THE NAUTILUS. 31 



P/'st'ditn>i walkeri Sterki. Amnicola limosa var. parva Lea. 



Plsidium cruciotum Sterki. ( 'incinnalia cincmnatiensis Lea. 



Pisidium punctatnm Sterki. Pomakiopsis cincinnatiensis An- 



Pisldium fallax Sterki. tliony. 



Pisidium splendidulum Sterki. Campeloma mfnm Haldeman. Ke- 



Pisidiinu varidbile Prime. versed. 

 Total 28 species. 



NEW SOUTHERN UNIOS. 



BY BERLIN II. WRIGHT. 



Unio Danielsii, sp. nov. 



Shell uniformly solid, very inequilateral, subquadrate, rayless ; 



posterior area closely, irregularly and sharply wrinkled ; umbonal 

 region traversed by several parallel, well-separated, flattened ridges 

 or growth lines, which merge together towards the base; umbos ex- 

 ceedingly inflated and umbonal ridge very sharp above, gradually 

 flattening out into biangulation towards the base ; umboj broad and 

 gracefully rounded ; beaks erect but evidently not prominent; lig- 

 ament dark red, not heavy; dorsal margin somewhat arched, abruptly 

 rounded before, nearly straight on base and bluntly pointed behind ; 

 teeth heavy, well separated, the laterals long and curved, the single 

 one having a central deep notch ; cicatrices deep, smooth, the pos- 

 terior ones confluent and the anterior ones distinct ; beak cavity very 

 slight; nacre creamy white with lavender border and very iridescent. 



Diameter 1.25, length 1.5, width 2.25 inches. 



Habitat : Spring Creek, Decatur Co., Ga. 



Type in National Museum. 



Remarks : Several quite distinct forms of this general type have 

 recently come to hand, some of which have been distributed under 

 the name of " U. incrassatus Lea. var.?" This form, however, de- 

 parts so far from that of the type of the group as to fully warrant 

 erection into specific rank. Its distinguishing feature is the remark- 

 able degree of inflation in the posterior umbonal region, prolonged 

 posterior and notched single lateral tooth. It is also rayless. 



It gives pleasure to name this for Mr. L. E. Daniels, of La Porte, 

 Ind., who, with others, has rendered financial aid to make these dis- 

 coveries possible. 



