- 41f2 _ 



Desc- .- '" ^T ' '■' , -, •:v3.teli- 



inflate^; oerior ni ' , oroac"' ' , ' ' "' '■ riorl;-, 



base very ^-ently 3.TGneJ:e ^ ri- :erior raar,'];in . ," 



Kieetin?: the ^ostorio ■ in at an ann'le O"'' 00'"' nr rno'-e; 'Tih 



nari-OT/, n ' ' ; ^terior earina siodora'^el;' ctrori^-, : ■';- 



_•:'"^-..Ie" ounded; exterior siirfacG seulptr 



to tv/eiitr-on'. j.al ribs oi: 'jion o:^ the nheTT 



anterior to the cari . ' ' ' t to te: ^ ' ' ^ ' ' •; carina; inter- 

 spaces as vrid.Q as the ribs on the ce. ■f the shell, bpt nar- . 

 mwer in ' .jterior area and 1,:- . oyitrc - ^ - - egion; 

 the ribs bearing at relatively dista ' " '^ervci.ls '■ 'e or 

 rounded n' ' , bet :'.•■■- en v:hloh y ery '' ' : may 

 a'vnpar, th. ' .ers'oaces ovor, pp i b^" ?^hr>T-v^ ^i^rrr ^ ■eritri''' 

 ■ "evated lines; ixpper po.sterio-v ' ' ahe valve Tcebly serrate, 

 Dinensione .- Lat., 7.9 .; c.it., 8,1 mm.; semidiam., 2.i' 

 neraarlvS .- -.. nijj">'~''' ■'' ' -,.„.-i. ^ , ' pvpral -"'^i -^h 

 a^^ear to be adult, -^zr^.iS t':e h 3r th' .Jito. As usual, 

 the outer siu-face of hell is "ore the 

 r■l,■\n^^^^ ,->r^ ov-^i\ fine concentri''' ^--frv'^e -i" -'''"-' ''"'' ^- ^'^rely seen; 

 indeel, the ribs are usually much lispl ry fine 

 concentric striations that often i- in the inters-^iaoes 

 ■---tween the coarser raised lines. 



