Medusa* of the Philippines and of Torres Straits. 



183 



Genus CASSIOPEA Peron and Lesueur, 1809. 



Cassiopea, PERON ET LESUEUK, 1809, Annal. du Mus. Hist. Nat. Paris, tome 14, genre 24, p. 356. 



GENERIC CHARACTERS. 



Rhizostomata pinnata with 8 (4 pairs of) adradial, complexly branched 

 mouth-arms, the lower or ventral surfaces of which bear 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 well-defined 

 ring-canal may or may not be present, but is commonly absent. 



Cassiopea andromeda var. baduensis, nov. var. 



Medusa andromeda, FORSKAL, 1775, Descript. que in Itinere Oriental! Observavit, Hauniae, p. 



107, tab. 31. 

 Cassiopea andromeda, ESCHSCHOLTZ, 1829, Syst. der Acalephen, p. 43. 



A specimen of this medusa is from Endeavour Strait between Australia and 

 New Guinea, and was found by the Albatross on December 23, 1908. The 

 bell is 101 mm. in diameter, flat without an aboral depression, and with 18 





FIG. 3. Cassiopea andromeda var. baduensis. Aboral view of half of the exumbreila 

 on the left. Oral view of 4 of the mouth-arms on the right. 



rhopalia. There are 4 to 8 usually 6 lappets between successive rhopalia. 

 The arm-disk is octagonal, 36 mm. wide, and the 8 mouth-arms are each 34 mm. 

 long and definitely bifurcated, the forks being 16 mm. long, thus nearly half 

 as long as the total length of the mouth-arms. There are no appendages 

 among the mouth-arms, but these may have been lost. The color has wholly 

 faded in formalin. 



Another specimen of this medusa was found at Badu Island, Torres Straits, 

 Australia, within a few miles of Endeavour Strait, by the Expedition of the 

 Carnegie Institution of Washington, on November 5, 1913, and was studied 

 alive. 



