1298 DU'I.ODON 



Margarita (Unio) australislxx, Syn., 1836, p. 25; 1838, p. 19. 

 Hyridella australis Svvainson, Tr. on Mai., 1840, p. 285. 

 Margaron (Unio) australis Le:a, Syn., 1852, p. 28; 1870, p. 44. 

 Diplodon australis vSimpson, Syn., 1900, p. 890. 

 f Unio depressus Lesson, \'oy. Coquille, 1830, II, p. 427, pi. 



XV. fig. 5. 

 Margarita (Unio) depressus Livv, Syn., 1836, p. 32; 1838, p. 



22. 

 Margaron (Unio) depressus Ij; \, Syn., 1852. p. 33 : 1870, p. 



54- 

 Unio ambignus Piiiiji'pi, Conch., Ill, 1847, p. 47, pi. iii, fig-. 2. 



— SowERBY, Conch. Icon., XYI, 1868, pi. lxix, fig. 355. 

 U7iio shuttleworthi KusTrR, Conch. Cal>. Unio, 1856, p. 152, 



pi. xi.iv, fig. 2. 

 Unio philippianus Kuster, Conch. Cab. Unio, t86i, p. 235. pi. 



LXXIX, fig. 2. 

 Unio balonnensis Conrad, Pr. Ac. N. Sci. Phila., W 1850, p. 



10; Jl. Ac. N. 'Sci. Phila., II, 1854, p. 295, pi. xxvr, fig. 3. 

 f Unio daniellii Villa. Jl. de Conch., XIX, 187 1, p. 328. 

 Unio bednalli Tatk. Where? 



Apparently an abimdant. widely distributed si)ecies, and 

 quite variable. The exterior is usually somewhat strongly 

 and irregularly sculptured, the epidermis is pale olive to brown- 

 ish, the teeth are small and sometimes almost feeble. 



A'ar. legrandi (Petterd). 



This form is larger than australis and in some cases a solider 

 shell. Two shells from Tasmania bearing the name Uiiio le- 

 grandi from Suter appear to be but a variety of australis. One 

 of them is obovate, quite solid and dark, the other is sub- 

 rhomboid, thinner and lighter colored. A third shell, which 

 is probablv this, is labeled "Australia" and is obovate and 

 rhomboid. 



Length 96, height 60, diam. 35 mm. 



Length 78, height 50, diam. 2>^ mm. 



Australia ; Tasmania. 

 Unio depressus Ri'EN'E, Conch. Icon., X\'I, 1864, ]il. win, fig.. 



81. 



