ON THE NEW GENUS OF BIVALVE. 



CURVIROSTRUM S1RIATUM. 



By PROFESSOR BUCKMAN, F.G.S., F.L.S., $v., 



shell belongs to the family Arcadft, which is thus 

 distinguished by Dr. Carpenter : 



Shell regular, equi valve, with strong epidermis, 

 hinge with a long row of similar, comb-like teeth, muscular 

 impressions sub-equal, structure corrugated with vertical tubuli 

 in rays between the ribs or stria. 



The annexed wood-cut shows the left valve of a large speci- 



men. 



FIG. I.- CTJKVIBOSTBUM STEIATUM. 



The Genus is distirguished by an abnoimally produced and 

 incurved umbo. 



FIG II. TJMEO OF CUEVIEOSTEUM. 



