The American Midland Naturalist 
PUBLISHED BI-MONTHLY BY THE UNIVERSITY 
OF NOTRE DAME, NOTRE DAME, INDIANA 
VOL. Vit: JANUARY, to2r. NOy 13 
A Preliminary Report on the Uniondae of St. Joseph River. 
BY FRANCIS WENNINGER 
The following report was compiled from matertal collected by 
the Rev. A. M. Kirsch, C. S. C., Professor of Zoology in the Uni- 
versity of Notre Dame. It represents the work of years of collecting, 
done during such time as could be spared from active duty in the 
lecture-room or laboratory. The measurements given are from 
specimens that are believed to be representative, and are all ex- 
pressed in millimeters. The descriptions are based on the Mollusca 
of the Chicago Area, by Baker; the Mollusca of Indiana, by Call; 
and the synonymy is that of Charles Torrey Simpson as given 
in his Descriptive Catalogue of the Naiades or Pearly Fresh Water 
Mussels, published by Bryant Walker, Detroit, rg14. 
LAMPSILIS VENTRICOSA (Barnes). 
Unto veniricosus Barnes, Am. Jl. Sci., VI, 1823, p. 267, pl. XIII, fig. ww. 
Mya ventricosus Eaton, Zool. Text-Book, 1826, p. 221. 
Lampsilis ventricosus Baker, Moll. Chi. Pt. 1, 1898, p. 94. 
Unio accidens Lea, Tr. Am. Phil. Soc., III, 1829, p. 435, pl. X. fig. 16. 
Unio subovatus Lea, Tr. Am. Phil. Soc., IV, 1831, p. 118, pl. XVIII, fig. 46. 
Unio cardium Conrad, New F. W. Shells, 1834, p. 68. 
Unio fasciolus Ferrusac, Guer. Mag. 1835. p. 26. 
Unio ovata Deshayes, An. sans Vert. 3rd. ed. 1839, p. 669. 
Unio lenis Conrad, Monog., XII, 1840, p. 106, pl. LVIII, fig. 2. 
Unio canadensis Lea, Proc. Acad. N. Sci. Phila., I, 1857, p. 85. 
Unio dolabraeformis Sowerby, Conch. Icon., XVI, 1867, pl. LIX, p. 298. 
The species was found in the St. Joseph River near Mishawaka, 
in 1913. The peculiar slope of the posterior portion of the shell 
as also the formation of the beak are characteristic of this shell. 
The shell is inflated, rather thin for its size and heavy. Its shape 
is elliptical rather than oval. The margin, especially in older 
specimens, is concentrically sculptured. The epidermis is shining 
and smooth,—characters that are both lost with age. There are 
* January 20, 1921.—Pages 1 to 28. 
