NO. 1205. SYNOPSIS OF THE XJUDKS SIMPSON. Ill 



* (Juadrula laclirymosa BAKER, Moll. Chicago, Ft. I, 1898, p. 83, pi. xxv, fig. 1; xil, 



fig. 2. 



fUnio asperrimus LEA, Tr. Am. Phil. Soc., IV, 1831, p. 71, pi. v, fig. 3; 1 *Obs.,I, 

 1834, p. 81, pi. v, fig. 3.* HANLEY, Test. Moll., 1842, p. 178 ; * Biv. Shells, 1843, 

 p. 178, pi. xxi, fig. 12. *POTIEZ and MICHAUD, Gall. Moll., 1844, p. 156, pi. LIX, 

 figs. 2, 3. * CVTLOW and REEVE, Conch. Nom., 1845, p. 56. * H. and A. ADAMS, 

 Gen. Rec. Moll., II, 1857, p. 497. * CHENU, 111. Conch., 1858, pi. ix, figs. 1, 

 la, !&. * B. H. WRIGHT, Check List, 1888. 



* Margarita ( Unio) asperrimus LEA, Syn., 1836, p. 14; 1838, p. 15. 



* Marrjaron ( Unio) asperrimus LEA, Syn., 1852, p. 21 ; 1870, p. 33. 



* Unio qudrulus SAY, Ain. Conch., VI, 1834.* CONRAD, New F. W. Shells, 1834, p. 



71. *FERUSSAC, Gner. Mag., 1835, p. 27. * CONRAD, Pr. Ac. N. Sci. Phila., 

 VI, 1853, p. 256.* KUSTER, Conch. Cab. Unio, 1861, p. 184, pi. LVIII, fig. 1. 

 *Unio quadratic REEVE, Conch. Icon., XVI, 1864, pi. vi, fig. 24. 



fQUADRULA LACHRYMOSA var. LUNULATA Pratt. 



* Unio lumtlatus PRATT, Proc. Dav. Acad. Nat. Sci., 1, 1876, p. 167, pi. xxxi, fig. I. 2 



Entire Mississippi River drainage ; various localities in the St. Law- 

 rence basin; Red River of the North; southwest into eastern Texas. 



fQUADRULA COUCHIANA Lea. 



* Unio couchianus LEA, Pr. Ac. N. Sci. Phila., IV, 1860, p. 305 ; Jl. Ac. N. Sci. Phila., 



IV, 1860, p. 371, pi. LXVI, fig. 196; * Obs., VIII, 1860, p. 53, pi. LXVI, fig. 196. 

 *SOWERBY, Conch. Icon.,' XVI, 1868, pi. LXXXI, fig. 429. * B. H. WRIGHT, 

 Check List, 1888. *P,ETEL, Conch. Sam., Ill, 1890, p. 149. * FISCHER and 

 CROSSE, Miss. Sci., Pt. 7, II, 1894, p. 566. * SIMPSON, Proc. U. S. Nat. Mus., 

 XIX, 1896, p. 370. 



* Margaron (Unio) couchianus LEA, Syn., 1870, p. 54. 



Rio Salado, Mexico; southwestern Texas. 



tQUADRULA FRAGOSA Conrad. 



* Unio fragosus CONRAD, Monog., II, 1836, p. 12, pi. vi, fig. 2; *Pr. Ac.N. Sci. 



Phila., VI, 1853, p. 249. *H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 

 497. * KUSTER, Conch. Cab. Unio., 1861, p. 173, pi. LV, fig. 1. * REEVE, 

 Conch. Icon., XVI, 1864, pi. i, fig. 2; vn, fig. 27. *B. H.WRIGHT, Check 

 List, 1888.* P^ETEL, Conch. Sam., Ill, 1890, p. 153. 



* Margarita ( Unio) fragosus LEA, Syn., 1836, p. 14; 1838, p. 15. 



* Margaron ( Unio) fragosus LEA, Syn., 1852, p. 22 ; 1870, p. 33. 



* Uniofragosa CATLOW and REEVE, Conch. Nom., 1845, p. 59. 



1 Dr. Lea separated this from his lachrymosus because the latter had tearlike 

 nodules, while those of asperrimus were simply elevated. The two forms absolutely 

 run together, and specimens may be found in which both varieties of nodules occur. 

 There are forms which are almost smooth, and there is great diversity in the matter 

 of inflation. Dr. Lea finally came ta doubt whether the asperrimus was valid. 



2 I think that this is a solid, inflated variety of lachrymosus. From the figure, Pratt's 

 specimens seem to have few tubercles; but I have seen quite a number of shells from 

 the Ohio River north to Minnesota which resemble it in shape, but are strongly 

 pustulous throughout. I was at first inclined to believe these were varieties of 

 asper, but I now regard them as a form of lachrymosus, and they may perhaps be 

 referred to Pratt's variety. He describes his species as having a large lunule, but 

 individuals vary greatly in this character. 



