64 
CREN ATULA ventricosa. 
TAB. CCCCXLIil. 
Spec. Char. Ovate, elongated, ventricoso- 
carinated ; posterior side impressed ; beaks 
pointed. 
Each valve approaches towards keelshaped in con- 
sequence of its great depth and the flatness of the pos- 
terior side, which is also nearly straight; near the beaks 
the posterior edges are a little produced, but not enough 
to form a lobe ; the front is rounded as well as the an- 
terior side ; hinge line short. 
There are but 5 or 6 crenulae of the hinge remaining 
in the specimens before us, but they are perfect enough 
to shew the characters of Crenatula, although the shell 
is much more gibbose than any known recent species. 
The one figured came from Husband Bos worth ; it was 
lent Mr. Sowerby by the Rev. W. D. Conybeare : at 
one end of it is a young individual. Another specimen 
from Bennall or Barnall Wood, near Gloucester, shews 
the internal pearly coat ; it was presented by Miss 
Warne 
