A STUDY OF METAMERISM. 471 



the simple ways already tried by phylogenists and embryo- 

 logists is, it seems to me, a vain hope. But a more vigorous 

 study of the facts of metameric repetition from the standpoint 

 reached above might lead us in the right direction. A 

 study of a larger number of facts than we possess at present 

 will at least tell us whether or not metamerism is to be re- 

 ferred to this category. If this should prove true, we shall 

 know where to search for the key to the problem. Even if 

 there is no immediate hope of reaching a definite conclusion, 

 yet we shall have gained much if we can find in what direction 

 the solution lies. 



Bibliography. 



1. Andkews, E. a. — " Report upon the Annelida Polychseta of Beaufort, 



North Carolina," ' Proceed. U. S. Nat. Museum,' vol. xiv, 1891. 



2. Balfouk. — * Comparative Embryology,' 1879. 



3. Bateson.— " The Ancestry of the Chordata," 'Quart. Journ. Micr. 



Sci.,' xxvi. 



4. Bateson. — 'Materials for the Study of Variation,' 1894. 



5. Beddard. — 'Proceed. Zool. Soc.,' 1886. 



6. Benham, W. B. — 'Anuals and Magazine of Nat. Hist.,' ser. 6, vii, 



1891. 



7. Berg, R. S. — "Untersuchungen iiber den Bau und die Entw. d. Ge- 



schlechtsorgane der Eegenwiirmer," ' Zeit. f. wiss. Zool.,' xliv, 1886. 



8. Beooks. — "Sal pa in its Relation to the Evolution of Life," 'Stud. 



Biol. Lab. Johns Hopkins Univ.,' May, 1893. 



9. Brooks.— "Lucifer," 'Phil. Trans.,' 1882 (reprinted); ' Morpho- 



logical Monographs,' 1884. 



10. Buchanan, P. — "Peculiarities in the Segmentation of certain Poly- 



chsetes," 'Quart. Journ. Micr. Sci.,' xxxiv, 1893. 



11. Caldwell. — " Blastopore, Mesoderm, and Metameric Segmentation," 



' Quart. Journ. Micr. Sci.,' xxv, 1885. 



12. Clatjs. — "Zur morphologischen und pbylogenetischen Beurtheilung des 



Bandwurmskorpers," ' Arb. aus d. Zool. Inst. Wien,' viii, 1889. 



13. CoRi, C. J.— "Ueber Anomalien der Segmentirung bei Anneliden," 



' Zeit. f. wissen. Zoologie,' liv, 3, 1892. 



14. FiELDE, Adelene M. — " Observations on Tenacity of Life and Regene- 



ration of Excised Parts in Lurabricus terrestris," 'Proceed. 

 Acad. Nat. Science,' 1885. 

 VOL. 37, PART 4. — NEW SER. I I 



