566 - UNIO 
pseudocardinals compressed; laterals slightly curved; nacre 
bluish-white tinted with salmon, iridescent behind. 
Length 57, height 27, diam. 17 mm. 
Asia Minor. 
Unio bythinicus Koper, Icon., new ser., VI, 1893, p. 96, pl 
CLXXIX, fig. 1128.—Simpson, Syn., 1900, p. 695. 
This may group with U. pictorum. It is an elongated rhom- 
boid, compressed and unicolored species with no very striking 
characters. 
UNIO MICELII Kobelt. 
Shell oblong, subinflated, solid, inequilateral, with very high, 
rounded and rather full beaks, their sculpture not observed ; 
posterior ridge well developed, rounded, extending towards 
the posterior base where the shell is widely rounded, above 
this it is obliquely truncated behind; dorsal line meeting this 
truncation with an angle; base line lightly incurved; surface 
strongly concentrically sulcate; epidermis brownish or black- 
ish-olivaceous ; pseudocardinals heavy ; laterals low but solid; 
anterior muscle scars large and deep; posterior scars super- 
ficial; pallial lines strongly crenate; nacre rose-tinted. 
Length 92, height 45, diam. 32 mm. 
Tunis. 
Unio micelu Konevt, Nach. Mal. Ges., XVI, 1884, p. 182; 
Icon:, new ser., II, 1886, p. 24, pl. x1im, figs. 260, 261.— 
SIMPSON, Syn., 1900, p. 695. 
This seems to be a very distinct species, being quite ponder- 
ous and having high, widely rounded beaks. The surface is 
rudely, concentrically sculptured and is a dark brown or black- 
ish-olivaceous color without rays. 
UNIO EMARGINATUS Lea. 
Shell oblong, slightly arcuate, subrhomboid, subsolid, inequi- 
lateral, subcompressed ; beaks slightly elevated above the dor- 
sal outline, scarcely inflated, their sculpture apparently a num- 
ber of broken corrugations that are inclined to be doubly 
looped; posterior ridge high, rounded above, somewhat dou- 
