- 3?. 7 - 



MYRTAx... ^i:OLA n. sp» 



De script ion .- Shell of medium sizp, tli'..., , .,..^^ .,. 1.., .,i. ^T , 

 sutiorbicular; anterior dorsal margin short, slifAtlj^ e::cavaterl, 

 upper portion of the anterior lateral marsrin obliquely truj-^catecl; 

 pop-^'^-r-im- rf,",roc,-i margin higher than the anterior, longer and 

 slightl^^" convex,, posterior lateral marn-in suhtruncated in the 

 region of the dorsal area; umhones "broad, lov/; Ituiule linear, mod- 

 eratel;.' i "^"■-'e'^^ed; anterior dorsal area poorlv define:., j^^osterior 

 area more prominent; external surface scnlptured with nuxaerous, 

 fine, unequally space- and often obsolete, weaklj' elevated con- 

 centric lines, becoming more prominent and sublamellose "- "^he 

 posterior area, between the concentric lines over the entire sur- 

 face of the shell obscure vermicular radial markin 'esent; 

 hirjge of left valve edentulous except ■^■^v a faint suggestion of 

 a single cardinal; rirht valve not known. 



Din^ensions .- "^ t., R4.5 mm.; alt,, S2.g mm.; semidiam. , 

 6.3 mm. 



Remarks .- I'his species is described from a single left 

 It is readily distinguished' from ]^, limoniana by its 

 mixch larger size, greater convexitv s.n -: 1«6S lar.ellar concentric 

 sculpture. 



Occurrence .- x-ower Eiocene : j^ '-en beds, Bo^vden, Jamaica. 



