concavus Nautilus, J. De C. Sowerby, Tr. GcoI. Soc. Lonùon [2] V. 1840, expl. pI. 40. 

 concava :Keritina, ]. De C. Sowerby, :\Iin. Conch. IV. 1823, 118. 

 Xucula, H. G. Bronn, Ergeb. nat. Reisen, II. 1831,618. 

 Nummulites, Defrance, Diet. Sci. Nat. XXXV. 1825, 225. 

 Orhitolites, Lamarck, Syst. Anim. 1801, 376. 

 Orbitolites (Lam.), Defrance, Dict. Sci. Nat. XXXVI. 1825, 295.-0rbulites. 

 Orbulites, Lamarck. An. s. vert. II. I
16, 197. 

 concavum Pecten, G. Perry, Conchology, Ap. 181 I, pI. 55. 

 concavus Pecten, F. :\I'Coy in Griffith, Syn. Cub. Lst. foss. Ireland, 1844, 90. 

 concavum Platyphyllum, T. \V. Harris, Ency. .Amer. VIII. 1
3I, 42; Treat. Ins. N. 

 England, I8.p, 128. 

 concava Pleurotomaria, G. P. Veshayes, Vescr. Coq. foss. Paris, II. 1832, 246. 

 concava Pleurotomaria, G. v. :i\Iuenster, Beitr. zur Petref. (4) 1841, I 12. 

 concavus Potamides, J. Sowerby, l\lin. Conch. IV. 1822, 50. 

 concavus Potamis (Sow.), T. Brown, Ill. Foss. Conch. G. B. 1. [1843] (16), 6
.-Potamides. 

 concava Qninqueloculina, A. E. Reuss, Denkschr. k. Ak. \Viss. (\\Tien) I. 1850 [1849], 

 concava Scaeva, T. Say, J. .Acad. Nat. Sci. Philad. III. June 1823, 89' [386. 

 concavus Sigaretus, Lamarck, An. s. vert. VI (2) 1822, 208. 

 concava Skenea (Sow.), J. .Fleming, Hist. Brit. Anim. 1828, 3q.-Vermicularia. 

 concavus Syrphus (Say), C. R. \V. \Viedemann, Aussereurop. Zweifl. Insekt. II. 1830, 

 concava Terebratula, Lamarck, An. s. vert. VI (1) 1819, 251. [I30.-Scaeva. 

 concavus Terebratulites, E. F. Schlotheim, Tasch. J\Iin. 1813, 1I3. 

 concavus Trochns, J. Sowerby, :Min. Conch. II. 1817, 180. 

 concavus Trochus, J. Sowerby, J\lin. Conch. III. 1821, 12 7. 

 concava Turbinolia, Rafinesque & Clifford, Ann. gén. Sc. Phys. (Bruxelles) V. A.ug. 

 concava Turritella, T. Say, J. Aead. Nat. Sci. Philad. V. Feb. 1826, 20 7. [1
20, 235. 

 concava Turritella, J. De C. Sowerby, Min. Conch. VI. 1827, 126. 

 concava Yermetus (J. Sow.), J. De C. Sowerby, Min.. Conch., Alph. Index, It)40, I 1.- 

 concava Vermicularia, J. Sowerby, .Min. Conch. I. 18 I 4, 125. [Vermicularia. 

 concava Vermilia, T. Brown, Ill. Foss. Conch. G. B. 1. [184;-9], 24 1 . 

 concelata Pholadomya, J. L. R. Agassiz, Etudes crit. l\loll. foss. (2) 18 4 2 , 12 9, 

 concentralis "Haematopota, F. \Valker, List Dipt. ColI. B. 
1. (I) 1848, 207. 

 concentrice-costellata Modiola, C. F. Roemer, Texas, 18 49, 403. 

 concentrice-punctatus Pecten, A. E. Reuss, Yerst. boehm. Kreidef. II. 1846, 28. 

 coneentricostata Pleurotoma, L. Reeve, Conch. Icon.-Pleurotoma, no. 279, Dec. 1845. 

 concentrico-striatus Avicula (l\I'Coy), A. d'Orbigny, Prodr. Paléont. I. 1849 [Jan. 1850], 

 136.-Pecten. 

 concentrico-striatus Pecten, F. l\I'Coy in Griffith, Syn. Carbo Lst. foss. Ireland, 1844, 9 1 . 

 concentrica Achatina, L. Reeve, Conch. Icon. \T.-Achatina, no. 106, June 1849. 

 eoncentrica Acmaea, A. E. Reuss, Verst. bot:hm. Kreidef. II. Ü
46, 110. 

 concentrica 
\ctinia, A. H..isso, II. N. Europe, V. 1826, 286. 

 concentricus Aneylus, A. d'Orbigny, Syn. ::\1011. Am. mérid. in Magasin de Zoot. V. 

 concentrica Arca, G. v. 
luenster, Beitr. L;ur Petref. (3) 18 4 0 , 54, [rt)35, 
q. 

 concentrica Arca, G. v. Muenster, Beitr. zur Petref. (4) 1841,82. 

 concentrica Arcopagia (Reuss), A. d'Orbigny, Pal. Franç., Crét. III (Lam.) 1845, 410. 

 - Tellina. [\ enus, Born, 1778. 

 Artemis (Gm.), T. A. Conrad, Amer. J\larille Conch. (4) [? 18 3 2 ], 55,- 

 .Arthemis (Lam.), G. P. Deshayes, Traité élém. Conch., Atlas, 1850, 13, 

 pI. 20. -Cytherea. 

 Astarte, T. .\. Conrad, J. Acad. Nat. Sci. Philad. YII. post Sept. 18 34, 133. 

 Astarte, G. A. Goldfuss, Petref. German. II (6) 18 37, 195. 

 Astrea, Defrance, Diet. Sci. Nat. XLII. 1826, .
86. 

 .\strea, J. W. Vancleve, P. Amer. 
\ssoc. 18+8 (1849), 22 [11. 11.]. 

 ..\thyris (Buch), F. lVl'Coy in Griffith, Syn. Carbo Lst. foss. Ireland, It)44, 

 147.-Terebratula. [I7.-Terebratula [noll t:omp.]. 

 Atrypa (Schloth.), F. J\I'Coy in Griffith, Not. foss. l\Itn. Lst. Ireland, 1842, 

 Aucella (Fisch.), A. K.eyserling, \Viss. Beob. l'etschora, 1846, 300.- 

 Inoceramus, Park. 



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