- 25 5 - 



PKA0OIDS3 (OALLUOirA) SURUGOSTATUS n. sp. 



Sesorl i-'tion .- 3hell small, decidedly inflated^ suborTDicular ; 

 antero-dorsrl mar grin short, deeplj' excavated; posteriorly culstrun- 

 cated , proluoed and. roiiiided anteriorly; ui./ ' aid, ..arrow, relative- 

 ly hig-b; limnle :.te, deeply inroressed; dorsal areas o'bSGure; 



external surface scalptnred with rela"^ively rhoad _. ^ j radials 



and fine, closely and evenly spaced low, concentric lamellae, poor- 

 ly defined in the median dorsal region; left ynlve with two cardi- 

 nal; inner marpln of the valve with obscure fine crennlations and 

 broader tmditlations- the -undulations conforming to the external 

 radials and extending up toward the umbo posteriorly; right valve 

 not laio^Tn, 



I'i^gnsions .- lat., 8 can.; alt., 7,5 mn. ; semidiam. , 1.8 mm. 



?.emar>s . -. This sipecies is represented by one left valve. It 

 is disting-iishe'i? from the i-n-^n-^n- of -oaimeratus and its variety of the 

 same size by the greater conve: ity, deeper lunule and much broader, 

 more oronounced radials. 



Occurrence .- lower Lliocene: Bowden beds, Bowden, Jamaica. 



