- In? - 



left vglve is larger. Left valves in r)articnlar display a certain 



range of vcriation in convexity, the less conver fomis bavino- a 

 narrower cardinal area and m^re o"blioiie anterior teeth. 



Among the specimens v/as a left valve which was quite distinct 

 from the remainder in being more convex, in having a shorter post- 

 erior dorsal margin and therefore a more convex posterior lateral 

 margin, much higher and more incurved umbo and a wider cardinal 

 area. Unfortunately the shell v/as not complete and in handling 

 was irreparably broken. Tt is mentioned in the hope that future 

 exploration will reveal its presence. 



The most closely related forms are, as noted above, recent 

 srjecies. 



Occur re nce .-iorer Miocene: Bowden bC'-^-s, Bowden, Jamaica. 

 (Ball, 1898). 



