38 
From the Chalk at Lewes; the two specimens here 
figured differ from each other in the number of plaits, and 
slightly in shape, but we do not know how to consider 
them as distinct species: this and the last are nearly 
related to T. concinna t. 83. fig. 6. 
TEREBRATULA. Wilsoni. 
TAB. CXVIII.---Fig. 3. 
Spec. Cuar. Circular, plaited; front cylindri- 
cal, margin acutely dentated, elevated in 
the middle with seven plaits; nine or ten 
plaits on each side ; valves compressed towards 
the beaks. 
ncn asia 
Tue front of this shell is placed at a right angle to the 
beaked valve, and is nearly of the same length: the re- 
maining parts of both valves are slightly convex: the 
form of the shell is therefore a cylinder cut off obliquely 
at one end, and rounded: the sinus at the front, although 
very deep, does not alter the evenness of the surface. 
This is from Mordiford, E.S.E. of Hereford, by favour 
of Lady Wilson: the structure is curiously different from 
any I have otherwise seen. I have the honour of naming 
it after her Ladyship, in commemoration of her zeal for 
research in this science. The specimens have some of the 
shell remaining; and are filled with a darkish limestone. 
