PIPr.ODON 



1257 



DiPi^ODON cniLENSis (Gray). 



Shell long elliptical, siibrhomboid or slightly ohovate, scarce- 

 ly subsolid. subcompressed, inequilateral ; beaks neither full 

 nor elevated, sculptured with delicate, narrow, radial ridges; 

 posterior ridge almost wanting, ending behind in a wide, 

 rounded point below the median line ; surface with delicate, 

 concentric sculpture ; epidermis greenish or greenish-olive, 

 shining ; teeth delicate, compressed ; left valve with one pseu- 

 docardinal and two laterals; right valve with two pseudocar- 

 dinals and one lateral ; nacre bluish or purplish, generally 

 bright and iridescent. 



Length 66, height 33, diam. 19 mm. 

 Length 57, height 32, diam. 16 mm. 

 Island of Chiloe, Chile. 

 Unio chilcnsis Gray, Spic. Zool., 1828, pi. vi, fig. 12. — Phil- 

 ippi. Conch., HI, 1847, p. 9, pi. IV, fig. 2. — KusTER, Conch. 

 Cab. Unio, 1862, p. 282, pi. xcv, fig. 12. — Sowerby, Conch. 

 Icon., XVL 1867, pi. JA'i, fig. 286. 

 Diplodon chilensis Simpson, Syn., 1900. p. 880. 

 Unio smithii Gray and Pidgkon, Grifif. Cuv., XII, 1834, p. 

 600, pi. XX. fig. 3. — Hani.ey, Biv. Shells, 1843, P- 195- P'- 

 xxiii^ fig. 58. 

 Margarita (Unio) smithii Lea, Syn.. 1836, p. 27; 1838, p. 20. 

 Margaron (Unio) smithii Lka, Syn., 1852, p. 30; 1870, p. 48. 

 Unio aiiratiis Phieippi, Conch., IH, 1847. P- 9' pl- iv, fig. i. 

 Margarita fUnio) auratus Lea, Syn.. 1836, p. 31 ; 1838, p. 22. 

 Margaron fUnio) auratus Lea, Syn., 1852, p. 33; 1870, p. 53. 

 Unio araucanns Piiii.tppi. Conch., IH, 1847, P- 50» P^- iv, fig. 

 3. — KiJSTER, Conch. Cab. LTnio, 1862. p. 283, pi. xcv, fig. 3. 

 Margaron (Unio) araucanns Lea, Syn., 1870, p. 53. 

 Unio arancana FIupe, Gay's Hist. Chile, 1854, p. 317. 

 Unio cascrManccc Philippi, Zeitz. fiir Mai., V, 1848, p. 176. 

 Unio casablanccc Pfei^i^ER, Nov. Conch., IIL 1869, P- 481. pi- 



CIV, figs. I. 2. 

 Margaron (Unio) casablanccc Lka, Syn., 1870, p. 53. 

 Dij^lodon cascvhlanccc Simpson. Syn., T900, p. 882. 

 Unio fragilis Sowerry, Conch. Icon., XVI, 1856, pi. xxx, fig. 



LS5- ^ : ' ' ' 



