PLATE X. 
I'issihinulii Ci'arkei, Muore, Bp. 
Fig. 1. CarJiiial or JorBal view of tlio iutcvnal cast, PI. XI, Fig. 1. 
r . — lliglil valve. 
/. — Left valve. 
». !(. — Broken umbones. 
n . — Thickened lower edge of articulus. 
Fig. 2. Articulus of llie imperfect right valve, PI. VI, Fig. 3. — x 2. 
a. — Blunt projecting cardinal tooth. 
(('. — Thickened lower edge of articulus. 
b. — Anterior cardinal socket. 
c. — Posterior cardinal socket. 
(/. — Shallow posterior end of r. 
€.- Sharp oblique thickening of hinge plate above d. 
/. — Xyinph, widening in a posterior direction. 
(j . — Posterior boundary groove of lunule, passing to the cardinal tooth a 
h . — Ligament groove passing under the prosogyrate umbo. 
k. — Median impressed groove of ligament area m. 
l. — Anterior impressed groove of ligament area m. 
m . — Area occupied by expanded ligament. 
Isocardia lunulata, Nyst. 
Fig. 3. Articulus of the right valve. — x 2. 
a’.— Superior cardinal tooth 
a^-‘. —Inferior cardinal tooth. 
Id . — Socket for the reception of the cardinal tooth of the left valve, 
/L— Nymph 
!/* — Accessory ligament groove. 
A®.— Ligament groove. 
o’. — Anterior groove of lunule, 
j)’.— Posterior groove of lunule, 
Miocene of Ecegltem. 
Pseudavicula anomala, Moore, ap, 
Fig. 4. Imperfect right valve, with a portion of the teat remaining. 
Mount Stuart Bun — Colin. Macleay Museum. 
