,^60 - 



PilAOOI.DiS (PA:r7ILU0i'.i. ) LIMKLIi/U3 n. sp. 



Description .- Shell small, sub orbicular, dcoidedly inflated; 

 more evenl;: rounded anteriorly?; umbo tixmid, high, broad; lunule 

 relatively large and rleeply ir-pressed; dorsal areas poorly defined; 

 external surface sculpture'-'' '"Ith numerous, vzealc, narrow radlals, 

 separated by interspaces of about the same width and crossed by 

 irregularly disposed concentric wrinltles and low lamellae; hinge 

 with a single cardinal and the laterals, the posterior more elon- 

 gated and comoressed; inner margin of the valve weakly crenulated. 

 Dimensions. - lat,, 5.5 mm.; alt., 5.5 mm.; semidiara. , 2 mm, 

 ?.erna r]: s . - This species is described from a single valve. 

 The siiBll convex forms discussed imdcr the preceeding species are 

 intermediate between -oroteidus and linneidTis ; from these varieties 

 limneidus differs by its greater convexity, more tumid and high- 

 umbo, slightly coarser sculpture, larger and deeper lunule. 







ccurrence.- Lower Kiocene: Bowden beds, Bowden, Jamaica. 



