NO. 1205. SY^mPSTS OF THE XJIADES— SIMPSON. 777 



^ Quadrula lachrymosa Baker, Moll. Chicago, Pt. I, 1898, p. 83, pi. xxv, fig. 1 ; xii, 

 fig. 2. 



t * Unio asperrimus Lea, Tr. Am. Phil. See, IV, 1831, p. 71, pi. v, fig. 3 ; i * Obs., I, 

 1834, p. 81, pi. V, fig. 3.—* Hanley, Test. Moll., 1842, p. 178 ; * Biv. Shells, 1843, 

 p. 178, pi. xxr, fig. 12. — *Potiez and Michaud, Gall. Moll., 1844, p. 156, pi. lix, 

 figs. 2, 3. — * CMxow and. Reeve, Conch. Nona., 1845, p. 56. — * H. and A. Adams, 

 Gen. Eec. Moll., II, 1857, p. 497.— * Chenu, 111. Conch., 1858, pi. ix, figs. 1, 

 la, lb.—* B. H. Weight, Check List, 1888. 



* Margarila ( Unio) asperrimus Lea, Syn., 1836, p. 14; 1838, p. 15. 



* Margaron ( Urdo) asperrimus Lea, Syn., 1852, p. 21 ; 1870, p. 33. 



''Unio qudrulus Say, Am. 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 quadratus Reeve, Conch. Icon., XVI, 1864, pi. vi, fig. 24. 



t QUADRULA LACHRYMOSA var. LUNULATA Pratt. 



* Unio lunulatns Pratt, Proc. Dav. Acad. Nat. Sci., I, 1876, p. 167, pi. xxxi, fig. I.2 



Entire Mississippi River drainage 5 various localities in the St. Law- 

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



t QUADRULA COUCHIANA Lea. 



* Unio coucManus 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, Couch. 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^ coucManus Lea, Syn., 1870, j). 54. 



Rio Salado, Mexico; southwestern Texas. 



t QUADRULA 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; vii, fig. 27.— *B. H.Wright, Check 

 List, 1888.—* PiETEL, 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. 



* Unio frag osa Catlow and Reeve, Conch. Nom., 1845, p. 59. 



' Dr. Lea separated this from his laclrrymosus 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 to doubt whether the asperrimus was valid. 



"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. 



