70 DESCRIPTION OF NEW 



Diam. 1-4, Length 1-9, Breadth 1-9 inches. 



Shell nodulous, subrotund, emarginate behind, inflated, ponderous, 

 sulcate on the posterior slope ; substance of the shell very thick ; um- 

 bones large; beaks very prominent; tubercles not numerous, rather 

 small, disposed to be erect and transverse ; ligament rather short ; epi- 

 dermis dark brown ; cardinal teeth large and spread out ; lateral teeth 

 short, thick, and nearly straight ; anterior cicatrices distinct ; posterior 

 cicatrices distinct; dorsal cicatrices situated on the inferior portion of 

 the cardinal teeth ; cavity of the shell small ; cavity of the beaks deep 

 and angular; nacre chocolate-colour. 



Remarks. — This shell is very closely allied to the verrucosus 

 (Barnes), and has been, I believe, generally considered as a variety of 

 it. In several of its characters, however, it is quite distinct. It differs 

 in being a smaller shell, in being much more inflated over the umbones, 

 in the granules or tubercles being smaller, more erect and more trans- 

 verse. In the epidermis it is much darker. In my youngest specimen 

 the beaks are nearly perfect, and at the tip they are very minutely and 

 closely undulated. 



Unio splendidus. Plate XIX. fig. 61. 



Testa elUptica, valdh inflata ; valvulis subcrassibus ; natibus prominentibus ; epidermide 

 valdi radiata; dentibus cardinalibus subcompressis ; lateralibus remolis lamellatisque ; mar- 

 garita splendidd rosaque. 



Shell elliptical, very much inflated ; valves rather thick; beaks prominent; epidermis 

 very much rayed ; cardinal teeth somewhat compressed ; lateral teeth separate and 

 lamellar ; nacre splendid rose-colour. 



Hab. Altamaha River, near Darien, Geo. James Hamilton 

 Cowper, Esq. 



Hab. Altamaha, Liberty County, Geo. Lewis Leconte, Esq. 



My Cabinet. 



Cabinet of Professor Shepard. 



Cabinet of Major Leconte. 



