NO 1205. SYNOPSIS OF THE NAIADES- SIMPSON. 893 



* Marf/aron ( Unio) cvansi LEA, Syn., 1870, p. 56. 



* Margaritana evansi P.ETKL, Conrh. Sara., Ill, 1890, p. 173. 



Murray Eiver, Australia 



Section CUCTJMERIA Conrad, 1853. 

 (Type, Unio novai-hollandia; Gray.) 



Shell elongated, trapezoidal, widest behind; pseudoeardinals irregu- 

 lar, small, not well developed, showing a tendency to break into denti- 

 cles; laterals feeble; pal lial line strongly pitted; nacre much thicker in 

 front. 



(Group of Diplodon novce-liollandice.) 



Shell having the posterior two thirds covered with irregular nodules, 

 which radiate somewhat from the posterior ridge. 



fDIPLODON NOV^-HOLLANDI^ Gray. 



*Unio nora'-hollandia> GRAY, Pr. Zool. Soc. Lond., 1834, p. 57. *MOLLER, Syn. 



Nov. Gen., 1836, p. 197. *HANLEY, Test. Moll., 1842, p. 182; *Biv. Shells, 1843, 



p. 182. *CATLOW and REEVE, Conch. Nora., 1845, p. 61. *H. aud A. 



ADAMS, Gen. Eec. Moll., II, 1857, p. 496. *P.ETEL, Conch. Sam., Ill, 1890, 



p. 161. 

 * Margarita ( Unio) norcc-hollandi LEA, Syn., 1836, p. 17; 1838, p. 16. 



* Margaron (Unio) nova'-hollandin; LEA, Syn., 1852, p. 23; 1870, p. 35. 



* \Unio cucnmoides LEA, Proc. Am. Phil. Soc., 1840, p. 285; *Tr. Am. Phil. Soc., 



VIII, 1842, p. 192, pi. vii, fig. 2; *Obs., Ill, 1842 p. 30, pi. vn, fig. 2. 'HAN- 

 LEY, Biv. Shells, Sup., 1856, p. 382, pi. xxiv, fig. 4.* H. and A. ADAMS, Gen. 

 Rec. Moll., II, 1857, p.497. *CiiENU, 111. Conch., 1858, pi. xxvn, figs. 3, 3a, 

 3b. * KUSTER, Conch. Cab. Unio, 1861, p. 219, pi. LXXIV, fig. 1.* REEVE, 

 Conch. Icon., XVI, 1865, pi. xix, fig. 89. *P.ETKL, Conch. Sam., Ill, 1890, 

 p. 149. 



* Margaron (Unio) cucumoides LEA, Syn., 1852, p. 21; 1870, p. 31. 



* fUnio cnmingianus DUNKER, Zeits. fur Mai., 1853, p. 53. 



Australia. 



(Group of Diplodon shuttleworthii.) 



Beak sculpture consisting of strong, irregularly radiate, curved, 

 nodulous bars; surface of shell somewhat sulcate, but not nodulous. 



t DIPLODON SHUTTLEWORTHII Lea. 



'UniosJiuttlfworttiiiL.KA, Pr. Ac.N. Sci. Pbila., VIII, 1856, p. 94; *J1. Ac. N. Sci. 

 Phila., Ill, 1857, p. 304, pi. xxvin, fig. 19; VI, 1857, p. 24, pi. xxvm, fig. 19. 

 * SOWERBY, Conch. Icon., XVI, 1866, pi. xxxn, fig. 167. 



*Margaron ( Unio) shuttlewortliii LEA, Syn., 1870, p. 36. 



*?(Jnio miitaMlis REEVE, Conch. Icon., XVI, 1865, pi. xxiv, fig. 112. 



*Unio angasi SOWERBY, Conch. Icon., XVI, 1867, pi. i/v, fig. 282. 



*Margaritana attgasi P/ETEL, Conch. Sam., Ill, 1890, p. 172. 



*Aitodonta aiigasi P^ETEL, Conch. Sain., Ill, 1890, p. 176. 



Australia. 



