APPENDIX C. 291 



R. S. Williamson, Vol. V. Appendix, Article I., pp. 313-316. 

 One plate. 4to. Washington, 1856. 



Nota bene. This is the only paper on fossil fishes written by 

 Agassiz, after leaving Europe in 1846. 



1857. 307. Obituary of Francis C. Gray. Proc. Amer. Acad. 

 Arts and Sc., Vol. III., pp. 347-349. Boston, January, 1857. 



1857. 308. On the correspondence of different stages of em- 

 bryonic development with the different stages of geological succes- 

 sion. Proc. Amer. Acad. Arts and Sc., Vol. III., pp. 353-354- 

 Boston, January, 1857. 



1857. 309. On de Beaumont's theory. Proc. Amer. Acad. 

 Arts andSc., Vol. III., p. 355. Boston, January, 1857. 



1857. 310. The order to which Ammonites belong. Proc. 

 Amer. Acad. Arts and Sc., Vol. III., pp. 35 6 -357- Boston, Feb- 

 ruary, 1857. 



1857. 311. The family of Naiades. Proc. Amer. Acad. Arts 

 andSc., Vol. III., pp. 3?8-379- Boston, March, 1857. 



1857. 312. Nouvelle espece d'Esoce du Lac Ontario. L'lnsti- 

 tiit, Vol. XXV., p. 128. Paris, 1857. 



!857. 313. Letter from Professor L. Agassiz, in "Prefatory 

 remarks," by G. R. Gliddon, in Indigenous Races of the Earth, 

 pp. xiii-xv. 4to. London and Philadelphia, 1857. 



1857. 314. Various existing systems of classification of fishes. 

 Proc. Amer. Acad. Arts and Sc., Vol. IV., pp. 8-9. Boston, 

 December, 1857. 



1857-1862. 315. Contributions to the natural history of the 

 United States of America. 4vols. 4to. Boston, 1857-1862. Vols. 

 I. and II. were published in 1857; Vol. III., in 1860; Vol. IV., in 

 1862. Contents: Vol. I., Essay on classification. North Ameri- 

 can Testudinata. Vol. II., Embryology of the Turtle. Vol. III., 

 Acalephs in general. Ctenophorae. Vol. IV., Discophorae. - 

 Hydroidae. Homologies of the Radiata. Announced in the Pro- 

 spectus as a work of ten quarto volumes, only four of which uvn 

 published. 



