According to Blainville, two fossil species have been dis- 

 covered by Defrance. The animal is so similar to that ol' 

 SoLEN, that Poli has referred it to the same genus, which 

 he calls Hypogea. 



PANDORA TRILINEATA. 



SPECIFIC CHARACTER. 



Hinge margin bilineate from the beak to the tip; valves 

 not very inaequal. 



SYNONYM. 



Pandora trilineata. Nobis. Jour. Jicad. Nat. Sc. 

 vol. iv. p. 261. 



DESCRIPTION. 



Shell perlaceous whitish, translucent, concentrically 

 wrinkled : hinge placed at the posterior slope, which is 

 very abrupt, and forming a considerable obtuse angle with 

 the hinge margin : teeth three in the left valve, the middle 

 one shortest, the anterior one longest, parallel and near to 

 the hinge margin and having the fosset on its inner basal 

 side : hinge margin concavely much arquated, its surface 

 flattened and bounded on its outer edge by two elevated, 

 approximate, obtuse lines, originating at the beak, and con- 

 tinued to the rostrated tip : rostrum ascending : a longitu- 

 dinal, slightly impressed line, originates at the beak and 

 passes to the middle of the basal margin. 



OBSERVATIONS. 



I first discovered a single valve of this shell, several years 

 since at Great Egg Harbour on the coast of Newjersey ; 



PLATE II. 



