YOLDIA. 



seiiiilunar; anterior side ]iroduced, dorsal margin 



L'onvexly sloped. 

 Cm riio\. -lay's Catalogue of Shells. 

 nab. Slictland Islands. 



Species -27. (Mus. ? copied.) 



Y()Ll)i.\ SULCIFERA. Yot. testd inwi'd, stramined, suh- 

 oL-atd, costellis pavcis mtunrlin covrrntriris liratd : 

 lotere posiico acwnituiin. >iiiin/iiii' rjorsali i/i'presso, 

 area kevigatd ; latere tmlira i-uiiiiiJu. 

 'I'm i.cnovEl) YoLDl.'i. Shell small, straw-coloured, 

 -iiliovate, ridged with lew rounded concentric 

 rilis; jiosterior side acuminated, dorsal margin 

 (Iciiri'sscd. area smooth : anterior .side rounded. 



Kki.m. 1 



llah. 



This 

 any spec 



Vov; 



ige. p. 



es iH. ( Mns 

 Y„l. trstd or,,. 



Deka 



YoLiiiA (idin.iui. Ye/. Iistd oriito-fiihlriiiniu), stramined, 



lata, bi-ici, fiiliiTi/iiiliih i-iili. tjiiiiiUr raiiceiitrice 



I riKjutd ; lati'n- postiii' uiniiihiti), run, uto. and post- 



arij/iihiri aiiijiistd, dccliri , luti'rr itntivo /ir, ri, inib- 



rotundo, margine dorsall snlirainTiVd. 



Gould's Y'oldi.^. Shell ovate-subtrigonal, straw- 

 coloured, broad, short, sube(iuilateral, finely con- 

 centi-ically wrinkled; posterior side angular, 

 cuneate, postangular area narrow, sloped, rather 

 rounded, dorsal margin rather concave. 



Dekay. (Nucitla) New York Mollusca, ]>. KSd, I'. L'21. 



Hah. North America. 



Of a 

 species. 



;ubtri 



mactra 



ike 



