- P"54 - 



PHAOOIDES (GALLUGirA) PATTP^II^ATTJS ' var . OLIGOGOSTAruS n. var. 



Desoi-jption .- Shell resembling the t^-pical pauperatus . but 

 more ror-nr^ed, Ti.'3'u.all37 more inflated, especially' toward the margins; 

 xjinbones tending to be slightly higher; dorsal areas less well 

 define'; radial sciilptixre weak or obsolete; concentric sculpture 

 coarser, heavier, more regular and ^resent over the entire disk. 



Sir-, en si Oils .- lat. 17.8 mm.; alt., 16.8 mm.; semidiam. , 4.5 mm, 

 P.emarVs .- This variety is proposed for a number of valves, 

 that are conspiciioxis becap.se of the their prominent concentric 

 sculpture. Variation affects the convexity and the outline, some 

 of the specimens having a longer anterior dorsal margin and a 

 proportionately greater v.'idth than the t;-oe. ..'hen compared with 

 the typical pauper.g.ta . tbese valves form a rather corapa'?t groap, 

 the most obvious difference lying in the coarseness and prominene 

 of the concentric scr.lpture of the variety. P. radians (Gonrad ] (1) 

 is separated by its narrower umbones, longer anterior dorsal raa.r- 



(1). discussed above. 



gin and stronger hir^e. 



Occurrence .-- lower lliocene : 3owden,beds, Bowden, Jamaica. 



