NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 889 



tDIPLODON DORSUOSUS Gotld. 



* Unto dorsuosiis Gould, Pr. Bost. Soc. N. H., Ill, 1850, p. 296; * U. S. Expl. Exp., 



XII, 1852, p. 430, figs. 540, 540a, 540&; * Otia Conch., 1862, p. 89.—* H. and A. 



ADAMs.Gen. Eec. Moll., II, 1857, p. 497.— ""PJETELjConch. Sam., Ill, 1890, p. 151. 

 * Margaron ( Unio) dorsitosus Lea, Syu., 1852, i>. 21. 

 "Unio napeanensis Coxrad, Pr. Ac. N. Scl. Phila., V, 1852, p. 10; "Jl. Ac. N. Sci. 



Phila., 1854, p. 296, pi. xxvi, fig. 4.— *H. and A. Adams, Gen. Leo. Moll., II, 



1857, p. 498. — *Rkeve, Conch. Icon., XVI, 1865, pi. xxiii, fig. 2.— * P.-etel, 



Conch. Sam, III, 1890, p. 160. 

 *Marqaron ( Unio) napeanensis Lea, Syn., 1852, p. 20; 1870, p, 30. 



Nepean River, Australia. 



DIPLODON GLENELGENSIS Dennant. 



* Unio glenelgensis Dennant, Pr. Roy. Soc. Vict., X, 1898, p. 112, pi. iv. 

 Glenelg River, Victoria. 



(Group of Diplodon menziezi.) 



Shell subrhomboid; beak sculpture not strong, consisting- of broken, 

 nodulous ridges curving toward each other below, with generally a 

 smooth space between, not extending over the shell. 



Animal as in the subgenus. 



tDIPLODON MENZIEZI Gray. 



* Unio menziezi Gray, In Dieffenhach's N. Z., II, 1843, p. 257. — * ?Musgrave, Phot. 



Conch., 1863, pi. ii, fig. 1.— *Hutton, N. Z. Moll., 1880, p. 160.— * P.etel, 

 Conch. Sam., 1890, p. 159. 



* Unio niensiezianus Reeve, Conch. Icon., XVI, 1865, pi. xxix, fig. 152. 



* Margaron ( Unio) menzieni Lea, Syn., 1870, p. 46. 



* Unio auoldandica Gray, In Dieffenbach'a N. Z., II, 1843, p. 257. — " Hutton, N. Z. 



Moll., 1880, p. 161. 

 ""fUnio aucklandicus Sowerby, Conch. Icon., XVI, 1866, pi. xxx, fig. 156. — 



*P^TEL, Conch. Sam., Ill, 1890, p. 145. 

 *^ Margaron ( Unio) aucklandicus Lea, Syn. ,1870, p. 45. 



tDIPLODON MENZIEZI var. RUGATUS Hutton.i 



* Unio ruf/atns Hutton, Tr. N. Z. Inst., XVI, 1884, p. 216. — *PyETEL, Conch. Sam., 



Ill, 1890, p. 166. 



tDIPLODON MENZIEZI var. HOCHSTELLERI Krauss. 



^ Unio hochstelleri Dunker, Mai. Bl., VIII, 1862, p. 153. — *Sowerby, Conch. Icon., 

 XVI, 1868, pl.LXXXvi, fig.463.—*HuTTON, N.Z.Moll., 1880, p. 161.— *P^tel, 

 Conch. Sam., Ill, 1890, p. 155.2 



' The name rwgra^Hs was applied previously to a European Unio by Rossmassler; 

 but it may be used as a varietal name. This seems to be a small form of menziezi 

 which sometimes merges into hochstelleri. 



^Suter believes this to be only a pathologic form of menziezi. Ho says in a letter 

 to the author that he has seen the same kind of disease among small rngatus. 



