213 



Special Description. This species is very similar to Cassiopea 

 andromeda Esch. and to C. polijpoides Keller. It differs from]tlie first, 

 as described and figured by Tilesius, in the shape of the umbrella; 

 in having much longer and stouter oral arms with ten or more primary 

 branches that are never triangular in section; in having much larger 

 oral vesicles; and never anything corresponding to the flattened con- 

 dition of the ultimate branches figured by Tilesius and mentioned 

 byHseckel. The arrangement of the white spots and other color 

 markings is also somewhat different. It is distinguished from the se- 

 cond by having fewer of the large oral vesicles and having these of a 

 smaller size; by having more slender and graceful oral arms than 

 those figured by Keller, with a greater number of primary branches; 

 and by a difference in the coloration. A more extended account of 

 the anatomy and development of this species with illustrations is now 

 in course of preparation. 



Color. The animal has a general greenish brown tint due to the 

 presence of »green cells« in the jelly. There are Avhite markings, si- 

 milar to those described above, on the dorsal side of the oral arms and 

 their larger primary branches. The subumbrella is marked with a bl ue 

 circle around the stomach and from this a blue band extends outwa rd 

 to the periphery along each interrhop aliai radius. The oral funnels 

 are also colored blue, grading into brown near their margins. The 

 very small vesicles on the oral disk are reddish brown while the large 

 vesicles are greenish yellow with a longitudinal bluish green stripe. 



Size. The largest specimens were about 12 cm in diameter. 



Ontogeny. The development from the q^^ has not been obser- 

 ved but in this species the production of buds by the scyphistoma plays 

 an important part in reproduction. The bud is set free as a ciliated, 

 hollow, planula-like body consisting of a layer of ectoderm and one 

 of entoderm with a thick supporting layer between , in which is em- 

 bedded the four septal muscles. 



The mouth is formed during this stage at what was apparently 

 the distal end of the bud. The larva then becomes fixed and develops 

 into a scyphistoma. 



The strobilization is monodiscous. The rhopalia are formed in the 

 basal portions of every alternate one of the 32 tentacles. This is 

 followed by the absorption of the distal portions of these tentacles 

 after which the other tentacles are absorbed. The septal funnels do 

 not appear until very late and disappear soon after the medusa is set 

 free. When set free, the medusa has a simple quadrate mouth. Soon 

 after, the lips grow out to form the eight oral arms and, at] the 

 tips of these , the formation of the characteristic funnels and vesicles 



