91 



This shell occurs in the lower bed at Bradford Abbas. 



This is one of the most abundant species at Bradford, occurr- 

 ing towards the base of the I. Oolite rock not far above the 

 sands. Shells with double valves are uncommon, not so single 

 valves. 



ASTARTE (OPIS) LUNULATA. FIG. 17. 



Sow, M.C., t. 232. 



"Spec. Char. Ehomboidal, pointed, gibbose transversely 

 costated ; anterior part separated by a projecting serrated keel; 

 lunule deeply excavated; beaks involute."^' 



Proportions: Length, 10 lines; breadth, 9; depth 9. 



This shell occurs at Bradford Abbas quarry, but is rare. 



Fig. 17, A. fOpisJ hmidata. 



ASTARTE (OPIs) ANGULATA. J. B., F. 18. 



Spec. Character ; obliquely triangular, posterior slightly gib- 

 bose, anterior flattened with a raised ridge at the junction of the 

 valves, beaks incurved, lunule very small and superficial, whole 

 shell sharply ribbed. 



Proportions : Length, 9 lines; breadth, 6 lines; depth, 5 lines. 



This shell differs from A. trigoiialis in its small lunule, which 

 is larger and heart-shaped in trigonalis, and from the A, 

 lunidata, which possesses a lunulate and very deep lunule. 

 * Sow, Mill, Couch, vol. iii., page 55. 



