166 
this character is generally prominent in young shells, 
although it frequently occurs in the largest specimens, 
especially those of Hampshire, which exceed the French 
ones in sizé. The var. y is intermediate between « and 0d; 
the upper parts of its volutions are rather concave, but 
the body is not flattened, neither is there a distinct. 
thickening of the shell to form a ridge as in ?: this is 
the most common variety in France. The plaits inside 
the right lip that characterize the first of La Marck’s 
varieties are sometimes found in all the others, most 
commonly in young individuals whose shells have not 
acquired considerable thickness. 
So numerous are the remains of this Fusus in the clay 
of Hordwell, and the New Forest in Hampshire, that 
I might add a long list of friends to whom I am indebt- 
ed for specimens were it necessary, but its localities 
are already well established. It appears to be equally 
abundant in the analogous formation in France. It is 
liable to much variation in form, and in an extensive 
collection it would be difficult to draw a line between the 
several varieties, a circumstance that proves La Marck 
to be correct in associating Brander’s two species to- 
gether. ‘The surface is liable also to some variation in 
degree of smoothness, some shells being striated irregu- 
larly all over, while others are only striated near the 
beak, and some indeed are wholly smooth. The outer 
surface is generally dull, the inside often beautifully 
polished. The figures of the several varieties are num- 
bered upon the plate as follows. 
Fig. 1, Young shell of var. y. Fig. 2, Young shell 
of var. 6, Fig. 4, different views of two specimens of 
var. «. Fig. 5 var. y, Fig. 6. var. 3, a large specimen 
from the collection of Miss Dent. 
