798 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



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

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

 shelf. 



Animal unknown. 



tQUADRULA TORTUOSA Lea. 



* Unio tortuosus Lea, Pr. Ac. N. Sci. Pliila., IX, 1865, p. 76 ; * Jl. Ac. N. Sci. Phila., 



VT, 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 * Unio (Lampsilis) suitortus Baird and Adams, Proc. Zool. Soc. Lond., 1867, p. 491, 

 pi. XXVI, figs. 1, la. 



* Unio snhtortus Sowerby, Conch. Icon., XVI, 1868, pi. lxxxvii, fig. 465. — 



*Heude, Conch. Flnv.Nank., VIII, 1883, pi. lxi, fig. 119.— * P.etel, Conch. 

 Sam., Ill, 1890, p. 169. 



* Unio retortus Heude, Conch. Fluv. Nank., VIII, 1883, pi. lvii, fig. 109.— *P.etel, . 



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



China. 



tQUADRULA TIENTSINENSIS Crosse and Debeaux. 



"^ Unio tientsinensis Crosse and Debeaux, Jl. de Conch., Ill, 1863, p. 257, pi. x, fig. 

 1.—* Sowerby, Conch. Icon., XVI, 1868, pi. xci, fig. 514, 514a, 5146.—'' P^tel, 

 Couch. Sam., Ill, 1890, p. 169. 



* Margaron ( Unio) tientsineyisis Lea, Syn., 1870, p. 30. 



China. 



QUADRULA ZONATA Heude. 



* Unio zonatus Heude, Conch. Fluv. Nank., VlII, 1883, pi. lxi. — *P7ETEL, Conch. 



Sam., Ill, 1890, p. 172. 



* Unio tientsinensis Heude, Conch. Fluv. Nank., VIlI, 1883, pi. lx, fig. 118. 



China. 



tQUADRULA FIBROSA Heude. 



* Unio Jibrosus Heude, Couch. Fluv. Nank., II, 1877, pi. xl, fig. 22.' — *P^tel, 



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

 *t Unio spurius Heude, Conch. Fluv. Nauk., II, 1877, pi. xi, fig. 22. — "'P^tel, 

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



China. 



tQUADRULA NODULOSA Wood. 



* Mya nodulosa Wood (part), Gen. Conch., I, 1815, p. 106, pi. xxii, figs. 1,2.2 — 



*DiLLWYN, Catalogue I, 1817, p. 52.— * Wood, Index Test, 1825, p. 12, pi. 

 II, fig. 29Z< ; * Index Test. Eev., 1856, p. 16, pi. ii fig. 29. 



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



*Catlow and Eeeve, Conch. 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., VI, 1819, p. 78), and I'efers to the Encyclopedie 

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

 Wood seems to have confounded the two. 



