CASSIOPEA XAMACHANA. 231 



for supposing that their later history is different. At any rate, we have here the first 

 fairly complete history of the development of a scyphomedusa from the bud; and when 

 the sexual development of Cassiopea xamachana or an allied species is studied, this 

 memoir will serve as a means of comparison, and will make it possible to determine 

 whether or not the two modes of ontogeny are alike. 



LITERATURE. 



Agassiz, A. 



'65. North American Acalephae. Illustrated catalogue of the Museum of comp. zool. at Harvard College. No. 2, 1865, 



p. 41. 



'81. Polyclonia frondosa. Nature, vol. 24, 1881, p. 509. 

 Agassiz, A., & Mayer, A. G. 



'99. Acalephs from the Fiji Islands. Bull. mus. comp. zool., vol. 32, no. 9, 1899. (Description of Cansiopea ndrnsia.) 

 Agassiz, L. 



'60. Contributions to the natural history of the United States of America. Vols. 3 and 4. Boston, 1860. 

 Archer, H. 



'81. Medusae. Nature, vol. 24, 1881, p. 307. 

 Berger, E. W. 



1900. Physiology and histology of the Cuboinedusae, including Dr. F. S. Conant's notes on physiology. Mem. biol. 



lab. Johns Hopkins Univ. vol. 4, no. 4. 

 Bigelow, R. P. ^ 



'90. The marginal sense organs in the Pelagidae. Johns Hopkins Univ. oirc., vol. 9, 1890, no. 80, p.5. 



'92a. On reproduction by building in the Discomedusae. J. H. U. circ., vol. 11, 1892, no. 97, p. 71. 



'92b. On the development of the marginal sense organs of a rhizostomatons medusa. J. H. U. circ., vol. 11, 1892. 



no. 97, p. 84. 



'92c. On a new species of Cassiopea from Jamaica. Zool. Anz., Jahrg. 15, 1892, no. 393, pp. 212-214. 

 '93. Some observations on Polyclonia frondosa. J. H. U. circ., vol. 12, 1893, no. 106, p. 106. 

 Brandt, J. F. 



'38. Ausfiirliche Beschreibung der von C. H. Martens auf seiner Weltumsegelung beobachteteii Schirmquallen. Mem. 



Acad. imp. sci. St. Petersbourg, sci. math. phys. et nat., (6) vol. 4 (pt. 2, sci. nat., vol. 2), 1838, pp. 394-399. 

 Brooks, W. K. 



'86. The life history of Hydromedusae, a discussion of the origin of medusae and the significance of metagenesis, 



Mem. Boston soc. nat. hist., vol. 3, no. 12, 1886 ; also Mem. biol. lab. Johns Hopkins Univ., vol. 1. 

 Claus, C. 



'77. Studien tiber die Polypen und Quallen der Adria. Denkschr. d. math.-naturw. Classe d. k. Acad. d. Wissen- 



schaften, Wien, Bd. 38, 1877. 



'81. Ueber einige bislang noch unbekannte Larvenstadien von Rhizostoma. Zool. Anz., 1881, No. 76, p. 79. 

 '83. Uutersuchvmgen fiber die Organisation und Entwicklung der Medusen. Prag and Leipzig, 1883, 96 pp., 20 pis. 

 '84. Die Ephyren von Cotylorhiza und Rhizostoma. Arb. zool. Inst. Wien, vol. 5, 1884, p. 169. 

 "90. Ueber die Entwicklung des Scyphostoma von Cotylorhiza, Aurelia, und Chrysaora, I. Arb. zool. Inst., Wien, 



vol 9, 1890, p. 29. 



"92. Ueber die Entwicklung des Scyphostoma von Cotylorhiza, Aurelia, und Chrysaora, sowie iiber die systematise-lie 

 Stellung der Scyphomedusen, II, Arb. a. d. zool. Inst. $. Univ. Wien, vol. 10, 1892, pp. 1-70. 



