69 



OBSERVATIONS. 



This shell, I believe, has not been hitherto found 

 north of Florida, where my friend Dr. William Blan- 

 ding obtained a few bleached valves. The figure is 

 from a perfect specimen in the cabinet of Dr. R. E. 

 Griffith, who is not certain that it came from the 

 coast of the United States, although the circum- 

 stances under which he obtained it favour the suppo- 

 sition. 



CAPSA. 



GENERIC CHARACTER. 



Shell equivalve, inequilateral, oblong ; hinge with 

 one oblique tooth in the right valve ; left valve with 

 two teeth ; the anterior one largest, direct, subtrian- 

 gular and slightly bifid ; muscular impressions two, 

 distant ; palleal impression with a profound sinus, ex- 

 tending beyond the middle of the valves ; cartilage 

 situated in an exterior groove. 



OBSERVATIONS. 



So much does this genus resemble Iphigenia that 

 the two have often been confounded. The former 

 may be distinguished by the cartilage being placed 

 on the longer side of the shell, and by a slight 

 though characteristic difference in the cardinal teeth. 



