NOTES ON A COLLECTION OF TERTIARY LIMESTONES. 
EXPLANATION OF PLATES. 
Plate VI. 
Fig. 1. — Globigerina cf. bvttoides, d’Orbigny. A median section of 
the test, x 52. 
Fig. 2. — Truncatulina ungeriana, d’Orbigny, sp. (stout var.) : 
(a) Superior aspect ; (b) inferior aspect ; (c) peripheral 
aspect, x 52. 
Fig. 3. — Mopsea hamiltoni, Thomson : (a) Lateral aspect ; ( b ) 
articular surface, x 3. 
Fig. 4.— Mopsea hamiltoni, Thomson. Lateral aspect of another 
example, x 3. 
Fig. 5. — Heteropora pisiformis, MacGillivray. x 10. 
Fig. 6. — Heteropora pisiformis, MacGillivray. Vertical section of a 
pyriform zoarium. x 26. 
Fig. 7 .—Selenaria concinna, T. Woods. A thin section in limestone, 
taken tangentially to the zooecial surface ; showing 
vibracular and zooecial cells, x 52. 
Fig. 8. — Pinna reticosa, sp. nov. x 2. 
Fig. 9. — Lima bassi, T. Woods. A portion of the shell surface ; 
from a wax squeeze of a mould in limestone, x 3. 
Fig. 10. — Placunanomia sella, Tate. Nat. size. 
Note.' — Figures 2-6, 8, and 10 are from the polyzoal limestone of 
the Seal River ; the remainder are from the hard limestone of the 
same locality. 
Plate VII. 
Fig. 1.— Pecten praecursor, Chapm. From the polyzoal rock. Nat. 
size. 
Fig. 2.—P. praecursor, Ch. Another specimen showing tegulate 
ornament on the marginal part of the valve. Polyzoal 
rock. Nat. size. 
Fig. 3. — Selenaria m,arginata , T. Woods. A tangential section 
including apical region. From the pink limestone. 
x 14. 
Fig. 4. — Palaeachlya tuberosa, Chapm. The organism perforating a 
worn shell-fragment. From the pink limestone, x 164. 
Fig. 5. — Thin section of the polyzoal rock, showing a cidaroid spine, 
numerous polyzoa, and the granular calcitic groundmass. 
x 14. 
Fi g 6 —Thin section of the pink limestone, showing polyzoa, shell- 
fragments, and foraminifera ffl = Truncatulina vana- 
bilis), embedded in a fine pasty calcitic groundmass. 
x 14. 
