. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . name indicates theform as well as the size of this little brownish jellyfish, which is foundnear the Florida Keys, extending in lines for considerable distances. GENUS Pelaf/ia P. cyanellfi. Umbrella spherical, margin scalloped, tentacles eightin number; four long appendages ruffled on the edges hang from themouth; size about two inches in diameter; appendages four incheslong; color pink. (See next page.) SrnoKDKi; RHIZOSTOMJE The Rhizostomae, or root-mouth jellyfishes, are ve
. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . name indicates theform as well as the size of this little brownish jellyfish, which is foundnear the Florida Keys, extending in lines for considerable distances. GENUS Pelaf/ia P. cyanellfi. Umbrella spherical, margin scalloped, tentacles eightin number; four long appendages ruffled on the edges hang from themouth; size about two inches in diameter; appendages four incheslong; color pink. (See next page.) SrnoKDKi; RHIZOSTOMJE The Rhizostomae, or root-mouth jellyfishes, are very remark-able. They have no tentacles, but covering the end of the manu-brium and hanging from it like tentacles are oval appendageswith numerous minute funnel-like apertures, called suctorialmouths. As the manner of locomotion of jellyfishes is peculiarto themselves, so also is this many-mouthed development unique in the animal kingdom. The ty] I this group, described below, is found on the Florida Keys. The different species vary indiameter from three to eight inches. 140 MARINE INVERTEBRATES GENUS Cassiopeia. Pclayia cyanella. C. frondosa. This specieshas a circular disk, on themargin of which are sixteensense-organs (tentaculocysts),but no tentacles. The lowerend of the manubrium, whichin other jellyfishes is an openmouth, is closed by eight armswhich emanate from it and areusually extended laterally, ly-ing parallel to the disk. Thesearms are much branched, andthe branches, in turn, havenumerous appendages. Someof these appendages look likelittle polyps and have mouthssurrounded by crowns of ten-tacles ; others are ovoid bodieswithout external openings, butwith a central cavity connectedwith vessels leading to thearms. The former are mouths,but the function of the ovoidbodies is not known. Althoughable to swim freely, Cassiopeialies usually on its back, as ifattached, and languidly opensand closes its disk, rarelychanging its position. Its arms,extending upward, appear li
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