UNIO.— Plate XXV. 



Hub. Europe. Siberia. North Africa. 



Of a clinracteristic fulvous-olive colour ami elongated 

 form, very generally distrilnited tluougliout Europe, Si- 

 l)eria, and North Africa. 



Species 124. (Mus. Cuming.) 

 Unio tumidus. Tin. testa ovato-cuneiformi, gibbuso-tu- 



midd, latere aiitico rotimdato, postico decUve obtuse 



angulnto, deinde acuminata, umbonibus plicato-corm- 



gatis ; olivaced, viridi palUde radiatd. 

 The swollen Unio. Shell ovately wedge-shaped, gib- 



bously swollen, anterior side rounded, posterior slo- 



pingly obtusely angled, then acuminated, umboes 



plicately wrinkled ; olive, faintly rayed with green. 

 Philippson, Nov. Test. Gen. p. 17. 



Unio ovalis, Philippson. 



Mya ovalis, Pulteney. 



Mya depressa, Donovan. 



Mya ovata, Donovan. 



Unio rostratm, Studer. 



Mysca ovata, Turton. 



Mysea solida, Turton. 



Unio infntKS, Hecart. 



Unio Michatidianus, Desnioidins. 



Unio arciiatus, Bouchard-Chantereiix. 

 Hub. Northern and Central Euro])e. 



Distinguislied from the preceding species by its broach'r 

 and more swollen form, by the umboes being plicately 

 wrinkled, and by its rayed painting. Its geographical 

 distribution is moreover different, being confined to North- 

 ern and Central Europe. 



Species 125. (!\Ius. Cuuiiug.) 

 Unio verecundis. Uh. testa ovata, teniiicitld, latere 



antico rotundalo, postico oblique turnido, superne sub- 



alato ; fulm-aruginosd, viridi fasciatd. 

 The modest Unio. Shell ovate, rather tliin, anterior 



side rounded, posterior obliquely swollen, slightly 



winged at the upper part; fulvous-bronze, banded 



with green. 

 Gould, Pro. Nat. Hist. Soe. Boston, U.S. vol. iii. p. 292. 

 Hub. Manila, Island of Luzon, Philippines. 



Of a simple .'/HO(/o«-like form and peculiar bronze hue 

 of colour. 



