NO. 1205. SYNOPSIS OF THE NAIADES SIMPSON. 805 



or left; beaks rather high, anterior; beak sculpture apparently a few 

 coarse, subparallel nodular ridges curved up behind; posterior ridge 

 low, close to the hinge line, and in front of it the shell is full; surface 

 slightly, irregularly, concentrically striate; epidermis dark, having a 

 peculiar, dull, silky luster; hiuge rather narrow; pseudocardinals two 

 in the left valve immediately under the beak, the anterior compressed, 

 high and nearly parallel with the outer edge of the shell, the posterior 

 heavy, joined to the anterior above, with a deep, triangular cavity 

 between; right valve with one large, triangular, an teriorpseudocardiual 

 with a deep, triangular pit back of it, and often a small, low, com- 

 pressed tooth behind the pit; laterals granularly striate, beak cavities 

 rather deep; anterior muscle scars deep, rough at the bottom; poste- 

 rior scars large, long and oblique; nacre silvery, sometimes radially 

 striate at the edge; palleal line indented into a sinus at its posterior 

 end, above which is a granular, striate callus. 

 Animal unknown. 



tCUNEOPSIS CAPITATUS Heude. 



* I'nio capitatua HEUDE, Jl. tie Couch., XXII, 1874, p. 114 ; v Conch. Fluv. Nank.,1, 



1875, pi. ii, fig. 5.* P.ETEL, Conch. Sam., Ill, 1890, p. 147. 



China. 



tCUNEOPSIS HEUDEI Heude. 



*Unio Iteudei HEUDE (Bazin manuscript), Jl. de Conch., XXII, 1874, p. 114. 

 * P^TEL, Conch. Sam., Ill, 1890, p. 155. 



* Unio corderii HEUDE, Conch. Fluv. Nank., 1, 1875, pi. i, fig. 3. 1 * P.ETKL, Conch., 



Sam., Ill, 1890, p. 149. 



China. 



tCUNEOPSIS CELTIFORMIS Heude. 



* Unio celtiformis HEUDE, Jl. de Conch., XXII, 1874, p. 113; Conch. Flnv. Nank., I, 



1875, pi. i, fig. 4.* P.ETEL, Conch. Sam., Ill, 1890, p. 147. 



China. 



tCUNEOPSIS PISCICULUS Heude. 



* Unio pisciculus HEUDE, Jl. de Conch., XXII, 1874, p. 115; *Conch. Fluv. Nank.. I, 



1875, pi. n, figs. 6, 6a. * P.ETEL, Conch. Sam., Ill, 1890, p. 163. 



* Unio retortus vox MARTENS, Sitzber. Ges. Nat. Fr., 1875, p. 4; *Mal. Blatt., XXII, 



1875, p. 188; Nov. Conch., IV, 1876, p. 158, pi. cxxxvi, figs. 3, 4. 2 *P.ETEL, 

 Conch. Sam., Ill, 1890, p. 165. 



China. 



tCUNEOPSIS RUFESCENS Heude. 



* Unio rufescens HEUDE, Jl. de Conch., XXII, 1874, p. 113; Conch. Fluv. Nank., 1, 



1875, pi. i. fig. 2.* P.ETEL, Conoh. Sam., Ill, 1890, p. 166. 



China. 



1 Changed to corderi by Heude in above reference. 



2 Von Martens places this in the synonymy of U. piscicuhts in Vol. IV of the Nova- 

 tites Conchologia. 



