Ra sh *! 
— 214 — 
1845. — nodulosa — CatLtow and Reeve, Conch. Nom., p. 64. 
1852. Margaron (Prisodon) nodwlosus W. Lea, Synopsis, p. 22. 
1856. Mya nodulosa Woop, Index testac. Rev., p. 46, pl. II, 
fig. 29. 
1857. Unio nodulosus Wood H. et A. Apams, Genera of rec. Moll., II, 
p. 496. 
1862. — grandidens Lra, Proc. Acad. N. Sc. Philad., p. 168. 
1862. — _ Lea, Journ. Acad. N. Se. Philad., V, 
p. 205, pl. XXX, fig. 274. 
1863. — — Lea, Obs. G. Unio, IX, p. 27, pl. 30, 
fig. 274. 
4868. — mnodulosws Wood Sowersy, in Reeve, Conch. Icon., 
pl. LXXXIII, fig. 439. 
{870. — (Prisodon) — — _ Lea, Synopsis, p. 27. 
4870. Margaron (Unio) grandidens Lea, Synopsis, p. 34. 
1890. Unio nodulosus Wood Paeret, Catal. Conch.Samml., III, p. 164. 
1900. Quadrula nodulosa — Simpson, Synops. of the Naiades, p. 798. 
Loc.: Song Bang-Giang, a Cao-Bang (M. Mansuy). 
Unio (QuADRULA) MANSUYI NOV. sp. 
(Pl. VII, fig. 5.) 
Testa crassissima et ponderosa, oblongo-trapezoidalis, an- 
tice rotundata, postice declivis et angulata, striis incrementi 
irregularibus plicisque aliquot ab umbonibus radiantibus, in 
medio subrectis postice vero multo validioribus ac divaricanti- 
bus ornata. Umbones contigui, valde erosi. Pagina interna 
margaritacea, parum nitida, sub lente minutissime granulosa. 
Cardo perincrassatus, in valva dextra dentes cardinales duo 
laciniatos, antico quam postico multo validiore, dentemque 
lateralem posticum unicum crassumque; in valva sinistra 
dentes cardinales duo laciniatos, postico quam antico vali- 
diore, dentesque laterales duo a sulco profundo sejunctos prae- 
bet. In utraque valva dentes laterales a margine recedunt. 
Impressiones musculares conspicuae, rotundatae ; impressio 
pallii integra, antrorsum ascendit et a margine recedit. 
Margo integer et acutus. 
Color, sub epidermide fusco, albus ; margarita alba, vir 
iridescens. 
