I'llK Jai'AX Yoldia. Shell oblong, u little arched, 

 pale, smooth ; posterior side narrower, obtusely 

 acuminated above ; ventral margin suddenly 

 sloped upwards ; dorsal margin depressed, im- 

 pressed area defined ; anterior side roundish, 

 dorsal margin sloped. 



Adams and Reeve. Zool. Samarang. Mol, 7.5, pi. 21, 

 f. 9. 



Ilah. Japan. 



Sjtecies 21. (Fig. a, b, Mus. ? copied.) 



Yoldia eetusa. Yol. testd parvd, alM, suhventricoKl, 



nquilaterali ; hctere poslico sursum arcuato, mar- 

 ijine terininali svb-truncato, margine dorsali de- 

 presso, concavo. tnaiyine ventrali valde convexo. 



Tin: RETUSE YoLuiA. Shell small, white, subventri- 

 cose, equilateral ; posterior side curved upwards, 

 terminal margin subtruncated, dorsal margin de- 

 pressed, concave, ventral margin very convex. 



Hinds. (Nucula) Proc. Zool. Soc, 1843, p. 9'.). 



Hah. Straits of Malacca. Philippines. 



A very small white shell with a slight upward 

 curve. 



