NO. 1205. SYNOPSIS OF THE KAIADES—SIMPSOm 887 



fDIPLODON DISCULUS Lea. 



* Unio disculus, Lea, Pr. Ac. N. Sci. PhiLo,., IV, 1860, p. 91; * Jl. Ac. N. Sci. Phila., 



V, 1863, p. 385, pi. XLiv, fig. 293; * Obs., X, 1803, p. 21, pi. xliv, fig. 293. 

 * Margaron Unio discuhisLiKA, Syn., 1870, p. 55. 



Uruguay River, Soutli America. 



tDIPLODON FUNEBRALIS Lea. 



* Unio funehralis Lea, Pr. Ac. N. Sci. Phila., IV, 1860, p. 91 ; * Jl. Ac. N. Sci. Phila., 



V, 1863, p. 378, pL xli, fig. 286; * Obs., X, 1863, p. 14, pi. xli, fig. 286.— 

 *SowERBY, Conch. Icon., XVI, 1867, pi. Lvii, fig. 290. — *P^tel, Conch. 

 Sam., Ill, 1890, p. 153. 



* Margaron Uniofaitebralls Lea, Syn., 1870, p. 55. 



Uruguay River. 



tDIPLODON PARANENSIS Lea. 



* TJnio jyaranensis Lea, Tr. Am. Phil. Soc, V, 1834, p. 49, pi. xiv, fig. 42. — * Obs., I, 



1834, p. 211, pi. XIV, fig. 42.— ^Hanley, Test. Moll., 1842, p. 202; *Biv. 

 . Shells, 1843, p. 202, pi. xxi, fig. 3.— *d'Orbigxy, Voy. Am. Mer., 1843, p. 

 603. — *Catlow and Eeeve, Conch. Nom., 1845, p. 62. — "^ H. and A. Adams, 

 Gen. Eec. Moll., II, 1857, p. 492.— ^Kuster, Conch. Cab., 1861, p. 253, pi. 

 Lxxxv, fig. 3. — * SowERBY, Conch. Icon., XVI, 1866, ^l. Li, fig. 268; * P^etel, 

 Conch. Sam., Ill, 1890, p. 162. 



* Margarita ( Unio) paranensis Lea, Syn., 1836, p. 33; 1838, p. 23. 

 *'^largaron {Unio) paranensis Lea, Syn., 1852, p. 34; 1870, p. 55. 



*t Unio noctiirnus Lea, Pr. Ac. N. Sci. Phila., IV, 1860, p. 91; * Jl. Ac. K Sci. 

 Phila., V, 1863, p. 380, pi. xlii, fig. 288 ; * Obs., X, 1863, p. 16, pi. xlii, fig. 288. 

 ^Margaron ( Unio) nocturnus Lea, Syn., 1870, p. 56. 



Uruguay aucl Parana rivers. 



Section BULLOIDEUS Simpson, 1900.' 

 (Type, Unio huUoides Lea.) 



Shell rounded, inflated, thin, nearly equilateral, truncate behind and 

 slightly so before, with a rather sharp posterior ridge and a dorsal 

 wingj beaks full, rather high, regularly radial; epidermis smooth, 

 bronzy olive; pseudocardinals compressed, much elongated, disposed 

 to be split into denticles, two in the right valve and one in the left; 

 laterals two in the left valve and one in the right; dorsal scars few and 

 scattered in the rather shallow cavities; nacre bluish. 



tDIPLODON BULLOIDES Lea. 



* Unio buUoides Lea, Pr. Ac. N. Sci. Phila., Ill, 1859, p. 187; * Jl. Ac. N. Sci. Phila., 



IV, 1860, p. 264, pi. xlii, fig. 144; ' Obs., VII, 1860, p. 82, pi. i.xii, fig. 144.— 

 *Kuster, Conch. Cab. Unio, 1861, p. 186, pi. lix, fig. 2. — *Sowerby, Conch. 

 Icon., XVI, 1868, pi. lxxxviii, fig. 275.— 'PiETEL, Conch.Sam.,III,1890,p. 146. 

 Margaron ( Unio) hulloides Lea, Syn., 1870, p. 55. 



Rio de la Plata. 



tDIPLODON SOLISIANUS d'Orbigny. 



* Unio soUsiana d'Orbigny, Guer. Mag., 1835, p. 35; * Voy. Am. Mer., 1843, p. 604, 



pi. LXix, figs. 1-3.— *SowERBY, Conch. Icon., XVI, 1868, pi. xciii, fig. 508. 



Rio de la Plata and its affluents. 



