MEDUS/E OF THE WORLD. 



Toreuma dieuphila. 



Cassiopea dieuphila, PERON ET LESUEUR, 1809, Annal du Mus. Hist. Nat. Paris, tome 14, p. 356. 



Cassiopea thtophila, DE LAMARCK, 1816, Hist. Nat. Anim. sans Vert., tome 2, p. 511. 



RhKosloma thtophila, ESCHSCHOLTZ, 1819, Syst. der Acalephen, p. 53. 



Pol\clotnia thtophila, AGASSIZ, L., 1862, Cont. Nat. Hist. U. S., vol. 4, p. 159. 



Toreuma theophila+ T. lhamnosloma+T . gegenbauri, HAECKEL, 1880, Syst. der Meduscn, pp. 566, 567, 645. 



It is probable that Haeckel's T. " thamnostoma" and "T. gegenbauri" are only growth- 

 stages of Peron and Lesueur's "Cassiopea" dieuphila. I therefore present the descriptions 

 of the three forms side by side in order that they may readily be compared. Haeckel enjoyed 

 the opportunity of studying Peron and Lesueur's original specimen preserved in Pans. 



Genus CASSIOPEA Peron and Lesueur, 1809. 



Cassiopea, PERON ET LESUEUR, 1809, Ann. du Mus. Hist. Nat. Paris, tome 14, genre 24, p. 356. ESCHSCHOLTZ, 1829, Syst. 

 der Acal., p. 42. TILESIUS, 1834, Acad. Caes. Leop. Nova. Acta., torn. 15, p. 256. BRANDT, 18^8, Mem. Acad. Imperiale 

 des Sci., St. Petersbourg, Sci. Nat., ser. 6, tome 4, p. 396. GUPPY, 1883, Nature, vol. 27, p. 31 (habits). VON LEND ENF ELD, 

 1884, Proc. Linnean Soc.New South Wales, vol. 9, p. 284. CLAUS, 1883, Organisation und Entwick.der Medusen, p. 60. 

 COLASANTI, 1886, Atti Acad. Med. Roma, Anno. 12, 18 pp. (blue color). AGASSIZ AND MAYER, 1899, Bull. Mus. Comp. 

 Zool. at Harvard College, vol. 32, p. 175. KELLER, C., 1883, Zeit. fiir wissen. Zool., Bd. 38, p. 632. BROWNE, 1905, Fauna 

 and Gcog. Maldive and Laccadive Archipelagoes, vol. 2, p. 966. MAAS, 1903, Scyphomedusen der Siboga Expedition, 

 Monog. u, pp. 38, 80. SCHULTZE, L. S., 1898, Abhandl. Senckenberg. Gesell., Bd. 24, Heft. 2, p. 163. 



Cassiopea+ pol\clonia, AGASSIZ, L., 1862, Cont. Nat. Hist. U. S., vol. 4, pp. 139, 155, 159. PERKINS, 1908, Papers from Tortugas 

 Laboratory of Carnegie Inst. of Washington, Publication 102, p. 150. 



Polyc/onia + Cassiopea, HAECKEL, 1880, Syst. der Medusen, pp. 567, 568. 



The type species is Medusa andromeda Forskal, called C. forskalca by Peron and Lesueur 

 ( = C. andromeda, Eschscholtz) of the Red Sea and Indian Ocean. The first species des- 

 cribed by Peron and Lesueur, 1809, is called Cassiopea dieuphila. Haeckel, 1880, however, 

 places this in the genus Toreuma. 



GENERIC CHARACTERS. 



Rliizostomata pinnata with 8 (4 pairs of) adradial, complexly branched mouth-arms 

 the lower or ventral surfaces of which hear numerous mouth-openings and vesicles. There 

 are 4 gonads and 4 separate subgenital cavities. There are more than 8 marginal sense- 

 organs and twice as many radial-canals as sense-organs. The radial-canals are placed in 

 communication one with another by means of an anastomosing network of vessels. A definite 

 ring-canal may or may not be present. 



