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Giesslya. J- L- R- Agassiz, Etudes crit. Moll. foss. {3) 1843, 213. 

 Helicina, L. Pfeiffer, Proc. Zool. Soc. London, XVI (187) Ap. 25, 1849, 

 Helix, Le Guillou, Rev. Zool. (Soc. Cuv.) V. May 1842, 139. [120. 



Helminthochiton, J. W. Salter, Q. J. Geol. Soc. London, IIL 1847, 52. 

 Infundibulum, H. C.Lea, P. Amer. Phil. Soc. III. 1843, 164 [«.«.]; Tr. 



Amer. Phil. Soc, n. s., IX (3) Dec. 1846, 249. 

 Inoceramus, J. Parkinson, Tr. Geol. Soc. London, V (i) 1819, 58. 

 Isocardia, J. De C. Sowerby, Min. Conch. V. 1825, 147. 

 Isocardia, A. v. Klipstein, Beitr. geol. ostl. Alpen (2, 3) 1845, ^60. 

 Leptolepis, P. de M. Grey Egerton, Q. J. Geol. Soc. London, V. 1849, 3?- 

 Lingula, T. A. Conrad [3 A. Rep. N. Y. Geol. Surv.], Assembl. no. 275, 



1839, 64- 

 Lingula, J. Hall, N. H. New York (Geol. 4 dist.) 1843, 223. 

 Linia, M. Tuomey, Rep. Geol. Surv. Carolina, 1848, 210 [n. «.]. 

 Lucina, Lamarck, Ann. ^Ius. H. N. (Paris) VII (39) Feb. i8o6, 238. 

 Lutraria, Muenster in G. A. Goldfuss, Petref. German. II (7) 1840, 258. 

 Lyriodon (Ag. ), H. G. Bronn, Index Pal. 1848, 685. — Trigonia. 

 Malaclemys (Sh.), J. E. Gray, Cat. Tortoises etc. Coll. B. M. 1844, 28. — 

 Testudo. [373. 



Megalodon, d'Archiac & de Verneuil, Tr. Geol. Soc. London [2] VI. 1842, 

 Melania, G. v. Muenster, Beitr. zur Petref. (4) 1841, 97. [Licht. 



Micrastur (111-), G. R. Gray, Genera of Birds, I. June 1849, 28. — Falco,. 

 Miliola, T. Brown, 111. Conch. G. B. I. 1827, pl. i, f. 22 [«. e^/.]. 

 Mitra, L. Reeve, Conch. Icon. II. — Mitra, no. 128, Oct. 1844. 

 Modiola, J. Hall, N. H. New York (Geol. 4 dist.) 1843, 197. 

 Mytilus, H. F. Link, Beschr. Nat. Samml. Univ. Rostock (4) 1807, 23. 

 Mytilus, Muenster in G. A. Goldfuss, Petref. German. II (6) 1837, 178. 

 Naticella, G. v. Muenster, Beitr. zur Petref. (4) 1841, 102. 

 Nisus (111.), R. P. Lesson, Traite Ornith. (i) Feb. 1830, 60.— Falco, Licht. 

 Nucula, T. Say, J. Acad. Nat. Sci. Philad. IV. Nov. 1824, 141. 

 Nucula, H. B. Geinitz, Char. Schicht. sach.-bohm. Kreidegeb. (2) 1840, 51. 

 Nucula, G. Fischer de W., Bull. Soc. Imp. Nat. Moscou, XVI. 1843 (r) 



1843, 129. [248. 



Nuculites, T. A. Conrad, J. Acad. Nat. Sci. Philad. VIU. />ost Ap. 1842, 

 Nuttainia, A. Eaton, Geol. Text Book, ed. 2, 1832, 34. 

 Orbicula, L. v. Buch, Abh. ph.-Kl. K. pr. Ak. Wiss. 1830 (1832), 181. 

 Orbicula, L. G. de Koninck, Descr. Anim. foss. (7) June 1843, 307. 

 Orbicula, G. Fischer de W., Bull. Soc. Imp. Nat. Moscou, XVI. 1843 (0 



1843, 116. [151.— Orbicula. 



Orbiculoidea (Kon.), A. d'Orbigny, Prodr. Paleont. I. 1S49 [J^^n. 1850]. 

 Oribita, T. Say, J. Acad. Nat. Sci. Philad. II. Mar. 1821, 73. 

 Orthis, G. v. Muenster, Beitr. zur Petref. (3) 1840, 79. 

 Orthis, G. v. Muenster, Beitr. zur Petref. (4) 1841, 65. 

 Ostrea, G. Fischer, Mus. Demid. III. 1807, 270. 

 Ostrea, S. Woodward, Geol. Norf. 1833, 48. 



Ostrea, Muenster in G. A. Goldfuss, Petref. German. II (4) 1833, 21. 

 Patellites, G. Wahlenberg, N. Acta Soc. Sci. Upsal. VIII. 182 1 [sep. 



1819], 75. 

 "Pecten, T. Say, J. Acad. Nat. Sci. Philad. II. Aug. 1822, 259. 

 Pecten, Defrance, Dict. Sci. Nat. XXXVIII. 1825, 253. 

 Pecten, S. Woodward, Geol. Norf. 1833, 38. [43. 



Pecten, F. C L. Koch & Dunker, B. z. K. d. Norddeutsch. Oolith. 1837, 

 Pecten, F. M'Coy in Griffith, Not. foss. Mtn. Lst. Ireland, 1842, 14 [w. «.]. 

 Pecten, E. Forbes, 13 Rept. Brit. Assoc. (Cork, 1843) 1844, 192. . 

 Pentatoma (Burm.), E. Blanchard in BruIIe, H. N. Anim. artic. (Orth. etc. ) 



III. 1840, 148. — Ciraex. 

 Perdix, J. E. Gray, Zool. Miscell. (Gray) (i) Feb. 1831, 19. 

 Perdix, J. E. Gray, 111. Indian Zool. I [1830-2] (pl. i^). 



