- ::^i7 - 



diam. , 2.8 nrni. ; length of hi:;ce, 5 mm. 



Remarks .- I'his species is "based upon a sinerle left valve. 

 Jhe I'adial sculpture is rather ;7ealc, weaker than inmost soeciet; 

 of the section Lima s. s.. The posterior suhmargin is imiisually 

 lop^. and so deeply impressed that it has a decided influence on 

 the outline; on the other hand, the anterior submaro-in is scarce- 

 ly' differentiate'; from the disk. 



The weak, narrow, sli^rhtly scahrous raclials and deeply im- 

 pressed, long posterior sxihmargin characterize this species. I. 

 tampaensis Dall fl), from the -^hipola of nillsbor-^^— '-. ''-I', "1"- 

 rida, is larger, with stronger radisls and a serrated base. 



Cl). Trans. "aR'ner J'ree Inst. Sci., Philadel'ohia^ vol. '^, it. 

 4, -0. 766, pi. ?5, fig. 18, 1898. 



Qgcurrence .- lower Kiocene : Bowdon be'''-S, Bowden, Jamaica. 



