CASSIOPEA XAMACHANA. 2?>1 



for supposing that their later history is different. At any rate, we have la-re the lirsl, 

 fairly complete history of the development of a scyphomedusa from the Imd; :ind when 

 the sexual development of CiixxiojH'it .mmachana 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 Aealephae. Illustrated catalogue of the Museum of comp. zool. at Harvard College. No. 2, 1865, 



p. 41. 



'81. Polyclonia frondosa. Nature, vol. 24, 1881, p. 609. 

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



'99. Acalephs from the Fiji Islands. Bull. mus. comp. zool., vol. 32, uo. 9, 1899. (Description of Citssiopea ndroxia.) 

 Agassiz, L. 



'60. Contributions to the natural history of the United States of America. Vols. 3 and 4. Boston, 1800. 

 Archer, H. 



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

 Berger, E. W. 



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



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

 Bigelow, R. P. 



'90 The marginal sense organs in ilic Pelagidae. Johns Hopkins Univ. circ., vol. 9, 1890, no. 80, p. 65. 



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



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



in p. 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 beobachteten Sdiiruniualleii. Mem. 



Acad. imp. sci. St. Petersbourg, sci. math. phys. et nat., (6) vol. 4 (pt. 2, sci. nat., vol. 2), 1838, pp. 394-3!>'.. 

 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 liber die Polypen und Quallen der Adria. Denkschr. d. math.-naturw. Classe d. k. Acad. d. Wissen- 



schafteu, Wien, Bd. 38, 1877. 



'81. Ueber einige bislang noch unbekannte Larvenstadien von Hhiznstoma. Zool. Anz., 1881, No. 7(1. p. 79. 

 '83. Untersuehungen fiber die Organisation und Entwicklung der Medusen. Prag and Leipzig, 1883, 9(5 pp., 20 pis. 

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

 '90. Ueber die Entwickluug dps Seyphostoma von Cotylorhiza, Aurelia, und Chrysaora, I. Arb. zool. Inst., Wien, 



vol. 9, 1890, p. 29. 



'92. Ueber die Entwicklung dfs Sc\ phnstoma von Cotylorhiza, Aurelia und Chrysaora, sowie iiber die Kystrmatisrlie 

 Stellung der Scyphomedusen, II. Arb. a. d. zool. Inst. d. Univ. Wien, vol. 10, 1H92, pp. 1-70. 



