STAUROMEDUS^E HALICLYSTUS. 



533 



developed strands of longitudinal muscle-fibers. Alternating with these are 4 perradially 

 situated, longitudinal chambers which communicate with the central stomach in the umbrella. 

 There are 8 broad, adradial gonads, grouped into 4 interradial pairs. Each gonad is wide 

 and triangular. These gonads begin a little above the point of junction of the stalk with the 

 disk and extend to the ends of the 8 arms. Each gonad contains 100 to 150 out-tolded sacs 

 arranged in 6 to 8 radiating, longitudinal rows. Gastric cirri numerous. 



Fi<;. 



i). Halielystus auricula, after Clark, in Smithsonian Contributions to Knowledge. The smaller 

 figures arc of natural size and illustrate characteristic attitmlrs. 



Color very variable, but each medusa is commonly of one color, parti-colored individuals 

 being very rare. Individuals are cither blue, green, yellow, olive, orange, or very rarelv red, 

 pink, or violet. Medusa; of brownish and purple hues are also common. 



