(il)S 



OF THK WORLD. 



manubrium about as long as tbe bell-radius. 4 mterradial, crescentic gonads with their con- 

 vexities outward and with a single row of simple unbranched gastric cirri along their inner 

 sides. These gonads are about 5 times as wide as the perradial interspaces between them. 

 Central stomach 15 mm. wide. 8 simple, unbranched, adradial canals arise from central 

 stomach and proceed straight outward to ring-canal. Trident-like, pitch-fork-shaped, anas- 

 tomosing canals arise from the 8 (perradial and interradial) sides of the stomach and break 

 up into a network of vessels which fuse with the ring-canal. These networks, however, do 

 not fuse with the 8 adradial canals, in this differing from D. lobata. On its outer side the 

 ring-canal gives rise to 64 simple, unbranched, blindly-ending diverticula; a pair in each 

 lappet. In formalin the gelatinous substance is transparent and the entodermal canal-system 

 dull milky. The gonads appear to be mature, but the preservation is such that I can not be 



FIG. 388. Discomednsa philippina, sp. nov. Drawn by the author, from speci- 

 mens obtained by the U. S. Fisheries Bureau steamer Albatross in 

 Catingan Bay, Philippine Islands, April 20, 1908. 



certain that this is the case. Six specimens were found by the U. S. Fisheries Bureau steamer 

 Albatross, in Catingan Bay, Philippine Islands, on April 20, 1908. This medusa may possibly 

 be the young ot Parumbrosa pol \labat a (see Appendix) but the large size oi its gonads and 

 complexly branched canals renders this improbable. 



Genus UNDOSA Haeckel, 1880. 



Undosa, HAF.CKEI, 1880, Syst. der Medusen, p. 546. MAAS, 1908, Expedition Antarctique Francaise, Mcduses. p. 9. 

 Ulmaris (young medusa), loc. cil., p. 545. 



The type species is UnJosa unJulata Haeckel, of the tropical Atlantic coast ot Africa. 

 It is possible that Ehrenberg's Medusa stcllt^cra ot the Mediterranean may be identical with 

 this species, but it is so imperfectly described that it is unrecognizable. 



GENERIC CHARACTERS. 



Ulmaridae with 8 sense-organs, 48 (8X6) marginal lappets, and 40 (5X8) tentacles which 

 arise from the clefts between the lappets. 4 interradial protrusive gonads without subgi-nital 

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



The genus is derived from DiscomeJusa through the multiplication ot lappets and ten- 

 tacles. During the growth of the medusae they pass through a " DiscomeJusa" stage. 



