102 
A. TetraGona. Lam.—Turt. B. p. 167, t. 13. f. 1. 
—F. p. 398.—Obliquely quadrangular, whitish brown, 
with granular decussations, tumid at the beaks from 
which proceed a nearly central rib to the angular point 
of the opposite margin; hinge not quite straight in con- 
sequence of the marginal slope, ventral edge gaping ; 
inside white with a purplish blotch at one end. %...1. 
W. Ireland. 
A. BarBata. Brown in Wern. Soc. 2. p.512. t. 24. 
f.3.—F. p. 398.—ReticutatTa. Turt. B. p. 168.— 
Oblong, rather compressed, rounded at one end and 
slightly angular at the other, white under an olive 
brown skin, with numerous nearly equidistant flat ra- 
diating ridges, covered with a fine brown downy pile 
and decussated by minute striz; ventral edge straight 
and nearly closed; beaks nearer one end and rather 
approximated; inside glossy with pale rays. $...1,014. 
Lough Strangford. 
** Margin entire. 
A. LactEa. Lan. 1141.—D. p. 236.—Lam. 17.—List. 
t. 235. f. 69.—Pen, 4. p. 216. ¢. 61. f. 2.— Da Cost. 
p. 171. t. 11. f. 5.—Mont. p. 1388.—Don. 4. t. 135. 
—Lin. T. 8. p. 92.—Dor. Cat. p. 36. t. 11. f. d.— 
