NO. 1205. SYNOPSIS OF THE X.IIADES SIMPSON. 799 



Rec. Moll., II, 1857, p. 496.* SOWERBY, Conch. Icon., XVI, 1868, pi. LXXXIII, 

 fig. 439.* P^ETEL, Conch. Sam., Ill, 1890, p. 161. 

 'Margarita ( Unio) twdulosus LEA, Syn., 1836, p. 16; 1838, p. 15. 



* Margaron (Prisodon) nodulosus LEA, Syii., 1852, p. 27; 1870, p. 27. 



* Castalia nodulosa H. and A. ADAMS, Gen. Eec. Moll., II, 1857, p. 509. 



t Unio grandidens LEA,' Pr. Ac. N. Sci. Phila., V, 1862, p. 168 ; * Jl. Ac. N. Sci. Phila., 

 V, 1862, p. 205, pi. xxx, fig. 274; *Obs., IX, 1863, p. 27, pi. xxx, fig. 274. 



* Margaron ( Unio) grandidens LEA, Syn., 1870, p. 34. 



China. 



QUADRULA KOUANGENSIS Simpson. 2 



* Unio moreletianus HEUDE, Conch. Fluv. Nank., VIII, 1883, pi. LX, fig. 117. * ~PJE- 



TEL, Conch. Sam., Ill, 1890, p. 160. 



Kouaug-te tclieou, China. 



t QUADRULA POLYSTICTO-SCRIPTUS Heude. 



* Unio polysticto-scriptm HEUDE, Conch. Fluv. Nank., II, 1877, pi. xm, fig. 26. 

 P^ETEL, Conch. Sam., Ill, 1890, p. 164. 



* Unio scripto-polystlctus IlEri>E, 3 Conch. Fluv. Naiik., II, 1877, pi. xm, fig. 27. 

 *Unio scripto-polystrictuii P.fcTEL, Conch. Sani., Ill, 1890, p. 167. 



China. 



t QUADRULA POLYSTICTUS Heude. 



*Unio polystictus HEUDE, Conch. Fluv. Nauk., 11,1877, pi. xn, fig. 25. *P.ETKL, 

 Conch. Sam., Ill, 1890, p. 164. 



China. 



t QUADRULA SIMILARIS Simpson. 



*Unio affinis HEUDE, Conch. Fluv. Nank., I, 1875, pi. in, figs. 7,7a. 4 *P^ETEL, 

 Conch. Sam., Ill, 1890, p. 144. 



China. 



t QUADRULA MICROSTICTIS Heude. 



* Unio microsliclis, HEUDE, Couch. Fluv. Nank., II, 1877, pi. xn, fig. 24; *Jahrb. 



Dcutsch, Mai. Ge8.,VIII, 1881, p. 122. * PJETEL, Conch. Sam., Ill, 1890, p. 159. 



China. 



(Group of Quadrula rochechouarti.) 



Shell rhomboid, with a strong posterior ridge, rounded before, 

 incurved below, and somewhat biangulate on the posterior base, with 

 very strong folds on posterior slope which begin on the posterior ridge as 



1 A single valve (the type) is in the Lea collection, and an opposing matched valve 

 is in that of the U. S. National Museum. Dr. Lea sfca tes that they were obtained near 

 Hot Springs, Arkansas, by Major Byrd Powell. I am certain this is a mistake, and 

 that it is a Chinese species. It agrees exactly with Wood's figure of nodulosa, is 

 slightly pushed over or twisted on its axis, and has the vertically ridged laterals 

 characteristic of the heavy Chinese forms very strongly developed. 



2 Heude's name moreletianus has been twice preoccupied. 



3 Believed by Heude to be a hybrid with polyaticto-scriptus. I can not see that the 

 two differ sufficiently to b.e separated. 



4 The name affinis was used long before by Dr. Lea for a Unio. 



