64 



CRENATULA ventricosa. 



TAB. CCCCXLlll. 



Spec. Char. Ovate, elongated, ventricoso- 

 carinated ; posterior side impressed ; beaks 

 pointed. 



Each valve approaches towards keelshaped iu 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 Bosworth ; 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 



