798 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XXH. 



anterior cicatrices small, deep, posterior shallow ; cavity of the beaks 

 enormously deep, compressed; dorsal cicatrices on the under side of the 

 shelf. 



Animal unknown. 



tQUADRULA TORTUOSA Lea. 



* Unio torluosns LEA, Pr. Ac. N. Sci. Plrila., IX, 1865, p. 76; *J1. Ac. N. Sci. Phila., 



VI, 1868, p. 286, pi. xxxix, fig. 98; * Obs., XII, 1869, p. 46, pi. xxxix, fig. 98. 



* Margaron ( Unio) tortuosus LEA, Syn., 1870, p. 30. 



t * I'nio (Lampsilis) snltortus BAIRD auil ADAMS, Proc. Zool. Soc. Lond., 1867, p. 491, 

 pi. xxvi, figs. 1, la. 



* Unio subtortus SOWERBY, Conch. Icon., XVI, 1868, pi. LXXXVII, fig. 465. 



* HEUDE, Conch. Finv. Nank., VIII, 1883, pi. LXI, fig. 119.* P.HTEL, Conch. 

 Sam., Ill, 1890, p. 169. 



* Unio retortus HEUDE, Conch. Fluv. Nank., VIII, 1883, pi. LVII, fig. 109. *P.KTHL, 



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



China. 



tQUADRULA TIENTSINENSIS Crosse and Debeaux. 



* Unio tientsincnsis CROSSE and DKBEAUX, .11. de Conch., Ill, 1863, p. 257, pi. x, fig. 



1.* SowKRBY,Conch. Icon., XVI, 1868, pi. xci, fig. 514, 514o, 514ft.* P.*:TEL, 

 Conch. Sam., Ill, 1890, p. 169. 



* Margaron ( Unio) tientsinensis LEA, Syn., 1870, p. 30. 



China. 



QUADRULA ZONATA Heude. 



* Uniozonatus HEUDE, Conch. Fluv. Nank., VIII, 1883, pi. LXI. *P^ETEL, Conch. 



Sam., Ill, 1890, p. 172. 



* Unio tientsinensis HEUDE, Conch. Fluv. Nank., VIII, 1883, pi. LX, fig. 118. 



China. 



tQUADRULA FIBROSA Heude. 



* Uniofibrosus HEUDE, Conch. Fluv. Nank., II, 1877, pi. XL, fig. 22.' 



Conch. Sam., Ill, 1890, p. 152. 



*t Unio spurius HEUDE, Conch. Fluv. Nank., II, 1877, pi. xi, fig. 22. " 

 Conch. Sam., Ill, 1890, p. 168. 



China. 



tQUADRULA NODULOSA Wood. 



* Mya nodulosaWoov (part), Gen. Conch., I, 1815, p. 106, pi. xxn, figs. 1,2. 2 



* DILLWYN, Catalogue I, 1817, p. 52.* WOOD, Index Test, 1825, p. 12, pi. 

 n, fig. 29ft ; * Index Test. Rev., 1856, p. 16, pi. n fig. 29. 



* Unio nodulosus HANLEY, Test. Moll., 1842, p. 180. *Biv. Shells, 1843, p. 180. 



*CATLOW and EEEVE, Couch. Nom., 1845, p. 61. *H. and A. ADAMS, Gen. 



1 Doubtfully distinct from zonata. 



2 Wood gives four figures ; the first and second being a solid, nodulous, Chinese 

 species ; the third and fourth seem to be Unio pictorum. Lamarck used the name 

 nodulosa for a Unio (An. sans Vert.j VI, 1819, p. 78), and refers to the Encyclopedic 

 M6thodique, 1797, pi. 248, fig. 19, and this figure is no doubt that of Unio pictorum. 

 Wood seems to have confounded the two. 



