INTRODUCTION. 15 



1842. 



Morton, S. G., Description of some new species of organic remains of the Cretaceous group of the United States: Acad. 



Nat. Sci. Philadelphia Jour., lstser., vol/8, pp. 207-215, 216-227, 1842. 

 d'Orbignt, A., Voyage dans l'Amerique meridionale, Pal6ontologie ; text in vol. 3; plates in vol. 8, 1842. 

 Coquilles et echinodermes fossiles de Colombie, recueill6s par M. Boussingault, 1842. 



1844. 



Forbes, E. D., On the fossil shells collected by Mr. Lyell from the Cretaceous formations of New Jersey: Geol. Soc. 

 London Proc, vol. 4, pp. 307-310, 1844. 



1846^7. 



Agassiz, L., and Desor, E., Catalogue raisonne des families, des genres, et des especes de la classe des Echinodermes: 

 Ann. sci. nat. (zool.), 3d ser., vol. 6, pp. 305-374, 1846; vol. 7, pp. 129-168, 1847; vol. 8, pp. 5-35, 355-381, 1847. 



Bronn, H. G., Index palseontologicus, 2 vols., 2,361 pp., 1848. 



1849. 



Roemer, F., Texas, mit besonderer Rucksicht auf Deutsche Auswanderung und die physischen Verhaltnisse des 

 Landes nach eigener Beobachtung geschildert; mit einem naturwissenschaftlichen, Anhange und einer topogra- 

 phisch-geognostischen Karte von Texas, 1849. 



1850. 



d'Orbignt, A., Prodrome de paleontologie; Terrains cretaces (Senonien); Echinodermes, vol. 2, pp. 268-275, 1850. 

 Conrad, T. A., Description of one new Cretaceous and seven new Eocene fossils: Acad. Nat. Sci. Philadelphia Jour., 



2d ser., vol. 2, pp. 39-41, 1850. 

 Michelin, Hardouin, Notice sur deux especes d'echinides fossiles: Rev. etmag. zoologie, 2d ser., vol. 2, p. 240, 1850. 

 Ravenel, E., On the Recent Squalidae of the coast of South Carolina, and catalogue of the Recent and fossil echino- 



derms of South Carolina: Am. Assoc. Adv. Sci. Proc, vol. 3, pp. 159-160, 1850. 



1851. 



Bayle and Coquand, Memoire sur les fossiles secondaires recueillis dans le Chili par M. Ignace Domeyko: Soc. g6ol. 



France Mem., vol. 2, No. 4, pp. 1-47, Pis. I-VII, 1851. 

 Bronn, H. G., Lethjea geognostica, 3 vols, and Atlas, 1851-1856. 



1852. 



Roemer, F., Die Kreidebildungen von Texas und ihre organischen Einschltisse, 1852. 



1853. 



d'Archiac, C. A., et Haime, J., Fossiles nummulitique de l'lnde, p. 214, 1853. 



Shumard, B. F., Paleontology of the exploration of the Red River of Louisiana in the year 1852: Rept. of Capt. R. B. 



Marcy, U. S. Army, pp. 199-211, 1853* 

 Giebel, C. G., Beitrag zur Palaeontologie des Texanischen Kreidegebirges : Naturwiss. Ver. in Halle Jahresb. fiir 



1852, pp. 358-375, Pis. VI, VII, 1853. 



1853-1856. 



d'Orbigny, A., Pal6ontologie francaise; Description des animaux invertebre's; Terrains cretacfe (Echinides), vol. 6, 

 1853-1860. 



1854. 

 d'Orbigny, A., Note rectificative sur divers genres d'Echinoi'des: Revue et mag. zool., 2d ser., vol. 6, pp. 16-28, 1854. 



1855. 



Schiel, James, List and description of organic remains collected during the exploration of the Central Pacific Railroad 

 line, 1853-54: Pacific Railroad Repts., vol. 2,'pp. 108-109, Pis. I-IV, 1855. 



1857. 



Hall, James, Geology and paleontology of the boundary: United States and Mexico Boundary Survey Rept., vol. 1, 

 pt. 2, pp. 101-174, 1857. 



Meek, F. B., and Hayden, F. V., Description of new species and genera of fossils, collected by Dr. F. V. Hayden in 

 Nebraska Territory, under the direction of Lieut. G. K. Warren, topographical engineer, U. S. Army: with some 

 remarks on the Tertiary and Cretaceous formations of the Northwest, and the parallelism of the latter with those 

 of other portions of, the United States and Territories: Acad. Nat. Sci. Philadelphia Proc, vol. 9, pp. 117-148, 1857. 



