PLATE IV K. 

 PATEKULA, B.vuKANDE. 



Page 78. 



rATEUUI-A (?), sp. 



Fiff. 1. The intei'ior cif a pediole-valve, taken from a natural cast of the internal surface. The liroail 

 marginal lioriler, narrow ti.ssure ami radiate muscular markinirs, indicate the clo.se agreement 

 of this fossil with Paterfi-a. X S. 



Quet)ei- group. South M. John's Market, Quebec. 



MONOBOLINA, Salter. 



P;i;;o S.'i. 



MoNOBOLiXA PLUMBEA, Salter. 



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



Fig. 3. Interior of a similar valve. X 3. (Davidson, Brit. Sil. Bi-ach., pi. I, figs. 'J3. 24.) 



ORBICULOIDEA, D'Okbigny. 



Page 120. 

 OrBICULOIDEA, .S}). ? 



Fig. 4. The interior of a bi-aohial valve ; showing a faint median apical sejitum and radiating muscular 

 ridges. X 2. 



St. Louis limestone. Crittenden county, Kij. 



LINGULA, Bkuguiere. 



Page 2. 

 LiNGULA LINGUATA, S[). IIOV. 



Fig. T). The jiedicle-valve from which the epi(iei'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, &\). (?). 



Fig. ti. An internal cast to which a fragment of the shell adheres. The sin-fac:e is co\-ered with minute 

 papilUe, which are probably casts of the inner openings of the vertical canals. X 5. 

 Black slate (Genesee horizon). Near Vancehurg, Ky. 



LiNGULA Waverliensis, Hcii-iclv. 



Fig. 7. View from the pedicle-valve, of a specimen retaining the impression of the pedicle. 

 Waverly sandstone. Oil City. Penna. 



LiNGULA T.ENiOLA, sp. IIOV. {==Lingula lamelluta, 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 Ijeak by con- 

 centric growth-lines. X 1.5. 



Clinton group. Clinton, N. Y. 



LiNGULA CUNEATA, ColU-ad. 



Fig. 9. An internal cast of a pedicle-valve ; showing the muscular scars and va-scular sinuses. X 3. 

 Medina sandstone. Medina, N. Y. 



