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. CCCCLXXVl'.— /g^. 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. 



r ULL 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 Suflfolk. 



NUCULA Lacryma. 



TAB. CCCCLXXVL— /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 



