57 
fossil mitres as having been found in the neighbourhood of Paris : M. 
crebricosta, 3C. monodonta, 31. marginata, 31. plicatella, 31. labra- 
tula, 31. mixta, 31. cancellina, 31. terehellum, 31. fusellina, 31. 
graniformis, 31. mutica, 31. elongata, and M. citharella. 
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. Conch. 
Tab. 824, Fig. 23. No shells of this genus have been found fossil by 
Lamarck, nor am I aAvare of any having been found in this island. 
XVII. Marginella. 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. dentifera, 
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. Cancellaria. 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 plicae, on the columella, distinguish these 
shells from those of JVassa and Purpura ; whilst the corrugated lip 
detaches them from the mitrce, marginellce, &c. 
Plate V. Fig. 8, represents a very interesting shell of this genus, 
from Courtagnon. 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 plica ; the opening nearly 
entire, being contracted rather than notched at its base. 
The observations made by Lamarck on another species of this genus, 
C. volute l la, a turreted varicose shell, having numerous longitudinal 
ribs, with nearly obsolete transverse stria, and a short, scarcely 
notched, tail, in a great measure apply to the shell here figured. 
VOL. III. 
I 
