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194 UNIOi'IDyT.
Unio frar/iliK, Nevill, J. A. S. B. xlvi, 1877, p. 39; Anderson
Yunnan Exp. 1877, p. 400, pi. 80, figs. 8-12.
Original deseri2}tion:—Testa oblonga, transversa, compressa,
tenui, fragili, insequilaterali, luteo-rvibiginosa, ad apicem decorticata
et striis granulosis divavicatis ornata; umbonibus minimis,
obtusis, vix proeminentibus; latere antico obtuso, paiilo angustiori;
latere postico latiori, oblique truncato, striis numerosis,
subsequalibus, arcuatis, ab angulo postico nascentibus ornate;
margine cardinali brevi, angusto, in valvula dextra dente cardinal!
minimo, obliquo, simplici, vix proeminenti, dente laterali postico
elongato, angustissimo ; in altera valvula dentibus cardinalibus
duobus, insequalissimus, divaricatis, dente postico angusto profunde
et angustissime bifido.
Long. 18, lat. 32, diam, 10 mm.
Sab. Cambodia.
Var. zayleymanensis (Nevill, MS.); Preston, Eec. Ind. Mus.,
Calcutta, vii, 1912, p. 307.
Original description:—Shell tliinner and smaller than the typical
form, more produced anteriorly and much more obtuse posteriorly;
the slight curve in the ventral margin is also absent.
Hab. Bhamo {Br. J. Anderson); there are also specimens in the
Indian Museum from Zayleyman {Anderson) and Bhamo.
Type in the Indian Museum.
319. Trapezoideus misellus {Morelet).
Trapezoideus misellus (Morelet) ; Simpson, Washington, D.O.,
Smiths. Inst., Nat. Mus. Proc. xxii, 1900, p. 859.
Unio misellus, Morelet, Journ. de Conch., Paris, xiii, 1865, p. 21;
Ser. Conch, iv, 1875, p. 841, pi. 14, fig. 2; Peetel, Conch. Sanu
iii, 1890, p. 159.
Unio siamensis, Lea, Proc. Acad. IVat. Sci. Philadelphia, x, 1866,
p. 133; Journ. Acad. Nat. Sci. Philadelphia, vi, 1868, p. 279,
pi. 38, fig. 93; Obs. (^ienus Unio, xii, 1869, p. 39, pi. 38,
fig. 93.
Margaron (Unio) simnensis, Lea, Syn. 1870, p. 57.
Original description :—Testa transversa, depressa, injequilateralis,
tenuis, epidermide lamelloso-striata, luteo-virenti, progressu
temporis fuscescentg, vestlta; margo anterior attenuatus,
posterior dilatatus, inferior medio sinuatus; umbones |)arvi,
depressi, aeuti, plerumque decorticati; dens cardinaHs lamelliformis,
exilissimus, in adultis obsoletus ; lamellae in utraque valva
parvulae, simplices; testa.interna insequaliter sulcata vel malleafaj
margarita pluihbea, squalida, sul) umbonibus late rubigineo tincta.
Long. 28, lat. 61, diam. 16 mm.
ffaV. Siam. Eepresented in the Indian Museum by specimens
from Tenasserim, and the Irrawaddy Elver at Sagaing {J. Coggin
Broivn).