343 



Lma. 



Lingula clintoni. See Lingula oblong a, — V a. 

 Lingula concentrica, Vanuxen, page 168, figs. 42, 4. Hall, 

 VffI e jim^^ pag^ 223, fig. 94? 4, Genesee formation, 



(Kogers, finds in the Genesee two species 

 of Lingula, with Ooniatites interruptus ; 

 ^^^ Geol. Pa., 829.— Conrad, 1839).— Vllle, 



H^\ 



Lingula crassa, Hall. Pal. N. Y. Vol. 1, 1847, Trenton. 

 dc^Asa, .^. A'— Emmons, Amer. GeoL Vol. 1, pt. 2, 1855, 

 I'P'-^' p. 203, plate 8, figs. 8 a, 5, c, d; Shell 

 4 thick, etc.; but the marked difference of 

 .%»At'- - M -^^ '- ^- breadth of the upper and lower scales is a 

 rather common feature of many other species. Trenton lime- 

 stone formation, to which it is confined. — II c. 



Lingula cuneata, Conrad. Hall, page 48, figs. 6, 5; page 52, 



IV 



fig. 30. (Rogers, Geol. Pa., 1858, Yol. 2, page 822, no figure. 

 Conrad, page 64) showing specimens with tails of sand formed 

 by the current. — Medina^ IV. 



Lingula curta. Rogers, 1858, pages 818, 820, 821, fig. 604. 



J.- Trenton formation. (Conrad, Journal Acad. Nat. 



"'IP^^I^ Sci., Philadelphia, 1842). Occasionally found in 



R^^^ft some of the Trenton beds of the Nittany valley. 



6Q4rW^ (C. E. Hall and Ewing, T4. p. 424.)— //c. 



