PLATE IV K. 

 PATERULA, Barrande. 



Page 78. 



Paterui.a (?), sp. 



Fig. 1. The interior of a peciicle-valve, taken from a natural cast of the intei-nal surface. The broad 

 marginal border, nari'ow fissure and radiate muscular markings, indicate the close agreement 

 of this fossil with Paterdla. X 5. 



Quebec group. South St. John's Market, Quebec. 



MONOBOLINA, Salter. 



Page S3. 



MoNOBOLiNA PLUMBBA, Salter. 



Fig. 2. Exterior of a brachial (?) valve. X 3. 



Fig. 3. Interior of a similar valve. X 3. (Davidson, Brit. Sil. Brach., pi. I, figs. 23, 24.) 



ORBICULOIDEA, D'Orbigny. 



Page 120. 



Orbtculoidea, sp. ? 



Fig. 4. The intei-ior of a brachial valve ; showing a faint median apical septum and I'adiating muscular 

 ridges. X 2. 

 , St. Louis limestone. Crittenden county, Ky. 



LINGULA, Bruuuiere. 



Page 2. 



Lingula linguata, .sp. nov. 



Fig. 5. The pedicle-valve from which the epidei'mal 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 siu-face is covered with minute 

 papillfe, which are pi'obably casts of the inner openings of the vertical canals. X 5. 

 Black slate (Genesee hoi-izon). Near Vancehurg, 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 TiENiOLA, .sp. nov. {==Lingula 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, CoiiraJ. 



Fig. 9. An internal cast of a jiedicle-valve ; showing the muscular scars and vascular sinuses. X 3. 

 Medina sandstone. Medina, N. T. 



