﻿294 (II'.OVARIA 



Unio dcpyyjs Conuad, Am. Jl. Conch., II, 1806, p. 107, pi x. 



fig. r. 

 Oboivria lens var. dr/^\<i!^is Siimi'Son, Syn., 1900. p. 601. 



\'ar. Ibarra n. v. 



Shell very much smaller than the type, varying from sub- 

 solid to moderately solid, subinflated to infiated ; nacre white 

 or rose-tinted. The female shells are shorter than the males, 

 wider behind, and Ivive a decided post-basal swelling, with a 

 shallow, wide, radial furrow above it. 



Length (male) 32, height 25, diam. 15 mm. 



Length (female) 29, height 27, diam. 17 mm. 



Maiuiicc and Wabash Rivers; Sandusky, ( )hio ; Tennessee. 



This shell has much the same coloring and general form as 

 O. lens, but is exceedingly dwarfed. .-\ specimen from the 

 Amite River, Clinton, Louisiana, may possibly be referred to 

 this. It is more inflated and is more regularly rounded than 

 other specimens of the variety. One shell of the variety has 

 pink-tinted nacre. 



\'ar. cloiii^aio n. v. 



There is a form found in the ( Jliio River, which is more 

 elongated and inflated than the type, and has the beaks nearer 

 to the anterior end, which may bear the above name. 



Length, 67, height 53, diam. 35 mm. 



This is, if a good species at all, an exceedinigly puzzling and 

 variable one. On the one hand it seems to almost insensibly 

 merge into O. circulus and by many good conchologists it is 

 thought to equal that species, while on the other it is with 

 difficulty separated from O. iiiiicolor. It is usually entirely 

 rayless and is duller colored than the latter. Specimens with 

 a pink or ])urplish nacre, which I formerly referred to this 

 species are, I believe. O. nnicolor. The variety elongata is dis- 

 tinct enough to be a valid si>ccics, but 1 hardly feel (|ualified. 

 with the small amount of material T have seen, to give it more 

 than varietal rank. Conrad's def^yi^is differs in being inequi- 



