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LAMELLIDENS. 187<br />
312. Lamellidens exanthematicus {Kihtei-).<br />
Lamellidens exanthematicus (Kiister); Simpson, Washington, D.O.,<br />
Smitlis. Inst., Nat. Mus. Proc. xxii, 1900, p. 856.<br />
Unio exanthematicus, Kiister, Conoli. Cab., Unio, 1861,' p. 243,<br />
pi. 81, fig. 2; Pastel, Conch. Sam. iii, 1890, p. 152.<br />
Original description:—Testa transversa, subovata, convexa,<br />
tenuis flava, fusceseenti-annulata, postice viridi-radiata, subtiliter<br />
striata, subtilissime pustulata, pustulis numerosis, majoribus<br />
minoribusque mixtis ; umbonibus promiriulis ; area subtrigona,<br />
compressiuscula; dentibus cardinalibus parvis, minus elevatis, in<br />
valvula utraque duplicibus, lamellis longis, curvatiusculis ; margarita<br />
carneo-alba et iridescente.<br />
Long. 26, lat. 43, diam. 13-5 mm.<br />
Hob. East Indies.<br />
313. Lamellidens canefrianus, Simjison.<br />
Lcinullidens canefrianus, Simpson, Washington, 1X0., Smiths. Inst.,<br />
Nat. Mus. Proc. xxii, 1900, p. 857.<br />
XJnio protensus, Tapparone-Oanefri, Ann. Mus. Civ. St. Nat. Geneva,<br />
vii, 1889, p. 349.<br />
Original description:—Testa transverse oblonga, injequilaterali,<br />
postice subbiangulata, inter angnlos truacata et in rostrum<br />
abbreviatum attenuata, margine ventrali modice arcuato et ad<br />
rostrum sinuate, umbonibus late decorticatis. Superfices valvarum<br />
epidermide- Ifflvi, intense fusea in adultis, viridi-olivacea<br />
in junioribus induta, zona marginal! pallidiore inferne ornata.<br />
Dentes cardinales tenues, in valva dextera duo raajusculi,<br />
laciniato-striati, margine denticulati, in valva sinistra unicus,<br />
tenuior, ultra medium subacutus. Margarita argentea, postice<br />
vivide iridescens; superficies interna valvarnm ssDpius plus<br />
minusve margaritifera.<br />
1. 2.<br />
Long 89 65 mm.<br />
Lat.,. .• 44 34 mm.<br />
Diam 27 18 mm.<br />
Hah. Prome, Lower Burma (i. Fea).<br />
314. Lamellidens narainporensis, Preston.<br />
Lamellidens narainporensis, Preston, llec. Ind. Mus., Calcutta, yii<br />
1912, pp. 305-306.<br />
Original description:—Shell cuneate, moderately convex, posteriorly<br />
rostrate, dark reddish-brown, covered towards the margins<br />
with a finely laminiferous periostracum, marked with concentric<br />
lines of growth, bearing two carinie on each valve running from<br />
the umboA ^ in a dorsallj posterior direction; umbones small,<br />
not promiiLiit, somewhat coarsely corrugated; dorsal margin
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