t^^l

152 TKIONIDiE.
Var. curvata, Preston, Eec. lud. Mus., Calcutta, vii, 1912,
p. 295.
Shell having the ventral margin nioi'e curved, and generally
less ovate in shape than in the typical form.
Hab. 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, Washington,
D.O., Smiths. Inst., Nat. Mus. Proc. xxii, 1900, p. 847.
Anodon inoscularis, Gould, Proe. Boston Soc. jVat. Hist, i, 1844,
p. 160; II. & T., C. 1. p. 5, pi. 9, fig. 2.
Margaron (Monocondylcea) inoscularis, Lea, Syn. 1870, p. 73.
Margaritana inoscularis, Psetel, Conch. Sam. iii, 1890, p. 173.
Original description :—Testa transverse oblonga, sub-ovata,
solida, subventricosa, picea : umbonibus parum elevatis; margiue
supra brevi, recto, ad angulum posticum rotundato, postice subtruncato;
infra arcuata; utraque valva processu cardinali crassa,
dentiformi, instructa, uno ante altero aptante ; margarita albida ;
impressione musculari antico profurido.
Long. 44, lat. 76, diam. 28 mm. \
Hai. Salvven Eiver, Burma ; Tenasserim (Indian Mus. Coll.).
287. Pseudodon (Pseudodon) salwenianus (Goidd).
Pseudodon (Pseudodon) salivenianus (Gould) ; Conrad, Am. Journ.
Conch, i, 1865, p. 233.
Anodon salioeniamis, Gould, Proc. Boston Soc. Nat. Hist, i; 1844,
p. 160.
Anodonta sahveniana, Gould, Otia Conch. 1862, p. 193.
Unio sahcenianus, Sowerby, Conch. Icon, xvi, 1868, pi. 94, fig. 513.
Margaron (Monocondylcea) salweniana, Lea, Syn. 1870, p. 72.
Pseudodon saltvenianum, II. & T., 0. I. p. 6, pi, 9, fig. 4.
Monocondylcea sahoeniana, Psetel, Conch. Sam. iii, 1890, p. 174.
Original description:—Testa trapezoidea, compressa, subtenui,
retro dilatata, postice truncata, colore picea; supra costam umbonalem
radiatim plicata: vimbonibus parum elevatis ; margine
superiori recta, compressa, ligamentum occnltante, ante umbonibus
excavata; utraque valva processu dentiformi cardinali, uno ante
altero aptante, instructa; caTitate minime profunda; impressionibus
muscularibus minime imj^ressis ; margarita sub-livida.