— 214 — 



1845. — nodulosa — Catlow and Reeve. Conch. Nom., p. 61. 



1852. Margaron (Prisodon) nodulosus W. Lea, Synopsis, p. 22. 



1856. Mya nodulosa Wood, Index testac. Rev., p. 16, pi. II, 



fig. 29. 



1857. Unio nodulosus Wood H. et A. Adams, Gênera of rec. Moll., II, 



p. 496. 

 1862. — grandidens Lea, Proc. Acad. N. Se. Philad., p. 168. 



1862. — — Lka, Journ Arad. N. Se. Phiiad.. V, 



p. 20r., pi. XXX, iig. 274. 



1863. — — Lea, Obs. G. Unio, IX, p. 27, pi. 30, 



fig. 274. 

 1868. — nodulosus Wood Sowerby, in Reeve, Conch. Icon., 



pi. LXXXIII, lig. 439. 

 1870. — [Prisodon) — — Lea, Synopsis, p. 27. 

 1870. Margaron (Unio) grandidens Lea, Synopsis, p. 34. 

 1890. Unio nodutosus Wood Paetel, Catal. Conch. Samml., IIF, p. 161. 

 1900. Quadrula nodulosa — Simpson, Synops. of the Naiades, p. 798. 



Loc: Song Bang-Giang, à Cao-Bang (M. Mausuy). 



Unio (Quadrula) Mansuyi nov. sp. 

 (Pi. vin, 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 lalidioribus ac divaricanti- 

 bus ornata. Umbones contigui, valde erosi. Pagina interna 

 margaritacea, parum nitida, sub lente minutissime granulosa. 

 Cardo perincrassatus, in valva dextra dentés cardinales duo 

 laciniatos, antico quam postico multo wlidiore, dentemque 

 lateralem posticum unicum crassumque ; in calva sinistra 

 dentés cardinales duo laciniatos, postico quam antico vali- 

 diore, dentesque latérales duo a sulco profundo sejunctos prae- 

 bet. In utraque valva dentés latérales a margine recedunt. 

 Impressiones musculares conspicuae, rotundatae ; impressio 

 pallii intégra, antrorsum ascendit et a margine recedit. 

 Margo integer et acutus. 



Color, sub epidermide fusco, albus ; margarita alba, vix 

 iridescens. 



