8 THE AMERICAN MIDLAND NATURALIST 
Anodonta salmonia Lea, Tr. Am. Phil. Soc. 2nd. ser. Vol. VI, p.“45, 1836. ~- 
Anodonta decora Lea, Tr. Am. Phil. Soc., 2nd, ser. Vol. VI, p. 64, 1836. 
Anodonta gigantea Lea, Tr. Am. Phil. Soc. 2nd. ser. Vol. VI, p. 1, 1838. 
Anodonta ovata Lea, Tr. Am. Phil. Soc., 2nd. ser. Vol. VI, p. 2, 1838. 
Anodonta harpethensis Lea, Tr. Am. Phil. Soc., 2nd. ser. Vol. VIII, p. 224, 
1840. 
Anodonta inornata Anthony, Am. Jl. Conch., Vol. II, p. 145, 1866. 
The largest specimen of this species in the collection at my 
disposal was taken from St. Mary’s Lake, Notre Dame,—about 
half a mile from the St. Joseph River. This shell, collected in 
I914, measures 153mm. in length, 80mm. in height and has a 
diameter of 60mm. All the other shells in the collection are from 
the river. The shell of the young is thin and fragile; in older 
specimens it becomes more solid. ‘The surface is strongly marked 
by lines of growth,—the lines becoming ridges in the older shells. 
The umbones are prominent, but little elevated, of a greenish or 
bronze color.” In all the specimens of this collection the umbones 
are eroded and marked by five elevated, wavy wrinkles arranged 
in two parallel rows. The ligament is quite strong and horn colored. 
The epidermis varies in color from a greenish yellow in the young 
to a dark brown in older specimens. The rays mentioned by some’ 
writers are wanting in all the specimens before me. The adductor 
muscle scars and the pallial line are present but not impressed. 
The nacre is silvery white in the young but changes to cloudy in | 
older specimens. Some of the specimens show a deep purple nacre 
and copper blotches; all the specimens show iridescence. 
Length 153 Height 80 Diameter 60 _* 
99 af : 44 
84 49 32 
72 38 2. 
61 a5 27 
SyMPHYNOTA CostTaTa (Rafinesque). 
Alasmidonia cosiata Rafinesque, Ann. Gen. Sci. Brux., V, 1820, p. 318, pl. 
mule Mee ioe ters rs iG. 
Complanaria costata Conrad, Proc. Acad. Nat. Sci. Phil., VI, 1853, p. 26r. 
Symphynota cosiata Simpson, Syn., 1900. p. 665. 
Alasmodonta rugosa Barnes, Am. Jl. Sci. ,VI, 1823, p. 278, pl. XIII, fig. 21. 
Mya rugosa Eaton, Zool. Text-Book, 1826, p. 222. 
Unio rugosa Hanley, Biv. Shells,-1843,-p. 211. pl. XXI, fig. 8. 
Baphia rugosa H & A Adams, Gen. Rec: Moll., II, 1857, p. 500. 
Lasmigond rugosum Rafinesque, Cont. Mon., 1831, p. 5. 
Alasmodonta hians Ferrusac, Guerre Mar. 1635-epe.25. 
