24 
Arragon, and in the sandy hills of Tuscany . Thus we have 
something by which to make a comparison as far as relates 
to similarity of formation. It is found either in the dark 
clay, or in the more sandy soil among it, at Highgate* 
The upper figures show the front and dorsal view of the 
shell. The middle figure is an internal cast, being yellowish 
Carbonate of Lime, showing the polished inside of the shell, 
which was filled with Indurated Clay and Pyrites; a little of 
the shell remains in a chalky state on some parts. It is always 
worth while attending to the casts of shells, as in some forma- 
tions they only remain, and we may by practice learn to 
what shell they belong, which may prove abundantly useful. 
I have a small broken specimen, in which the inner lip is 
much spread, and having only one distinct row of projections 
on the edge of the more ventricose part, and the striae are 
finer ; perhaps it is a younger shell ; it is filled with sandy 
clay. Also from High gate. 
CASSIS striata* 
TAB. VI . — Four lower figures . 
Spec. Char. Shell ovate; spire acute; volutions 
oval, longitudinally striated, with one obscure 
nodose ridge; beak nearly straight. 
Spire short, rather acute, volutions about six, covered with 
rising longitudinal striae, -which are all equal, except one 
close to the upper edge, and one between that and the nodose 
ridge, which are more prominent. Lines of growth indis- 
tinct. Mouth oblong, right lip reflected, broad, flat, toothed 
within ; left lip broad, plicate, passing over the umbilicus 
