- 579 - 



of this species differ deoide'ly in conve3:itj', the one, a. left 

 valve, TDeii-:ig 1.9 ran), in diameter, and the other, a rirrht, 1.2 

 mm. The shell is higher than v/ide, s''.i£htl^ ..lore produced anter- 

 iorly-, translucent, v/ith ohscure concentric lines toward the mar- 

 £-in and- the left anterior cardinal lar^e anr! '-nar'k:e''i-l:; oifid. 



_u. m^tiirella ib r^eogxiized hy itt :.xK;.til . ./.iell, 



nearly circiilar outline and minutely punctate surface. It also 

 occurs in the recent Vest Indian f°.vv.a» The Tampa silex form is 

 larger, m.ore orbicular with coarser ]_)LLac tation and oiooahly sho^-T' 

 he considered distinct. Among Gahb's Santo Domingian D, suhquad - 

 rata (l) is a Phlj-ctidernH that is very close to, if not identical 



with, puncturella, although it is smaller and less inflated. 



Occurrence .- lov/er I^iocene : Bow den beds, Bovvden, Jamaica 

 fDall, 1900, 1915). Recent: Jamaica, Porto laca and St* Thomas 

 fiJcll, 1915). 



