UNIO DECLIVIS. 



SPECIFIC CHARACTER. 



Anterior margin rectilinearly and obliquely truncate. 



SYNONYM. 



U. DECLIVIS, Nob. Transylvania Journal^ Vol. 4, p. 527. 



DESCRIPTION. 



Shell transverse, moderately thick ; posterior margin 

 short and obtusely rounded : beaks hardly elevated : hinge 

 margin rather elevated and compressed, angulated at tip : 

 anterior margin rectilinear, descending obliquely forward, 

 to a prominent rostrum of the anterior basal margin at the 

 extremity of the umbonial slope : umbonial slope not ele- 

 vated above the curvature of the disk, but is bounded on 

 its anterior side by two slightly impressed lines : basal 

 margin arquated : surface deeply wrinkled : within ting- 

 ed with purplish : cardinal teeth oblique : lateral teeth d'ls- 

 tant from the cardinal teeth, rectilinear, oblique with res- 

 pect to the base. 



OBSERVATIONS. 



Several specimens were sent to me by Mr. Barabino, 



PI. 85. 



