287 
ringeren Höhe des Hinterrandes, der stärkeren Schale und der grösseren Bauchigkeit ge- 
nügende Unterschiede voraussetzen kann. Bis es mir möglich ist, festländische Stücke der 
Art zu prüfen, lasse ich die javanische Form einstweilen noch bei ihr. 
6. Physunio gravidus Lea. 
Taf. 35, Fie. 1. 
Unio gravidus Lea, Proc. Acad. Nat. Sciences, Vol. 8, 1856, p. 93; Observations, Vol. 6, 
\ 1857, p. 12, Taf. 24, fig. 5. — Journ. Acad. Nat. Sciences, Vol. 3, 1858, 
p. 292, Taf. 24, fig. 5. — v. Martens, Proc. Zool. Soc. London, 1860, 
p- 14. — Sowerby in: Reeve, Conch. Ieonica, Vol. 16, 1866, Taf. 52, 
fig. 271, — Morelet, Series Conchyliologiques, Teil 4, 1875, p. 347. — 
L. Morlet, Journ. de Conch., Vol. 37, 1889, p. 163. — Paetel, Katalog 
Conch. Samml., Vol. 3, 1890, ». 154. — P. Fischer, Bull. soc. hist. nat. 
Autun, Vol. 4, 1891, p. 139. — Blanford, Proc. Malac. soe. London, 
Vol. 5, 1903, p. 283. — H, Fischer & Dautzenberg, Mission Pavie 
Indochine, Vol, 3, 1904, p. 438. 
Margaron (Unio) gravidus Lea, Synopsis, 1870, p. 28. 
Lampsilis gravidus Rochebrune, Bull. soc. philomathique Paris, Vol. 6, 1881, p. 43, 
Physunio gravidus Simpson, Synopsis, 1900, p. 830. — Preston, Records Indian Mus. 
Caleutta, 1912, Vol. 7, 1912, p. 293. 
Unio abnormis Morelet, Revue et Magazin de Zoologie, Vol. 14, 1862, p. 480. 
Unio superbus Sowerby in Reeve, Conch. Iconica, Vol. 16, 1867, Taf. 59, fig. 29. 
Testa alata, triangulari, valde inflata, valde inaequilaterali,; valvulis tenuibus; nati- 
dus elevatis, tumidis; epidermide lutea, nitida,; dentibus cardinalibus praelongis, valde 
lamellatis; _lateralibus longis, lamellatis subcurvisque; margarita coeruleo - alba et iri- 
descente. 
Shell winged, smooth, triangular, very much inflated, very inequilateral; substance of 
the shell thin, thinner behind; beaks elevated, very much inflated and undulate at the tip, 
in a double row with small striae on each side; ligament rather long and thin; epidermis 
yellowish, inelined to olive, shining, with three obscure rays on the posterior slope; cardinal 
teeth very long, lamellar, double in the richt and single in the left valve; lateral teeth 
long, lamellar and slightly curved; anterior cicatrices confluent; posterior cicatrices con- 
fluent; dorsal eicatrices concealed within the cavity of the beaks; cavity of the shell large, 
deep and. rounded; cavity of the beaks very deep and rounded, nacre bluish white and 
iridescent. 
Diam. 1,9, Lensth 2,4, Breadth 3,2 inches. 
Hab. Siam. S. R. House, M. D. 
