308 Records of the Indian Museum. [VoL. VII, 1912.] 
Proc, Ac. Nat. Sci., Philad., 1856, p. 300,—<Arconaia lanccolata, 
Conrad, Am. Jl. Conch., I, 1865, p. 234,—=Triquetra contorta, Lea, 
Proc. Ac. Nat. Sci., Philad., VIII, 1856, p. 300; Obs , VI, 1857, p. 
39, pl. xxxili, fig. 33,—Hyria contorta, Sowerby, Conch.) icon, 
XVII, 1869, pl. i, figs. 2a, 2b,—Margaron (Triquetra) contorta, 
Lea, Syn., 1870, p. 26,—Unio contortus, Heude, Conch. Fluy, 
Nank? 1897. plescyesae one 
Lake Tungling, China, Reg. No. #975. 
