152 TJXiONiD.i:. 



Var. curvata, Preston, Eec. lud. Mus., Calcutta, vii, 1912, 

 p. 295. 



Shell having the ventral margin more curved, and generally 

 less ovate in shape than in the typical form. 

 Hah. Pegu. 

 Type in the Indian Museum. 



Section PSEUDODON. 

 Pseudodon, Gould. 1884. 



For characters and type see description of genus above. 

 Range. Siam and Indo-China ; Burma; China ; Java ; Sumatra ; 

 Borneo ; Malacca ; Nicobar Islands. 



286. Pseudodon (Pseudodon) inoscularis (Gould). 



Pseudodon (Pseudodon) inoscularis (Gould) ; Simpson, Washingiou, 

 D.C., Smiths. Iiist., Nat. Mus. Proc. xxii, 1900, p. 847. 



Ajiodon inoscidaris, Gould, Proc. Boston Soc. Nat. Hist, i, 1844, 

 p. 160 ; H. & T., C. I. p. 6, pi. 9, fig. 2. 



Mar(jaron {Monocondylcea) inoscularis, Lea, Syu. 1870, p. 73. 



Maryaritana inoscularis, Psetel, Conch. Sam. iii, 1800, p. 173. 



Original descrq^ion : — Testa transverse oblonga, sub-ovata, 

 solida, subventricosa, picea : umbonibus parum elevatis ; margiue 

 supra brevi, recto, ad angulum posticum rotuudato, postice sub- 

 truncato ; infra arcuata ; utraque valva processu cardiuali crassa, 

 dentiformi, iustructa, uuo ante altero aptante ; margarita albida ; 

 impressione musculari antico profundo. 



Long. 44, lat. 76, diam. 28 mm. 



Hah. Salweu Eiver, Burma ; Tenasserim (Indian Mus. Coll.). 



287. Pseudodon (Pseudodon) salwenianus (Gould). 



Pseudodon {Pseudodon) salwenianus (Gould) ; Conrad, Am. Journ. 



Conch, i, 1865, p. 233. 

 Anodon salwenianus. Gould, Proc. Boston Soc. Nat. Hist, i, 1844, 



p. 160. 

 Anodonta saliveniana, Gould, Otia Conch. 1862, p. 193. 

 Unio scdweniujius, Sowerby, Conch. Icon, xvi, 1868, pi. 94, fig. 513. 

 Margaron (Monocondyhea) sahceniana, Lea, Syn. 1870, p. 72. 

 Pseudodon sahcenianum, H. & T., C. 1. p. 5, pi. 9, fi^;. 4. 

 Monocondylcea sahceniana, Paetel, Conch. Sam. iii, 1890, p. 174. 



Original description: — Testa trapezoidea, compressa, subteuui, 

 retro dilatata, postice truncata, colore picea ; supra costam um- 

 bonalem radiatim plicata : umbonibus parum elevatis ; margine 

 superiori recta, compressa, ligamentum occultante, ante umbonibus 

 excavata ; utraque valva processu dentiformi cardinali, uno ante 

 altero aptante, instructa ; cavitate minime profunda ; impres- 

 siouibus muscularibus minime im])ressis ; margarita sub-livida. 



