54 
fore, collected under this genus, of which I do not know that any 
have been found fossil. 
XI. Terebellum. A convoluted univalve, with an acute apex. The 
opening longitudinal, narrow upwards, notched at the base, and 
toothless. The columella truncated. 
Bulla terebellum of Linnaeus is also separated from the genus Bulla 
by Lamarck, who observes that it approaches nearer to Strombus 
than to Bulla ; it differing from the latter in the notch at the base of 
its opening, and by the columella being, as it were, truncated at its 
lower part, as in Strombi. 
A fossil shell of this genus is figured by Brander, Fossil, hauton. 
Tab. i. Fig. 29, a. and Tab. vi. Fig. as one of the Hampshire 
fossils, and named by Solander, Bulla sopita et volutata. It is a thin 
subcylindrical shell, with no spire. A shell of the same species, 
named by Lamarck Terebellum convolutum, is found in considerable 
number at Grignon ; and, notwithstanding their very fragile nature, 
many are found in a perfect state, proving that they must have lived 
in the region in which they are found. The recent analogue of this 
shell is not known. Another species, T. fusiforme, is also found in 
the environs of Paris. 
XII. Oliva. A subcylindrical univalve, notched at its base. The 
turns of the spire separated by a channel. The columella striated 
obliquely. 
The genus Voluta, of Linnaeus, comprehends many shells, the cha- 
racters of which certainly require their separation into other genera. 
This has been accomplished by Lamarck, with much care. Oliva is 
a genus which he found necessary thus to form, Linnaeus having con- 
sidered all the olives as only varieties of one species of volute, which 
he named Voluta oliva. 
Lamarck describes three species of this genus found in the neigh- 
bourhood of Paris : O. canalifera, 0. mitreola, and 0. Laumontiana. 
