408 A CENTUEY OF SCIENCE 



had much influence on the biological studies of the time, 

 and which form a basis for many of our present concepts. 

 The importance of these papers warrants the list being 

 given in full. The titles are here in many cases abbre- 

 viated and the subjects consolidated. 



General views on Classification, 1, 286, 1846. 



Zoophytes, 2, 64, 187, 1846 ; 3, 1, 160, 337, 1847. 



Genus Astraea, 9, 295, 1850. 



Conspectus crustaceorum, 8, 276, 424, 1849 ; 9, 129, 1850 ; 11, 

 268, 1851. 



Genera of Gammaracea, 8, 135, 1849; of Cyclopacea, 1, 225, 

 1846. 



Markings of Carapax of Crabs, 11, 95, 1851. 



Classification of Crustacea, 11, 223, 425 ; 12, 121, 238, 1851 ; 

 13, 119 ; 14, 297, 1852 ; 22, 14, 1856. 



Geographical distribution of Crustacea, 18, 314, 1854; 19, 6; 

 20, 168, 349, 1855. 



Alternation of Generations in Plants and Eadiata, 10, 341, 

 1850. 



Parthenogenesis, 24, 399, 1857. 



On Species, 24, 305, 1857. 



Classification of Mammals, 35, 65, 1863 ; 37, 157, 1864. 



Cephalization, 22, 14, 1856 ; 36, 1, 321, 440, 1863 ; 37, 10, 157, 

 184, 1864; 41, 163, 1866; 12, 245, 1876. 



Homologies of insectean and crustacean types, 36, 233, 1863; 

 47, 325, 1894. 



Origin of life, 41, 389, 1866. 



Relations of death to life in nature, 34, 316, 1862. 



Of the above, the articles on cephalization as a funda- 

 mental principle in the development of the system of 

 animal life have attracted much attention. The evidence 

 from comparative anatomy, paleontology, and embry- 

 ology alike supports the view that advance in the 

 ontogenetic as well as in the phylogenetic stages is cor- 

 related with the unequal growth of the cephalic region as 

 compared with the rest of the body. Dana shows that 

 this principle holds good for all groups of animals. His 

 homologies of the limbs of arthropods and vertebrates, 

 however, do not accord with more modern views. 



Other papers on the same and allied topics were pub- 

 lished by Dana in other periodicals. His most conspicu- 

 ous zoological works, however, are his reports on the 

 Zoophytes and Crustacea of the United States Explor- 



