- ^1 



Remarks .- Sevex'al valves of t?iis species are at hand, the 

 larp-est beiiio- larger than the t x . The high, triffo.'^al oiitline 

 an^ relati -ely stron?? i -f 1 ation re the flis tin =m shin;? features. 

 Toward the margin faint sag:?-estio. s of radial myrkin'^s are occas- 

 ionallr visible; they '^o not, however, rise above the reneral 

 siarface of the shell. 



Occurrenie .- lower Miocene: Sowden berls, Bowden, Jamaica 

 (Dall, 1900). 



