DIPL0D0:,JA 



' L-1 xA n . s -0 . 



Descrl-ption .- Shell small, r ■ o ,-; r. -^ =-!- p i in flat eel, sli.i^htly 

 more produced and more eorwexlj? rounded antex-iorly ; umbonee rela- 

 tivelv low and inconspicuous; external surface soiilpttired v/ith fine, 

 close-tiot, ^-e'lilpf^ '--ori-entric striations; in'-°-^;'-^l cTmraoters nor- 

 mal • 



Dimensions .- lat., 6,2 nm. ; alt., C.S mm.; semidiara. , 1.5 mm. 



Her;ar>s.- In the '"^i? cession '^ f '^' >-■ '^'^- "^-"a '^i-olodontas Dall (l) 



(1). Trans. '.Tagner ^'ree Inst. Sci., Philadel-ohia, vol. .-, -ot. 



5, pp. 1182-11G5, 1900; pt. 6, p. 1507, '1903 (check listU 



has called this '^'-^^'^ies, -r-m- n>, Tc-represer. ' ^collections 



at hand "bj" two valves, D, suhc tl ad rat a ( Gab o ) '£)- rename-' gaho i 



). -.rarjs . Am, PV.ilos . 3og., 

 (as ITj'Bia suocniadrata) . 



■2, 187 ^^ 



by Dall i'^) tiiiice siVbciiiadrata "'at' 



In 18o5 ('!) 



f:^). loe. eit., p. 118 "■, fo'^t-note. 



(4), Proo. 2ool. SoG . London, p.. 230, 1855. 



