﻿96 LAMPSILIS 



Mari^arita (Uniol rcclus Lka, Syn., 183O, p. 34; 1838, p. 2^. 

 Margaron (Uiiio) rectus Lka, Syn., 1862, p. 35 ; 1870, p. 57. 

 Lampsilis rectus Smith, Bull. U. S. Fish Com., 1899, p. 290. 



pi. Lxxvni, — Simpson, Syn., 1900, p. 544. 

 Unio latissinia Kafinesque, An. Gen. Sci. Phys. Brux., Pt. 



13, V, 1820, p. 297, pi. Lxxx, figs. 14, 15. 

 f Unio l^ra-longus Barnes, Am. Jl. of Sci., VI, 1823, p. 261, pi. 



xiii, fig-. II. — H11.DRETH, Am. Jl. of Sci., XIV, 1828, p. 286, 



fig. 18^ 

 Mya proelonga Eaton, Zool. Text-Book, 1826, p. 220. — Wood, 



Ind. Test. (Hanley), 1856, p. 200, pi. i, Supp., fig. 11. 

 Eurynea proelonga Stimpson, Shells of N. Eng., 1851, p, 13. 

 ? Unio arquattis Conkad, Jl. Ac. N. Sci. Phila., 1854, p. 297, 



pi. XXVI, fig. 8. 

 ,Unio leprosus Mir.ES, Rep. Geol. Sur. Mich., 1861, p. 240. 



Var. sageri (Conrad). 



Shell smaller than the type, with a more decided posterior 

 ridge, below which it is somewhat compressed ; color chestnut, 

 tawny, greenish or olive, often faintly rayed, rest periods gen- 

 erally well marked ; nacre bluish-white, rarely tinted purplish, 

 often blotched ; marsupial swelling moderate. 

 Length 95, height 42, diam. 28 mm. 



Type locality, Detroit River, Michigan. Also, Red River of 

 the North. 



Unio sageri Conrad, Monog., VI, 1836, p. 53, pi. xxix, fig. i. 

 A very common, widely distributed form that should not be 

 mistaken for any other. Conrad's figure of Unio sageri is 

 hardly characteristic, being too high in proportion to its length. 

 The northern form is probably worthy of a varietal name. The 

 specimens from the Alabama River drainage are smaller than 

 those from the Mississippi Valley, but do not differ sufficiently 

 to require a varietal name. 



DeCamp's Unio anodontoides, reported from Michigan, is 

 a tawTiy-colored variety of this species according to Walker, 

 the Unio sageri of Conrad. 



