UNIO 547 
Unio kisonis Kopenr, Icon., tst sup., 1895, p. 17, pl. vu, figs. 
eet 
Unio ciconius Koeeir, Icon., new ed., XIX, 1912, p. 11, pl. 
DXVU, fig. 2697. 
Unio medicus Koper, Icon., new ed., XIX, 1912, p. 17, pl. 
Dee ee, 2707: 
A fine species, which is remarkably inequilateral and in 
adult specimens is decidedly truncate in front, hence Swain- 
son’s name. It is more or less wedge-shaped whether viewed 
from above or from the side; it has a wide, well-marked lun- 
ule and very deep anterior scars. 
As the name Unio truncatus, which was first applied to this 
species by Swainson had been previously used by Spengler 
for another Unio in 1793, it was necessary to discard this and 
I have applied Bourguignat’s name, which was next applied 
to it. Lea's Unio dignatus agrees with Swainson’s figure. 
Unto pietri Locard. 
Shell somewhat wedge-shaped, inequilateral, convex or sub- 
inflated, solid; beaks full and high, placed at some little dis- 
tance from the anterior end, their sculpture consisting of fine, 
irregular corrugations with two rows of nodules. Anterior 
end rounded but angled above; dorsal line nearly straight for 
some distance behind the beaks, joining the oblique post-dorsal 
truncation at an angle; posterior ridge full, rounded or slight- 
ly biangulate, ending behind below the median line in a point 
or a feeble biangulation; pseudocardinals subcompressed ; lat- 
erals delicate and slightly curved; nacre white or pale rose. 
The shell is nearly smooth or somewhat concentrically sul- 
cated, and yellowish or yellow-green. 
Length 50-77, height 28-31, diam. 20-22 mm. 
Length 48, height 24, diam. 19 mm. 
Asia Minor. 
Unio pietri Locarp, Comptes Rendus, XCI, 1880, p. 500; Arch. 
Mus. Lyon, III, 1883, p. 210, pl. xx, figs. 17-19.—SIMPSON, 
Syn., 1900, p. 688. 
Unio petrot Pater, Conch. Sam., III, 1890, p. 163. 
