UNI 565 
Unio syriacus Lea. 
Shell small, subrhomboid, inflated, subsolid, inequilateral ; 
beaks slightly elevated above the dorsal line, not inflated, their 
sculpture not seen; posterior ridge very full, rounded; dorsal 
line slightly curved; basal line straight; anterior end rounded ; 
posterior end obliquely subtruncated above, rather widely 
rounded below; surface with rather strong growth lines; epi- 
dermis yellowish-ashy, rather smooth; left valve with two 
small, subcompresséd pseudocardinals and two laterals, the 
lower the larger: right valve with two pseudocardinals, the up- 
per very small, and one lateral; nacre pale dirty salmon, rather 
soft and silvery, a little thicker in front; muscle scars small, 
well impressed. 
Length 34, height 22, diam. 17 mm. 
Orontes River, Syria. 
Unio syrtacus Lea, Pr. Acad. Nat. Sci. Phila., VII, 1863, p. 
189; Jl. Acad. Nat. Sci. Phila, VI; 1866,-p. 56, pl. xxx, fig. 
53; Obs., XI, 1867, p. 60, pl. xrx, fig. 53 Simpson, Syn., 
1900, p. 695.—Kosevt, Icon., new ed., XVIII, 1912, p. 44. 
pl. pir, fig. 2655. 
Margaron (Unio) syriacus Lea, Syn., 1870, p. 35. 
A miserable little specimen with the umbonal and post-dor- 
sal regions entirely eroded away, the type, is the only specimen 
I have seen. This is decidedly inflated, the greatest swelling 
being along the line of the very full posterior ridge, and from 
this it is wedge-shaped in front and behind. 
Unio pyTHINicus Kobelt. 
Shell long rhomboid. the dorsal and ventral lines nearly 
parallel, the anterior end rounded, the posterior subtruncate 
above, subcompressed. inequilateral, subsolid; beaks eroded 
badly in the specimen figured but not raised above the dorsal 
line and compressed; posterior ridge rounded and ending in 
a rounded point near the base of the shell; surface concentri- 
cally striate, unicolored, brownish-green ; hinge rather delicate : 
