PLATE I\- K. 



PA'I'KRULA, Baukandk. 



PaRC 78. 



Patekii.a (?), .sp. 



Fii.'. 1. Th(> interior (if a iiedicli'-valvi', taken from a iiatiu-al cant nf the inlci-iial siii-faiM'. Tin- liniail 

 marg-inal lionlHr, narrcuv tissurc unil railiate mus<',nlar inai-kiiif;s, in<licato the close agreement 

 of this fossil with Paterula. X 5. 



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



M( )NOBOLI N A , Saltei:. 



Page S:!. 

 MONOliOLINA PLUMBEA, Saltcl-. 



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



Fig. 3. Interior of a similar valve. X 3. (Davidson, Brit. Sil. Brach., pi. 1, fiys. 23, 24.) 



( )RRr('ULOIl)EA. D'OKmoNY. 



Page 12IJ. 

 ( )HI'.ICaLOIDEA, sp. ? 



Fig. 4. The interior of a ln-acliial valve ; showing a faint median ajiical septmn and radiating muscular 

 ridges. X 2. 



St. Loui.-< limestone. Crittenden i-ouiity, Ky. 



LINGULA, IjKuuuiiiKE. 



Pasre 2. 

 LiNtJULA LINGUATA, sp. IIOV. 



Fig. 5. The jiedicle-valve fniui whicli the epidei-mal layer is partially exfoliated ; .showing Ihc peculiar 

 detiection of the anterior margin, whic'h is a constant featui'e. X 2. 

 Clinton group. Near Hamiltuii, Ontario. 



LlNGliLA, Sli. (?). 



Fig. 6. All internal cast to which a fragm(mt of the shell adheres. The surface is covered with minute 

 papillip, which are probably casts of the inner openings of the vertical canals. X ii. 

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



LiNGULA Wavekliensis, Hciiick. 



Fig. 7. View from the pe<licle-valve. of a specimen retaining the impressiim of the pedicle. 

 Wavei'ly sandstone. Oil City. Peima. 



LiNGULA T^ENIOLA, sp. iiov. {==Linyula lamcllulu. Hall, Pal. N. Y., vol. ii, p. 55, pi. xx, 



figs. 4 a, b, c. 1S47). 



Fig. 8. The jieilicle-valve ; showing the peculiar surface ornamentation, crossed near the beak by (ion- 

 centric growth-lines. X I."). 



Clinton group. Clinton. N. Y. 



LiNGULA CUNEATA, ColU-ilt-I. 



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

 Medina saniistone. Medina, N. Y. 



