NO. I'jos. si'.voy.s'/x or I'm: .Y.//.I />/:* sv.i/v.s'o.v. 545 



" I'nio (Li(/umia) recta SWAIXSON. Treat, on Mai.. 1X10, pp. 267, 274, fig. LV. 

 Unio reclus SHORT and EATON, Transylvania .11., 1831, p. 77. * CONRAD, New F. 

 \V. Shells, 1834, p. 71." SAY, Am. Conch., VI, 1834.* FERUSSAC, Guer. Mag., 

 1835, p. 27. *CONRAD, Mouog., Ill, 1836, p. 33, pi. xv. *HANLEY, Test. Moll., 

 1842, p. 204.* C. B. ADAMS, Thompson's Hist, of Vt., 1842, p. 167; * V. W. 

 and L. Sh. of Vermont, 1842, p. 17. * HANLEY, Biv. Shells, 1843, p. 204. 

 * DE KAY, Zool. of N. Y., Pt. 5, 1843, p. 195.* POTIEZ and MICHAUD, Gall. 

 Moll., 1844, II, p. 149, pi. LVII, figs. 3, 4. * CATLOAV and REEVE, Conch. Nom., 

 1845, p. 63. * KTSTER, Conch. Cab. Unio, 1852, p. 35, pi. vi, fig. 1; vn, fig. 

 1.* CONRAD, Pr. Ac. N. Sci.. Phila., VI, 1853, p. 256. * H. and A. ADAMS, 

 Gen. Rec. Moll., II, 1857, p. 491. *CiiENU, Man., 1859, II, p. 139, fig. 675. 

 REEVE, Conch. Icon., XVI, 1865, pi. xix, fig. 86. * CALKINS, Pr. Ottawa Ac., 

 1X71, p. 44. LATCHFORD, Tr. Ottawa F. N. Club, 1882, p. 50.* B. H. 

 WRIGHT, Check List, 1888.* P.ETEL, Conch. Sam., Ill, 1890, p. 165.* CALL, 

 Tr. Ac. Sci., St. Louis, VII, 1895, p. 43, pi. vn. 



*Maryarita (Unio) rectus LEA, Syn., 1836, p. 34; 1838, p. 23. 



*Margaron (Unio) rectus LEA, Syn., 1852, p. 35; 1870, p. 57. 



*Lampsilis rectus SMITH, Bull. U. S. Fish Com., 1899, p. 290, pi. LXXVIII. 



t* Unio latissima RAI INESQUE, Ann. Gen. Sci. Phys. Brnx., Pt. 13, V, 1820, p. 297, 

 pi. LXXX, figs. 14, 15. 



* lUnio prcelongus BARNES,' Am. .11. of Sci., VI, 1823, p. 261, pi. xm, fig. 11. 



* HILDRETH, Am. .11. of Sci., XIV, 1828, p. 286, fig. 18. 



* Mya prcelonga EATON, Zool. Text-Book, 1826, p. 220. WOOD, Ind. Test (Han- 



ley), 1856, p. 200, pi. i, Supp., fig. 11. 



* Knrynea pralonga STIMTSON, Shells of N. Eng., 1851, p. 13. 



t* Unio mgeri CONRAD, Mouog., VI, 1836, p. 53, pi. xxix. fig. 1. 



* tUnio arquatus- CONRAD, .11. Ac. Nat. Sci. Phila., 1854, p. 297. pi. xxvi, fig. 8. 



B. H. WRIGHT, Check List, 1888. 



Entire Mississippi drainage; Alabama River drainage; Red River of 

 the North ; St. Lawrence system. DeCamp's Unio anodontoides, reported 

 from Michigan, is a tawny colored variety of this species according to 

 Walker. 



(Group of Lampsilis nasutus.} 



Shell elongated, thin, compressed, with a distinct posterior ridge, and 

 drawn out to a long, pointed beak behind; epidermis rather dull, olive 

 green, and feebly rayed; beaks low, sculptured with fine, close set 

 ridges, which are slightly looped in front and are parallel with the axis 

 of the shell behind; hinge teeth delicate and compressed; nacre bluish; 

 female shell not greatly produced in the post-basal region. Animal 

 with the raarsupium often occupying the greater part of the length 

 of the outer gills posteriorly; inner gills free or united to the abdomi- 

 nal sac. 



fLAMPSILIS NASUTUS Say. 



Unio nasutus SAY, Nich. Encyc., 1st ed., 1816, pi. iv, fig. 1. * SWAINSON, Zool. 111., 

 Istser., 1,1821, pi. LVII. *CONRAD, New F. W. Shells, 1834, p. 70. *FERUSSAC, 

 Guerin Mag., 1835, p. 26.* CONRAD, Monog., IV, 1836, p. 38, pi. xvm, fig. 1, 



Barnes only gives an outline of his shell, which appears to me more like his U. 

 gibbosus than rectus. However in deference to the opinions of Hildreth, Lea, and 

 others, I place it in the synonymy of L. rectus. Hildreth's description answers fairly 

 well to rectns, and it was submitted to Barnes for his inspection. 



2 Lea believes this to be a distorted reclns. I am not quite certain of it. 

 Proc. N. M. vol. xxii 35 



