UNIO 545 
Unio hueti Bourcuicnat, Rev. et Mag., VII, 1855, p. 332, pl. 
vill, fig. I-4+—-MARYrENS, Vorderas. Conch., 1874, p. 35, pl. 
vu, fig. 54.—SIMPSON, Syn., 1900, p. 687.—KoseE.t, Icon., 
new ed., XVIII, 1912, p. 409, pl. piv, fig. 2662. 
While this species is close to several others it does not seem 
to absolutely connect with them. Its almost evenly long ellip- 
tical form and the somewhat delicate but decided concentric 
sculpture separate it from U. turtoni, U. tigridis and U. mus- 
solianus. 
Unio EucirRUs Bourguignat. 
Shell almost regularly elliptical, scarcely subsolid, subcom- 
pressed, somewhat inequilateral; beaks but little raised, not 
inflated, sharp, their sculpture consisting of a double row of 
low nodules; posterior ridge low, somewhat double and end- 
ing behind in a faint biangulation on the median line; surface 
delicately concentrically sculptured, the posterior slope having 
apparently slight radial wrinkles; epidermis yellow; pseudo- 
cardinals almost lamellar; laterals very delicate and straight ; 
nacre white. 
Length 50, height 31, diam. 17 mm. 
Asia Minor. 
Unio eucirrus Bourcutcnat, Mag. Zool., IX, 1857, p. 20, pl. 
vit, figs. 4-6.—Koperr, Icon., VII, 1880, p. 82, pl. cevt, fig. 
2101.—SIMPSON, Syn., 1900, p. 688. 
Margaroen (Unio) eucirrus Lara, Syn., 1870, p. 46. 
This has something the outline of U. mussolianus, but is 
much less inflated and is a thinner, more delicate shell. The 
pseudocardinals seem to be almost lamellar. 
It is probably a form of hueti. 
Unio ricripis Bourguignat. 
Shell somewhat wedge-shaped, being thicker, more inflated 
and higher in front than behind, solid, exceedingly inequilater- 
al; beaks full and quite high, turned forward over a well 
marked lunule, their sculpture varying from a few small pus- 
tules to a number of broken, corrugated ridges, which show 
