138 THE NAUTILUS. 



1899 Hanham— Nautilus Xllf, 1. 



Anthony — List of L. and F. W. Shells found in vicinity of Cincinnati. 



Hubbard— Cat. Terr, and Fluv. Shells of Ohio. 



1859 Chenu— Man. de Conch. I, 482, f. 3560. 



NEW SOUTHERN UNIOS. 



BY BERLIN H. AVRIGHT. 



Unlo Klngil, sp. nov. 



Shell small, moderately thin, plicate behind, inflated, elliptical 

 and very inequilateral. Epidermis dark yellow and covered through- 

 out with fasciculated rays, which are more or less interrupted, form- 

 ing arrow-shaped markings. Sides rounded, and with a slight 

 enlargement from umbo to base, causing a slight emargination be- 

 hind it. Beaks quite prominent and surrounded by ten or twelve 

 fine, irregular, broken concentric folds. Umbonal ridge well defined 

 and the terminus of all the knotty plications that thickly cover the 

 posterior area. Lateral teeth slender, straight and quite smooth ; 

 cardinals erect and well roughened. Anterior cicatrices scarcely 

 distinct and often confluent ; a deep extension running well under 

 the cardinals. Beak cavity slight ; cavity of shell profound and 

 uniform. Nacre variable, from greenish gray to rose. Width, If 

 in. ; length, f in. ; diam. § in. 



Habitat. A branch of the Flint R. in Baker Co., Ga. 



Type lot in National Museum. 



Remarks : Affinity, Unio Walkeri, Wrt. and U. penicillatus Lea. 

 From the former they are easily distinguished by their greater infla- 

 tion and rounded sides, and more rounded umbonal angle, the finer 

 and rougher plications and diminished length ; from the latter it 

 is also more inflated, darker and coarser, and has a sharper um- 

 bonal angle. In some specimens the rays almost disappear, and 

 again are so dense as to give a green appearance to the shell. 



Mr. Charles T. Simpson has compared the type lot with the Lea 

 types and considers it nearer to U. penicillatus Lea than to Walk- 

 ed, but sufficiently distinct from both to warrant the standing we 

 here give it. Mr. Simpson also suggests a generic name, by which 

 this group will be distinguished in his forthcoming Synopsis of the 

 family. 



It affords me pleasure to name this species for the discoverers, 



