SCYPHOMEDUSAE COLLECTED BY STEAMER " ALBATROSS." 207 



surfaces of which bear numerous mouth-openings and vesicles. 

 There are four gonads and four separate subgenital cavities. There 

 are more than eight marginal sense-organs and twice as many radial- 

 canals as sense-organs. The radial-canals are placed in communica- 

 tion one with another by means of an anastomosing network of ves- 

 sels. A well-defined ring-canal may or may not be present, but is' 

 commonly absent. 



CASSIOPEA ANDROMEDA, var. BADUENSIS Mayer. 



Medusa andromeda Forskal, 1775, Descript. que in Itinere Orientali Ob- 



servait, Hauniae, p. 107, pi. 31. 

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

 Cassiopea andromeda, var. oaduensis Mayer, 1915, Publication No. 212, 



Carnegie Institution of Washington, p. 183. 



A specimen of this medusa (Cat. No. 28730, U.S.N.M.) 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 oS^^£^0^ { ' ■'■'■ - V- 

 with 18 rhopalia. There are four to eight, X^-^^ipw^S'^l^ 



wim 15 rnopaiia. inere are tour to eignt, ^v^'-' r, >*I ; l m#2WPP 



usually six, lappets between successive -■S^^^.^S0^?M: : ii 



rhopalia. The arm-disk is octagonal, 36 



mm. wide, and the eight mouth-arms are ^ fe 



each 34 mm. long and definitely bifur- V; 



cated, the forks being 16 mm. long, thus ^ 



nearly half as long as the total length of 



the mouth-arms. There are no append- fig. 12. — cassiopea andbomeda, 



ages among the mouth-arms, but these ^^lZ7iIZV°Zl 



may have been lost. The color has wholly view on the right ; aboeal 



faded in formalin. VIEW 0F BELL ON THE LEFT - 



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, and is herewith figured. 



The bell is 61 mm. in diameter. There are 22 marginal sense- 

 organs and (5X22) 110 bluntly rounded, barely perceptible, evenly 

 spaced marginal lappets all similar each to each. The arm-disk is 

 about one-third as wide as the bell-diameter and the mouth-arms are 

 compressed dorso-ventrally and when fully expanded extend slightly 

 beyond the bell-margin, but in their ordinary state of contraction 

 they do not quite reach the bell-margin. The side branches of these 

 mouth-arms are short, but each arm is bifurcated at its outer end, the 

 forked part being about one-third as long as the entire arm. There 

 are about 20 slender, flat, tapering, central arm-disk appendages of 

 various lengths, the longest of which is at the center of the oral side 



