﻿424 ANODONTA 



Sxmphyuola bcnedictcnsis Lua, Tr. Am. Phil. Soc, V, 1834, 



p. 104, pi. XVI, fii;-. 48; Ohs., I, 1834, p. 216, pi. xvi, fig. 48. 

 Anodofiia Invicdictcusis \h-. K.w, Zool. X. Y.. Pt. 5, 1843, P- 



204, pi. will, fig. 2,^c^. — CivivSSiN, Conch. Cah. Ano., 1875, 



p. 163, pi. Liv, figs. 1. 2. 

 Margarita (Atiodonta l bnicdicicnsis LiC-v. Syn., 1836, p. 28; 



1838, p. 29. 

 .Inodon bcncdictensis J^(iwi:ki!Y, Conch. Icon.. X\'II, 1870, pi. 



XXVI, fig. 99. 

 Margaron ( .Inodonta) bcncdictensis Li:\. Syn.. 1852. p. 47. 

 Anodonta grandis var. bcncdictcusis v^impsox, Syn., 1900, p. 



644. 

 Margaron (Anodonta j benedict ii Lka, Syn.. 1870, p. 75. 

 Atiodonta bencdictii L \tciii-(ihi), Tr. ( htawa F. X. Cl., 1882, 



P- 55- 

 Anodonta cultrata Gould, in letter. 



I have united under the name Anodonta grandis of Say a 

 large number of so-called s])ecies. retaining as varieties a few 

 forms, which typically have some claims to distinction. There 

 seem to be intermediates between all these forms, which per- 

 fectlv connect them. vSay's gratidis, of which I have seen what 

 I believe to be the type, is a somewhat elongated form, which 

 agrees very well with Lea's ovata. The shell, which Lea fig- 

 ured as the type of his A. gigantca, is not in his collection, but 

 it appears to be a slightly diseased individual. In many cases 

 specimens of what I believe to be this form become diseased 

 in the region of the posterior slope, that part becoming thick- 

 ened, rough and somewhat truncate. The healthy manifesta- 

 tions of this so-called species is larger, more robust, and a 

 little higher in proportion than Say's shell, but I cannot pos- 

 sibly se])arate it in any other way from . /. decora. A. Iiarf^eth- 

 ensis and several others. .1. plana of Lea is a little more com- 

 pressed, but T am sure is not worthy of a varietal name. .■/. 

 footiona. which T liclievc to lie identical witli . /. iiiarryattana, 

 is thinner and smaller and has normally a different texture 

 epidermis and often n.acre from A. grandis. but it is completely 



