THE NAUTILUS. 101 



to by Binney (p. 222) as collected by Hemphill at Clingmaii's 

 Peak, North Carolina, is doubtfully identical with Eland's type, 

 and should take the varietal name of V. clmgmani, which may 

 eventually prove of specific rank. 



The present species is named in honor of Mr. Rader, an interested 

 student of the land shells of Cumberland, at the request of Prof. 

 Shriver. The type is in the National Museum. 



A NEW UNDULATE UNIO FROM ALABAMA. 



BY BERLIN H. WRIGHT. 



Unio triumphans sp. nov. 



Shell sub-triangular, with an elevated wing which is connate at 

 its point, coarsely and interruptedly undulate over the entire disk, 

 except on the extreme anterior and superior parts where pustula- 

 tions and Iterations replace them. Disk gradually and uniformly 

 flattened out to the margins from the highest point near its centre : 

 the indistinct umbonal ridge dividing the disk area into two nearly 

 equal parts. Substance of the shell moderately thick ; thicker be- 

 fore. Epidermis dead black. Greatest diameter in the center of 

 the shell. Dorsal notch very long and deep. Cavity of the beaks 

 deep. Posterior cicatrices confluent ; anterior ones distinct. Lat- 

 eral teeth short and distant from the cardinals which are depressed. 

 Nacre dull white in front and a bright coppery tinge behind, and 

 very iridescent. Width 4 inches, length 5 inches, diameter 2 

 inches. 



Habitat, Coosa River, St. Clair Co., Alabama. 



Type in National Museum. 



Remarks : For several years we have had old specimens of this 

 shell and could not place them satisfactorily with any known form. 

 In a recent collection of one thousand shells from this vicinity we 

 found twenty specimens of all ages which at once made its novelty 

 appparent. 



The natural place we assign the species is between U. boykmianiis 

 Lea and U. multiplicatus Lea, and it also possesses characters of U. 

 undulatus Barnes. Compared with the first, our shell is more 

 winged and therefore more triangular in outline ; the ridges are 

 fewer, not so prominent and more broken, like Unio widulatus 



