(iOli 



MEDUSAE OF THE WORLD. 



lappets. 24 (8X3) hollow tentacles 2 to 3 times as long as the bell-diameter. Throat-tube 

 1.5 times as long as the bell-radius and as the 4 complexly tolded, leaf-shaped lips. The 

 central stomach gives rise to 16 unbranched radial-canals which are pined one to another by 

 a marginal ring-canal. 4 interradial crescentic gonads with their convexities outward. 

 These project from the floor of the subumbrella. There are no subgenital pits. The gonads 

 are lined on their inner, concave sides by a row of gastric cirri. Color ( ?) Found at New 

 Caledonia, New Guinea, and the Cocos Islands in the tropical Pacific and Indian Oceans. 



Another specimen called "Floscula pandora" by Haeckel, 1 880 (p. 643), is from the tropical 

 Pacific. The bell is 30 mm. wide, without a star-like marking upon the exumbrella, and with 

 a short throat-tube hardly one-fourth as long as the long, narrow mouth-arms. Tentacles as 

 long as the bell-radius. Lappets oval, sharp pointed, 1.5 times as long as broad. 



These medusae appear to be immature, although Haeckel states that the gonads contained 

 ripe eggs, but he studied only preserved specimens and cut no sections. 



FIG. 385. "Floscula promethfa." 



FIG. 386. "Floresca farlhenia.' 



After Haeckel, in Das Syst. der Medusen. 



Genus DISCOMEDUSA Claus, 1877. 



Discomedusa, CLAUS, 1877, Denkschrift, Wien. Acad., Bd. 38, p. 42. 

 Ulmaris+Umbrosa, HAECKEL, 1880, Syst. der Medusen, p. 545. 

 Umbrosa, MAAS, 1908, Expedition Antarctique Fran^aise, Meduses, p. 9. 



The type species is Discomedusa lobata Claus, 1877, of the Mediterranean. This may 

 prove to be an arrested variety of Haeckel's UnJosa undulata of the west coast of tropical 

 Africa. In UnJosa, however, there are 40 tentacles and 48 lappets, whereas in Discomedusa 

 there are 24 tentacles and 32 lappets. 



GENERIC CHARACTERS. 



Ulmaridae with 24 (3X8) tentacles, 32 (4X8) lappets, and 8 sense-organs. The ten- 

 tacles arise from the clefts between the marginal lappets. There are 8 simple, unbranched 

 adradial canals, 8 branched, perradial and interradial canals, and a marginal ring-canal. 



Haeckel's genus Ulmarts is apparently only the young of Discomedusa in a stage wherein 

 there are only 8 tentacles and 16 lappets. His genus UnJosa bears the same relation to Disco- 

 medusa that Dactylometra does to Chrysaora, the tentacles and lappets having increased from 



