53 



LEPTON FABAGELLA. 



Tab. XI, ^^.3. 



SPECIFIC CHARACTER. 



Shell subovalj convex, with minute crowded con- 

 centric lines ; beaks central, rather prominent ; epi- 

 dermis yellowish, very thin, wrinkled ; teeth similar 

 in each valve ; the posterior tooth longest, and angu- 

 lated under the beak. 



OBSERVATIONS. 



This shell was found on the coast of Rhode Island, 



by Col. Joseph G. Totten, of Newport, who kindly 

 sent it for my inspection. I think it may prove to 

 be identical with one of the species figured by Capt. 

 Brown, but as I have not his descriptions, I cannot 

 be certain of it. 



ARTEMIS. 



GENERIC CHARACTER. 



Shell lentiform, with regular concentric strise ; 

 hinge with two sulcated teeth in the right valve ; left 

 valve with a compressed anterior tooth, and a groove 



