564 PROCEEDINGS OF THE NATIONAL MUSEUM. 



t * Unio bealei LEA, Pr. Ac. N. Sci. Phila., VI, 1862. p. 169; * Jl. Ac. N. Sci. Phila., V, 

 1862, p. 204. pi. xxx, fig. 273; *Obs., IX, 1863, p. 26, pi. xxx, fig. 273. *B. H. 

 WEIGHT, Check List, 1888. 

 Maryaron ( Unio) bealei LEA, Syn. 1X70, p. 49. 



t LAMPSILIS TEXASENSIS var. COMPRESSUS Simpson.' 



Texas, north to Kansas; Missouri; southern Illinois and Indiana; 

 south through Tennessee, Alabama, Mississippi, and Louisiana; the 

 variety in southwest Texas. 



t LAMPSILIS MEARNSI Simpson. 

 *Lamp8il\8 mearimi SIMPSON, Pr. Ac. N. Sci. Phila., 1900, p. 75, pi. i. iig. 4. 



Vicinity of Fort Clarke, Kiiiney County, Texas. 



t LAMPSILIS PARVUS Barnes. 



* Unio pan-ns BARNES, Ain. Jl. Sci., VI, 1823, pi. xiu, fig. 18 (outline).- SHORT and 



EATON, Transylvania Journal, 1831, p. 78. *CONRAD, New F. W. Shells, 1834, 

 p. 70. *SAY, Am. Conch., VI, 1834. FERISSAC, Guer. Mag., 1835, p. 26. 



* HANLEY, Test. Moll., 1842, p. 196.* PHILIPPI, Abbild, I, 1845, p. 19, pi. i, 

 fig. 4. *CATLOW and REEVE, Conch. \om., 1845, p. 62. *KL T STER, Conch. Cab. 

 Unio, 1852, p. 33, pi. v, fig. 5.* CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 

 25. *H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 494. *B. H. WRIGHT, 

 Check List, 1888. *P.*:TEL, Conch. Sam., Ill, 1890, p. 162. 



* Margarita ( Unio) parr us LEA, Syu., 1836, p. 28; 1838, p. 21. 

 *Maryaron ( Unio) parvus LEA, Syn., 1852, p. 31; 1870, p. 49. 

 *Lamp8ill8parrnx BAKER, Moll. Chicago, Pt 1, 1898, p. 109, pi. xiu, fig. 3. 

 *Myaparva EATON, Zool. Text- Book, 1826, p. 222. 



Mississippi River drainage generally; southwest to central Texas; 

 western Xew York; southern Canada; and Michigan doubtfully. 



t LAMPSILIS HALEIANUS Lea. 1 



* Unio haleianus LK A, Pr. Am. Phil. Soc., II, 1842, p. 224 ; * Tr. Am. Phil. Soc,, VIII, 



1842, p. 247, pi. xxvii, fig. 63 ; " Obs., Ill, 1842, p. 85, pi. xx vn, fig. 63. CON- 

 RAD, Pr. Ac. Nat. Sci. Phila., VI, 1853, p. 250. *H. and A. ADAMS, Gen., Rec. 

 Moll., II, 1857, p. 494. *CHENU, 111. Conch., 1858, pi. xxvi, figs. 6, 6, 66. 



* ? REEVE, Conch. Icon., XVI, 1865, pi. xxiv, fig. 116.* B. H. WRIGHT, Check 

 List, 1888.* P.KTEL, Conch. Sam., III. 1890, p. 154. 



*Margaro ( Unio) haleiantts LEA, Syn., 1852, p. 31; 1870, p. 49. 



Alexandria, Louisiana; eastern Texas. 



1 A remarkably compressed elevated form from southwest Texas may bear this name. 



2 Barnes's outline shows a small shell, erenly rounded posteriorly. I believe that 

 this character of being rounded behind is constant, and is the only one by which it 

 always differs from its near ally, L. texasensis, which is more sharp behind and usually 

 obliquely truncate at the post-base. The two species have been continually con- 

 founded, and even Dr. Lea has placed in his collection under the name parvus a 

 number of specimens which I am sure are his texasensis. The former is generally the 

 smaller of the two, though not always, as in northern Illinois it sometimes reaches 

 a length of 2 inches. L. texasensis undoubtedly ranges north into northern Missouri, 

 southern Illinois and Indiana, and the true parvus is occasionally found well down 

 into Texas. 



3 This is often confounded with L. texasensis. It is a larger, thinner-shelled form, 

 and is not so decidedly truncate at the post-basal region. 



