22 THE NAUTILUS. 



pre.ssus Lea, pressus Lea, pressusLea. 



l^ustulatus Lea (rare). 



pu.stulosus Lea. 



pyramidatus Lea. 



rangianus Lea, raugiauus Lea. 



rubigiuosus Lea rubiginosus Lea. 



(common), (common). 



rectus Lam., rectus Lam. 



Kirtlandiana Lea, ? ? 



? ? subrotundus Lea. 



triangularis Lea, triangularis Lea, 



tuberculatus Barnes, tuberculatus Barnes. 



undulatus Barnes, undulatus Barnes. 



verrucosus Barnes verrucosus Barnes 



(rare). Very large. (rare). 



THE SHELL-BEARING MOLLUSCA OF ERODE ISLAND. 



BY HORACE F. CARPENTER. 



FAMILY UXIOXID^E. 



189. — Unio radiatus. 

 Syns.: 



3Iya radiata, Gm. Dill. Wood. 



Mya oblonga, Wood. 



Lampsilis radiata, Stimp. Morse. 



Unio Virginiana, Lam. 



Unio radiata, modern authors. 



Shell transversely oblong-ovate, broader and angular behind ; 

 beaks nearer the anterior extremity; epidermis concentrically 

 wrinkled, olivaceous with numerous lines of a greenish color radiat- 

 ing from the beaks to the margin ; nacre bluish-white, irridescent 

 at the posterior portion, with flesh colored tints ; cardinal teeth 

 strong, erect, ti'iangular pyramidal. Length 3 inches, height li'o, 

 breadth li. 



It inhabits ponds and rivers on the eastern slope of the Allegha- 

 nies and is quoted as being one of our most common species, but it is 



