﻿ANODONTA 399 



Length 70, height 40, diam. 28 mm. 



Length 98, height 55. diam. 39 mm. 



Georgia and Florida. 



Type locaHty, Hopeton, near Darien, Ga. 

 Anodonta cowperiana Lea, Pr. Am. Phil. Soc, I, 1840, p. 289. 

 Anodonta couperiana Lea, Tr. Am. Phil. Soc, VIH, 1842, p. 



227, pi. XX, fig. 46; Obs.. in. 1842, p. 65, pi. XX, fig. 46. — 



Ci.ESSiN, Conch. Cab. Ano., 1874, p. 148, pi. l, figs. 3. 4. — 



Simpson, Pr. U. S. Nat. Mus., X\\ 1892, p. 433, pi. lxxiv, 



fig. I. 

 Margaron (Anodonta) couperiana Lea, Syn., 1852, p. 51 ; 



1870, p. 81. 

 Anodonta cooperiana P.TiTel. Conch. Sam., IH, 1890, p. 178. 

 Anodonta gibhosa (part), Simpson, Syn., icx^o, p. 636. 



This species has been believed to be synonymous with A. 

 gibbosa Say and at the time of publishing the Synopsis I 

 shared this opinion. I believe now that it is a valid species 

 nearer to A. dnnlapiana Lea. The beaks are flattened ofif 

 more or less at all stages of growth, though in large specimens 

 they are full. It grows to a larger size than the above dimen- 

 sions but, so far as I have seen, is a smaller species than either 

 gibbosa or dnnlapiana. 



Group of Anodonta suborbicuJata. 



Shell large, compressed, suborbicular, somewhat produced 

 near the center of the base, rounded in front and bluntlv point- 

 ed behind, with a slight posterior dorsal wing ; beaks flattened, 

 the sculpture consisting of a few irregular ridges, which are 

 generally broken into nodules, sometimes only corrugated ; a 

 well-defined, but low, posterior ridge separates the smooth, 

 shining area in front from a darker and rougher one behind : 

 epidermis with numerous delicate, capillary rays near the 

 beaks ; muscle scars verv large ; nacre rather copperv and iri- 

 descent : pallial line broken, often marked with radiating 

 ridcfes. Animal unknown. 



