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PEGTEII (JKLAir/S) Ij"EA1,:01"IPKU3 n. sp. 



Description .- Shell anall, thin, moderately? inflated, higher 

 than v;ide, the dorsal marsrins slor)i:'" steeply?; e-- ternal surface 

 soulptirred vrith about t\7enty-three narrovv, prominent, rounded, un- 

 equally spaced radial rihs of inconstant width, some extending 

 only, a little more than half of the distance to the ixmbo and all 

 ■becoming obsolete before the u.mbo is reached; the ribs finely/ nod- 

 ulated along irregularly spaced concentric lines; auricles unenual, 

 with relatively prominent ra-'iisls roughened by overriding concen- 

 tric lines; byssal notch prominent. 



Dimensions .- lat. 4 mm.; alt., 5 mm.; diam., .5 mm. 

 Remarlcs .- "^Ithough the single right valve on vvhich this 

 species is based is doubtless very young, the narrow, irregularly 

 spaced and nodulated radials definitely distinguish it from the 

 other mem.bers of the section. 



OoQurrenoe *- j^or/er Iliocene: Bo\"den beds, Bowderi, Jamaica. 



