NO. 1205. SYNOPSIS OF THE NAIADES SIMPSON. 789 



Conch. Norn., 1845, p. 57. *KUSTER, Conch. Cab., 1852, p. 49, pi. x, fig. 2. 

 *CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 247. *H. and A. ADAMS, Gen. 

 Kec. Moll., II, 1857, p. 492. *CHENU, 111. Conch., 1858, pi. xxv, figs. 4, 4a, 

 46. * SOWERBY, Conch. Icon., XVI, 1868, pi. xciv, fig. 512. *CALKINS, Pr. 

 Ottawa Acad. Sci., I, 1874, p. 42. *B. H. WRIGHT, Check List, 1888. 

 *P,ETEL, Conch. Sam., Ill, 1890, p. 148. 



* Margarita ( Unio) coccineus LEA, Syii., 1836, p. 34; 1838, p. 23. 



* Margaron ( Unio) coccineus LEA, Syn., 1852, p. 35; 1870, p. 56. 



* Quadrula coccinea BAKER, Moll. Chicago, Pt. 1, 1898, p. 79, pi. xiv, fig. 1 ; xix, 



fig. 3. 



* Unio rubens MENKK, Syn., Meth. Moll., 1828, p. 90. 



* Unio catillus CONRAD, Monog., Ill, 1836, p. 30, pi. xm, fig. 2." KUSTER, Conch. 



Cab., 1852, p. 64, pi. xv, fig. 2.* CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, 

 p. 246. *P2ETEL, Conch. Sam., Ill, 1890, p. 147. 



* Unio catilus B. H. WRIGHT, Check List, 1888. 



* Unio gouldianus WARD, l Jay's Catalogue, 3d ed., 1839, p. 24. 



* Unio cuneus CALL, Tr. Ac. Sci. St. Louis, VII, p. 14. 



fQUADRULA COCCIENEA var. PAUPERCULA Simpson. 2 



Entire Upper Mississippi drainage; St. Lawrence basin in various 

 localities. The peculiar dwarf variety which is found in this latter 

 area seems almost entitled to specific rank. 



tQUADRULA SOLIDA Lea. 



Unio solidus LEA, Tr. Am. Phil. Soc., VI, 1838, p. 13, pi. v, tig. 13; *Obs., II, 1838, p. 

 13, pi. v, fig. 13. *TROSCHKL, Arch, fur Naturg., V, 1839, Pt. 2, p. 234. 

 *HANLEY,Test. Moll., 1842, p. 186; *Biv. Shells, 1843, p. 186, pi. xxm, fig. 15. 

 * C ATLOW and REE VE, Conch. Nom., 1845, p. 64. *H. and A. ADAMS, Gen. 

 Kec. Moll., II, 1857, p. 496. *CHENU, 111. Conch., 1858, pi. xxv, figs. 2, 2a, 

 26. * KUSTER, Conch. Cab., 1861, p. 258, pi. LXXXVII, fig. 4.* REEVE, 

 Conch. Icon., XVI, 1865, pi. xxvn, iig. 133. * CALKINS, Pr. Ottawa Acad. 

 Sci., 1874, p. 45. *B. H. WRIGHT, Check List, 1888. *RKTEL, Conch. Sam., 

 Ill, 1890, p. 168. 



* Margarita ( Unio) solidus LEA, Syn., 1836, p. 20; 1838, p. 17. 



* Margaron ( Unio) solidus LEA, Syn., 1852, p. 25 ; 1870, p. 38. 



* ? Unio cardiacea DESIIAYES, Tr. Elem. de Couch., 1839, p. 19, pi. xxxi, figs. 1, 2. 



* Uniofulgidus LEA/' Pr. Am. Phil. Soc., IV, 1845, p. 164 ; *Tr. Am. Phil. Soc., X, 1848 



p. 73, pi. iv, fig. 10; *0bs., IV, 1848, p. 47, pi. iv, fig. 10. * CONRAD, Pr. 

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

 1857, p. 495.* B. H. WRIGHT, Check List, 1888." P^KTEL, Couch. Sam., Ill, 

 1890, p. 253. 



* Margaron ( Unio) fulgidus LEA, Syn., 1852, p. 25; 1870, p. 38. 



* Unio obovalis CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 253. 



Ohio, Cumberland, and Tennessee river systems; south to Louisiana; 

 west to Arkansas and Kansas; north to Minnesota; east, through Wis- 

 consin, Illinois, and Indiana, to Ohio. 



1 Adopted by Dr. Jay and used in his catalogue, but never described. It is a white 

 nacred coccinea. 



2 There is a dwarf form, greatly inflated and having the rest periods very plainly 

 marked, found in the St. Lawrence and its tributaries near the Niagara Falls, which 

 may bear the above varietal name. 



rt There is only the type, a young shell, in Lea's collection, and I have no hesitation 

 in referring it to solidus. 



