152 TJNIONIDJB. 



Var. curvata, Preston, Rec. Ind. Mus., Calcutta, vii, 1912, 

 p. 295. 



Shell having the ventral margin more curved, and generally 

 less ovate in shape than in the typical form. 

 Hob. 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 ; Mcobar Islands. 



286. Pseudodon (Pseudodon) inoscularis (Gould). 



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

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



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

 p. 160 ; H. & T., C. I. p. 5, pi. 9, fig. 2. 



Maryaron (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 sub- 

 truncato ; infra arcuata ; utraque valva processu cardinal! crassa, 

 dentiformi, instructa, uno ante altero aptante ; margarita albida ; 

 impressione musculari antico profundo. 



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



Hob. Salwen Kiver, 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 salweniana, Gould, Otia Conch. 1862, p. 193. 

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

 Margaron (Monocondylcea) salweniana, Lea, Syn. 1870, p. 72. 

 Pseudodon salwenianum, H. & T., C. I. p. 5, pi. 9, fig. 4. 

 Monocondylcea salweniana, Psetel, Conch. Sam. iii, 1890, p. 174. 



Original description : Testa trapezoidea, compressa, subtenui, 

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

 bonalem radiatirn plicata : umbonibus parum elevatis ; margine 

 superior! recta, compressa, ligamentum occultante, ante umbonibus 

 excavata ; utraque valva processu dentiformi cardinali, uno ante 

 altero aptante, instructa ; cavitate minime profunda ; impres- 

 sionibus muscularibus rninime impressis ; margarita sub-livida. 



