THE NATURAL HISTORY SURVEY. 51 
2. Breadth generally great, compared with length; color 
light green or brownish horn, not generally distinctly 
rayed; umbonal sculpture fine; attains but two-thirds 
EAEYSI ZEON LA aor ermere neta kete Niet erse e's. cette e's ere e heave Navel a ates footiana 
B. Shell small. 
1. Elliptical or cylindrical, umbones flush with the hinge 
line; color greenish, with faint rays; very thin and 
ETc OR vy ree Rene ie rosa sa suc 1a.e! a= diesels Siw 'eleSisrmeae hes imbectlis 
GROUP OF ANODONTA GRANDIS. 
Shell large, inflated; umbonal region swollen beak; sculpture 
consisting of somewhat doubly-looped ridges which are often 
nodulous at the extremities of the loops. (Simpson.) 
1. Anodonta grandis Say, pl. ii., pl. iii., fig. 1, pl. iv., fig. 1. 
Anodonta grandis Say, New Harmony Disseminator, Vol. II., No. 22, p. 
341, 1829. 
Anodonta plana LEA, Trans. Amer. Phil. Soc. 2d series, Vol. V., p. 48, pl. 
ii., fig. 18, 1834. 
Anodonta declivis CONRAD, Amer. Journ. Sci. and Arts, Ist series, Vol. 
XXV., p. 841, pl, i., fig. 11, 1884. 
Anodonta salmonia Lea, Trans. Amer. Phil. Soc., 2d series, Vol. VI., p. 45, 
pl. xiv., fig. 41, 1836. 
Anodonta decora Lea, Trans. Amer. Phil. Soc., 2d series, Vol. VI., p. 64, 
pl. xx., fig. 68, 1836. 
Anodonta gigantea Lea, Trans. Amer. Phil. Soc., 2d series. Vol. VI., p. 1, 
pl. i., fig. 1, 1888. (Variety, including the wide forms known as 
plana, decora, etc.) 
Anodonta ovata LrEA,Trans. Amer. Phil. Soc., 2d series, Vol. VI., p. 2, pl. 
il., fig. 2, 1888. 
Anodonta harpethensis Lea, Trans. Amer. Phil. Soc., 2d series, Vol. VIII., 
p. 224, pl. xix., fig. 42, 1840. 
Anodonta inornata ANTHONY, American Journal of Conchology, Vol. II., 
p. 145, 1866. TZeste Lea.* 
Shell: When adult, rather solid; when young, thin and frag- 
ile; elliptical, more or less ‘nflaned, well rounded before and 
triangular behind, the point of the triangle rounded; dorsal 
margin straight in the young but slightly curved in the adult, 
ventral margin generally straight, but sometimes very much 
rounded, posterior margin forming an ellipse in the male and a 
ram shape in the female; surface strongly marked by growth 
lines, which become elevated ridges as the shell increases in 
age; umbones not much elevated (generally), of a greenish 
golden or bronze color in the young, but becoming dark brown- 
ish or greenish with age, frequently eroded, and marked by five 
*Some of the synonymy adopted for the Unionid@w is taken from Prof. Call’s work on 
Arkansas Unionide in Trans, Acad. Sci., St. Louis, Vol. VII., No. 1, 1895. 
