﻿3yH ANorxiNTA 



Margaron ( .Inodonta ) gihboso Lka, Syn.. 1832. p. 51 : 1870, 



p. 81. 

 /hiodoii i:^ihh(>siis Sow i:i<i!N . C'oncli. Icon.. X\ II. 1S67. j)!. ix, 



f\g. 23. 



\"ar. dunlapiana Lea. 



Shell lont^er than the typical form, with fnll, somewhat ele- 

 vated beaks ; becoming' larij^e and (|uitc stronij. 



Lenji^th of ty]K' S4. heiijht 4C). diam. 35 mm. 



Length of a larti:e shell 145. hei.^ht S4. diam. 67. elevation 

 of beaks above dorsal line 6 mm. 



Type locality. South Carolina. 

 Anodonta dimlapiana Le.\, I'r. Am. Phil. Soc, IL 1842, p. 225; 



Tr. Am. Phil. Soc, MIL 1842, p. 248, pi. xxvii, fii^. 65; 



(M)s., IT I. 1842, p. 86. pi. XXVII, fig-. 65. — SovvERBV, Conch. 



Icon., XML 1869, pi. XXIII, fig. 87. — Ci.essix, Conch. Cab. 



Ano.. 1876. p. 220, pi. i.xxiv, figs. I, 2. 

 Anodonta •yibbosa \ar. diDiIapiatia v^iMi'Sox, Syn.. 1000, p. 636. 



Quite variable as to size, form and degree of solidity. To- 

 wards its northern range, it is often large, long oval and solid. 

 In Florida it is more delicate, thin and shorter. Lea's Ano- 

 donta diinhipiana mav stand i)ossiblv as a variety, though it 

 blends almost im])erce]>tiblv into other variations. 



Anodoxt.v coui'Ekiaxa Lea. 



Shell more or less inflated, thin and fragile, varying frouT 

 ovate to obovate. inequilateral ; beaks compressed in young or 

 small sjiecimens with rather delicate, subconcentric undulations, 

 full but not much elevated in old shells ; anterior end rounded : 

 hinge line lightly arched ; dorsal slope obliquely truncated to 

 the posterior point, which is placed on or near the median line ;• 

 base rounded, often full behind the middle; surface with light 

 concentric stri.T; e])i(lermis straw-color, \ellow or \ellowish- 

 green. generally with beautiful undulated rays; nacre bluish,, 

 usually purple-tinted and iridescent. 



