NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 789 



Couch. 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, 

 Eec. 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.— 

 *PyETEL, Conch. Sam., Ill, 1890, p. 148. 



* Margarita ( Unio) coccineus Lea, Syn., 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. 



* ?7mo rw&ews Menke, Syn., Meth. Moll., 1828, p. 90. 



* Unio catillus Conrad, Monog., Ill, 1836, p. 30, pi. xiii, fig. 2.—* Kuster, Couch. 



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

 p. 246.— *P«tel, Conch. Sam., Ill, 1890, p. 147. 



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



* Unio goiildianus Ward, '■ Jay's Catalogue, 3d ed., 1839, p. 24. 



* Unio cuneiis Call, Ti*. Ac. Sci. St. Louis, VII, p. 14. 



t QUADRULA COCCIENEA var. PAUPERCULA Simpson.^ 



Entire Upj)er Mississippi drainage^ St. Lawrence basin in various 

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

 area seems almost entitled to specific rank. 



t QUADRULA SOLIDA Lea. 



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

 13, pi. V, fig. 13.— *Troschel, Arch, fiir Naturg., V, 1839, Pt. 2, p. 234.— 

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



* C ATLOW and Eeeve, Couch. JSTom., 1845, p. 64. — *H. and A. Adams, Gen. 

 Eec. Moll., II, 1857, p. 496.— "Chenu, 111. Conch., 1858, pi. xxv, figs. 2, 2a, 

 2b. — * Kuster, Conch. Cab., 1861, p. 258, pi. lxxxvii, fig. 4. — * Eeeve, 

 Conch. Icon., XVI, 1865, pi. xxvii, fig. 133. — "" Calkins, Pr. Ottawa Acad. 

 Sci., 1874, p. 45.— *B. H. Wright, Check List, 1888.— "^PiETEL, 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. 

 " ? U7iio cardiacea Deshayes, Tr. Elem. de Couch., 1839, p. 19, pi. xxxi, figs. 1, 2. 



* UniofulgidusJ^¥.A,^ Pr. Am. Phil. Soc, IV, 1845, p. 164; '^Tr. Am. Phil. Soc, X, 1848 



p. 73, pi. IV, fig. 10; *Obs., IV, 1848, p. 47, pi. iv, fig. 10.— * Conrad, Pr. 

 Ac. N. Sci. Phila., VI, 1853, p. 249.— *H. and A. Adams, Gen. Eec. Moll., II, 

 1857, p. 495.—* B. H. Wright, Check List, 1888.— * P^tel, Conch. Sam., Ill, 

 1890, p. 253. 



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



* Unio ohovalis 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. ' 



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

 nacred coccinea. 



-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. 



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

 in referring it to solidus. 



