NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 799 



Rec. Moll., II, 1857, p. 496.—* Sowerby, Couch. Icon., XVI, 1868, pi. Lxxxiii, 

 fig. 439.—* P.ETEL, CoDcli. Sam., Ill, 1890, p. 161. 



* Margarita ( TJnio) nodulosits Lea, Syn., 1836, p. 16; 1838, p. 15. 



* Margaron {Prisodon) nodulosits Lea, Syn., 1852, p. 27; 1870, p. 27. 



* Castalia nodulosa H. and A. Adams, Gen. Rec. 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.^ 



* 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 iwlysticto-scrijyfus K^UDE, Conch. Fluv. Nank., II, 1877, pi. xiii, fig. 26.— 

 *P^TEL, Conch. Sam., Ill, 1890, p. 164. 



'^ Unio scripto-polystictus Heude, ^ Conch. Fluv. Nank., II, 1877, pi. xiii, fig. 27. 

 *Unio scri2)to-2}olystrictus P^etel, Couch. Sam., Ill, 1890, p. 167. 



China. 



t QUADRULA POLYSTICTUS Heude. 



""Unio ■pohjstictns Heude, Conch. Fluv. Nank., II, 1877, pi. xii, fig. 25. — *PyETEL, 

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



China. 



t QUADRULA SIMILARIS Simpson. 



"Unio affinis Heude, Conch. Fluv. Nank., I, 1875, pi. in, figs. 7,7a.-* — *P^tel, 

 Conch. Sam., IIL 1890, p. 144. 



China. 



t QUADRULA MICROSTICTIS Heude. 



* Unio microstictis., Heude, Conch. Fluv. Nank., II, 1877, pi. xii, fig. 24; *Jahrb. 



Deutsch, Mai. Ges.,VIII, 1881, p. 122.— * Pjetel, Conch. Sam., Ill, 1890, p. 159. 



China. 



(G-roup of Quadrula roehechouarti.) 



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 



' 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 states 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, 



^Believed by Heude to be a hybrid 'with. j)olysticto-scriptus. I can not see that the 

 two differ sufficiently to be separated. 



■•The name affinis was iised long before by Dr. Lea for a Unio. 



