NO. ] 205. S YXOPSIS F THE XA I A DES— SIMPSON. 801 



ridges on the posterior slope; beaks rather low, the sculi^ture coarse, 

 irregular, broken bars, somewhat doubly looped and swollen on the 

 posterior ridge, with strong, radiating ridges behind them; pseudocar- 

 diiials solid, often compressed in the direction of the axis of the shell; 

 laterals granular ; beak cavities moderately deep ; one or more granular 

 calluses behind the laterals; nacre white or lurid, slightly radially 

 granular outside the pallial line. 

 Animal unknown. 



tQAUDRULA LEAI Gray. 



* Unio leai Gray, Griff. Cuvier, XII, 1834, p. 600 (index), j)l. xxi, fig. 1. ' — * Catlow 



and Ueeve, Conch. Norn., 1845, p. 60. — *" Benson, Jl. As. Soc. Calcutta, XXIY, 

 1855, p. 136 (p. 18, reprint).— *H. and A. Adams, Gen. Eec. Moll., II, 1857, p. 

 496.—* KusTEK, Conch. Cab. Unio, 1861, p. 232, pi. lxxviii, fig. 3.—* ? Heude, 

 Conch. Fluv. Nank., 1, 1875, pi. iv, fig. 10, pi. vi. — * Gredlek, Jahrb. Deutsch, 

 Mai. Ges., VIII, 1881, p. 122.— ^ von Martens, Sitzber. Xat. Fr., 1885, p. 77.— 

 . * P.ETEL, Conch. Sam., Ill, 1890, p. 157. 



* Margarita ( Unio) leaii Lea, Syn., 1836, p. 17; 1838, p. 16. 



* Margaron ( TJnio) leaii Lea, Sjm., 1852, p. 23; 1870, p. 34. 

 *Uvio Iceai Hanley, Biv. Shells, 1843, p. 182, pi. xxiii, fig. 55. 



* Unio vodulosus Reeve, Conch. Icon., XVI, 1864, pi. ix, fig. 32. 



t QUADRULA LEAI var. LELECI Heude. 



* Unio leleci Heude, Conch. Fluv. Xank, I, 1875, pi. iv, fig. 12; \', fig. 14. — Gred- 



Xer, Jahrb. Deutsch, Mai. Ges., VIII, 1881, p. 122. 



* Unio ricMliofeni von Martens, S. B. Nat. Fr. 1875, p. 3 ; Mai. Blatt, XII, 1875, p. 



187; Nov. Conch., IV, 1876, p. 156, pi. cxxxvi, figs. 1-3.— ^'P.etel, Conch. 

 Sam., Ill, 1890, p. 165. 



* Unio Jeai var. leleci P^-etel, Couch. Sam., Ill, 1890, p. 157. 



Cbiua; Tonkin; Mekong lliver. 



QUADRULA OVATA Simpson. 



Unio vestitus var. a Heude, Conch. Fluv. Nank., VIII, 1883, pi. lviii, fig. 112 ; lix, 

 fig. 116.3 



QUADRULA CAVEATA Heude. ^ 



*■ Unio careatus Heude, Conch. Fluv. Nauk., Ill, 1877, pi. xxiv, fig. 53. — * P.etel, 

 Conch. Sam., Ill, 1890, p. 147. 



* Unio contritus Heude, Conch. Fluv. Nank., VII, 1881, jjl. lvi, fig. 103. — ' Pj^tel, 



Conch. Sam., Ill, 1890, p. 148. 



* Unio quadrangulosus Heude, Couch. Fluv. Nank., VII, 1881, pi. lvi, fig. 104. — 



*PiETEL, Couch. Fluv. Nank., Ill, 1890, p. 164. 



China. 



' A very brief description is given in the index. 



- Vou Martens, in a note at the close of Vol. IV, places his species in the synonymy 

 of U. leleci Heude. 1 am satisfied that leleci is but a A'ariety of U. leai Gray. 

 •' Heude's name is preoccupied by Lea for a Unio, I therefore change it as above. 

 Proc. IsT. M. vol. xxii^ 51 



