119 
Marchioness of Bath, who obtained it from the Alum- 
works of Lord Dundas, near Whitby. The stone in 
which the shells are imbedded is very hard. 
NUCULA claviformis. 
TAB. CCCCLXXYI. —Jig. 2. 
Spec. Char. Ventricose, concentrically sulcated ; 
anterior side rounded ; posterior much pro- 
duced, attenuated ; upon the posterior slope 
is a broad concave area, bounded by two 
ridges that run from the beaks to the anterior 
extremity ; sulci fine. 
Full twice as wide as long ; the attenuated extremity 
is curved a little upwards and truncated ; upon its upper 
part is a broad space rather concave and bounded by 
two obtuse ridges. 
The specimen figured is from Northamptonshire : it 
has also been met with in rounded masses of gray Lime- 
stone in the alluvial deposits so common in many parts 
of Norfolk and Suffolk. 
NUCULA Lacryma. 
TAB. CCCCLXXVI.— /g. 3. 
Spec. Char. Ovate, gibbose, smooth ; anterior 
side produced, pointed, convex above; pos- 
terior side rounded. 
About twice as wide as long, much resembling the last 
in form, but not sulcated, and otherways distinguished 
by the shape of the produced portion. The size and 
