640 MEDTJS.E OF THE WORLD. 



of a radial-canal to each sense-organ and an equal number of intermediate radial-canals. 

 These radial-canals are put into communication one with another by means ot an anastomosing 

 network of vessels, without any distinct ring-canal. 



The medusa is dark-green without spots or pattern of any sort. This green color is due 

 to an infesting alga, one of the ZooxanthelLr. The chlorophyl is readily dissolved out in 

 alcohol. 



This medusa is abundant in muddy bottoms in shallow bays and back waters at Febidu, 

 Maldive Islands, Indian Ocean. It is a well-marked variety of C. andromcda being distin- 

 guished by the hand-shaped appendages on its mouth-arms. 



Cassiopea andromeda var. acycloblia Schultze. 



Cassiopeja acycloblia, SCHULTZE, L. S., 1898, Denkschrift.Med. Nat. Ges. Jena., Bd. 8, p. 459, taf. 33, fign. 2, 4, 6; taf. 34, fig. 15. 

 Cassiopeja anilromeJa var. cyclobalia, MAAS, 1903, Scyphomedusen der Siboga Exped., Monog. n, p. 40. 



Bell flat with low central dome (?) at middle of the exumbrella. 16 marginal sense-organs 

 and 80 (5X16) marginal lappets. Exumbrella flecked with 16 large, oval, radially placed, 

 white spots above the sense-organs. A wide ring of white binds these spots together. There 

 is also a small, white fleck on the exumbrella side of each lappet. Those of the interradial 

 lappets fuse with the white ring. Mouth-arms only three-fifths as long as bell-radius. Diam- 

 eter of arm-disk less than disk-radius. The mouth-arms branch dichotomously each with 

 one large and many small filaments. Amboina, Molucca Islands. 



Cassiopea polypoides Keller. 

 Cassiopea polypoides, KELLER, 1883, Zeit. fiir wissen. Zool., Bd. 38, p. 632, taf. 36, 37, fign. 6-23. 



Disk flat, shield-shaped, 100 to 150 mm. wide. A well-developed, sucker-like depression 

 at center of exumbrella, the thickened, outer edge of which is 15 to 20 mm. inward from bell- 

 margin. Margin of umbrella is thin, but at the center there is a disk-like thickening of the 

 gelatinous substance of the exumbrella. There are 16 marginal sense-organs each with a 

 red-brown ectodermal pigment spot and a terminal entodermal mass ot concretions. 80 

 short, rounded, marginal lappets, 3 velar and 2 ocular in each of the 16 parameres. 1 he 

 thick mouth-arm disk is octagonal with 8 equal sides. The 8 mouth-arms are about as long 

 as radius of umbrella and project beyond the bell-margin; they are somewhat higher than 

 wide at their distal ends. Each arm usually gives rise to 3 pairs of alternately arranged, 

 pinnate branches, with frilled mouths on their under sides. There are numerous clubs and 

 filaments on the under sides of the mouth-arms, the largest filaments being over 30 mm. 

 long. The 4 subgemtal ostia are small, oval, and elongated in a radial direction. Central 

 stomach 4-sided. 32 radiating canals extend outward from the stomach, 1 6 to the sense- 

 organs and 16 to intermediate parts of the margin; these 32 vessels connect one with another 

 by an anastomosing network of vessels, but there are no specialized ring-canals. 



Exumbrella light-brown with a broad, white ring which gives out 16 cog-wheel-like, 

 forked branches on its outer edge in the radii of the 16 sense-organs. There is also a short, 

 white, radial spot on the exumbrella side of each marginal lappet. 16 dull white, spoke-like 

 pigment areas in the gelatinous substance of the exumbrella extend outward from the edges 

 of the central thickening to near the margin in the radii of the sense-organs. The suctorial 

 mouths are intense brown. Appendages and filaments of mouth-arms very variable in color, 

 being sky-blue, greenish-blue, horny-yellow, translucent white, or rose-red. In one variety 

 the exumbrella is olive colored with indistinct radiating spots. 



Keller distinguishes five varieties based on color and differences in number of the mouth- 

 arm filaments as follows: 



Cyanea. With 5 or 6 large, sky-blue or green-blue filaments on each mouth-arm. The white oral tufts are numerous, 



the clubs rarer. This is the commonest form. 



Flava. The large filaments are twisted, never flattened, their color is horny-yellow or translucent. Common. 

 Albida. The large filaments are twisted and white in color. Rare. 

 Rosea. Exumbrella olive colored, radial spots indistinct. Some of the filaments are round, some flat, and of rose-red 



color. Club-shaped vesicles rare. Rare variety. 

 Herbacea. The mouth-arm appendages poorly developed. No filaments. The mouths of the arms large. Rare variety. 



