- 192 - 



and since the BoT^den fornis so closely resemble t'^e recent ones 

 it is natural to acoe'Qt with some hesitanoi^ this ., -. ^en, pronouji- 

 cei extension of range. 3}he s\zg~estion has "been made that these 

 S">oeci-'-'.ens are recent shells which have been washer" n>o on the heach 

 v/here the Borden he^^s are exposed, hut such a view uan hardl;,- be 

 entertained since in color and te'ture these oysters are similar 

 to the other Boc^den shells. 



It is extremely doubtf^il whether this s;pecies is genetlQally 

 valid, since it may merely include forms which are abnormal because 

 of situs. The Bowden forms, howcvr.r, are constant in the "oof'sess- 

 ion of numberous, small, but sharp, marr-inal plications. The pli- 

 cations of haitensis are lar^-er, sharper, fewer in number and ex- 

 tend ^urtVer tovrard the nmbo, -.vhile the folds on me^'0^0j\ ere "ewer 

 and broader; besides, foliian is more elongate than haitensis . of the 

 sane size and narrower and m.ore cojivex thsji the non- falcate forms 

 of me^ndTfi. The claspirjg processes were devel nop ' n. " ' r the 



"^ was attached, r>resumably to a root or so::.e other object, 

 li':e the recent forms. In general the elongate, usually swollen 

 form : " • -;ipr-iiif' -r-ivc-i-ftpi -^lications characterize ■^hiR f^nf^nVs 

 8.S here considered. 



0. frons is placed in synonymy, although its pli is are 

 acxTtely angular and th^^ r^-ell is usually e -^j^'^1'"='1- ,^ to nr—n* .-;,-• . 

 .ansrck'fj "- •■ ... 'ed shells. 



