PLATE IV k. 
PATERULA, Barrande. 
Page 78. 
Paterula (?), sp. 
Fig. 1. The interior of a pedicie-valve, taken from a natural cast of the internal surface. The broad 
marginal border, narrow fissure and radiate muscular markings, indicate the close agreement 
of this fossil with Paterula. X 5. 
Quebec group. South St. John's Market, Quebec. 
MONOBOLINA, Salter. 
Page 83. 
Monobolina plumbea, Salter. 
Fig. 2. Exterior of a brachial (?) valve. X 3. 
Fig. 3. Interior of a similar valve. X 3. (Davidson, Brit. Sil. Brach., pi. 1, figs. 23, 24.) 
ORBICULO IDE A, D’Orbigny. 
Page 120. 
Orbiculoidea, sp. ? 
Fig. 4. The interior of a brachial valve; showing a faint median apical septum and radiating muscular 
ridges. X 2. 
St. Louis limestone. Crittenden county, Ky. 
LINGULA, Bruuuiisre. 
Page 2. 
Lingula linguata, sp. nov. 
Fig. 5. The pedicle-valve from which the epidermal layer is partially exfoliated ; showing the peculiar 
deflection of the anterior margin, which is a constant feature. X 2. 
Clinton group. Near Hamilton, Ontario. 
Lingula, sp. (?). 
Fig. 6. An internal cast to which a fragment of the shell adheres. The surface is covered with minute 
papillae, which are probably casts of the inner openings of the vertical canals. X 5. 
Black slate (Genesee horizon). Near Vanceburg, Ky. 
Lingula Waverliensis, Herrick. 
Fig. 7. View from the pedicle-valve, of a specimen retaining the impression of the pedicle, 
Waverly sandstone. Oil City, Penna. 
Lingula -weniola, sp. nov. ( ==Ling.ula lamellata, Hall, Pal. N. Y., vol. ii, p. 55, pi. xx, 
figs. 4 a, b, c. 1847). 
Fig. 8. The pedicle-valve ; showing the peculiar surface ornamentation, crossed near the beak by con¬ 
centric growth-lines. X 1.5. 
Clinton group. Clinton, N. Y. 
Lingula cuneata, Conrad. 
Fig. 9. An internal cast of a pedicle-valve ; showing the muscular scars and vascular sinuses. X 3. 
Medina sandstone. Medina, N. Y. 
