. Cancdlaria. An ovate or subturrated univalve, with the lip 

 sulcated internally. The base of the opening slightly channeled ; and, 

 in some, almost entire. Sharp, but compressed plicae, on the columella. 



The compressed, but sharp plica?, on the columella, distinguish these 

 shells from those of Nassa and Purpura ; whilst the corrugated lip detaches 

 them from the mitra, marginella, &c. 



Plate V. Fig. 8, represents a very interesting shell of this genus, from 

 Courtagnoh. An ovate shell, with a long spire; with thick angulated 

 ribs, muricated about their centre, and divided by fine transverse striae ; 

 the columella with three plicae; the opening nearly entire, being con- 

 tracted rather than notched at its base. 



The observations made by Lamarck on another species of this genus, 

 C. volutdla, a turreted varicose shell, having numerous longitudinal ribs, 

 with nearly obsolete transverse striae, and a short, scarcely notched, tail, 

 in a great measure apply to the shell here figured. This shell, he says, 



VOL. III. I 



