66 SUPPLEMENT TO ISAAC LEA'S PAPER ON UNIONID^. 



tions of the tips of" the beaks of the young and perfect specimens are very much 

 like those of complmiatus, Sol. 



Unio invenustus. pi. 22, fig. 62. 



Testa Isevi, oblonga, subcompressa, valde InEequilaterali, postice subbiaiigulari, antice rotundata ; val- 

 vulis crassiusculis, antice aliquanto crassioribus; natibus prominulis; epidermide tenebroso-fusca, 

 obsolete radiata ; dentibus cardinalibus parviusculis sulcatisque ; lateralibus sublongis, curvatis 

 lamellatisque ; margarita livida et iridescente. 



Shell smooth, oblong, somewhat compressed, very inequilateral, subbiangular 

 behind and rounded before ; valves rather thick, somewhat thicker before ; beaks 

 somewhat prominent; epidermis dark brown, obscurely rayed; cardinal teeth rather 

 small and sulcate; lateral teeth rather long, curved and lamellar; nacre livid color 

 and iridescent. 



Proc. Acad. Nat. Sci., 1813, p. 424. 



Hah. — Columbus, Georgia, G. Hallenbeck ; Russell Co., Georgia, Dr. Neisler ; 

 Irwin's Creek, North Carolina, C. M. Wheatley. 



My cabinet and cabinets of C. M. Wheatley and Dr. Lewis. 

 Diam. -7, Length I'l, Breadth 2'2 inches. 



Shell smooth, oblong, somewhat compressed, flattened at the sides, very inequi- 

 lateral, subbiangular behind and rounded before ; valves rather thick, somewhat 

 thicker before; beaks somewhat prominent; ligament small, thin and dark brown- 

 epidermis dark brown and obscurely rayed, with rather close marks of growth; 

 umbonial slope obtusely angular; posterior slope compressed, narrow elliptical, 

 with a broad slight impression from the beaks to margin; cardinal teeth rather small 

 and sulcate ; lateral teeth rather long, curved and lamellar ; anterior cicatrices dis- 

 tinct, rather small and well impressed; posterior cicatrices confluent, rather large 

 and moderately impressed ; dorsal cicatrices placed nearly in the centre of the 

 cavity of the beaks ; cavity of the shell rather shallow ; cavity of the beaks very 

 shallow; nacre livid color and iridescent. 



Remarks. — Nearly a dozen specimens have been in my possession for some time, 

 without my being able to place them in any species with which I am acquainted. 

 It is near hasalis herein described, but the beaks are not so medial, and it is smaller 

 and more compressed. It is also higher in the wing and more obliquely rayed. 

 Neither of those before me is perfect enough in the beaks to display undulations 

 of the tips. 



