60S 



MEDUS.E OF THK WOULD. 



manubrium about as long as the btll-iadius. 4 inteiradial, crescentic gonads witli 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 nng-canal. Tndent-like, pitcb-fork-shaped, anas- 

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

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

 not fuse with the 8 adradial canals, in this differing from D. lobtitu. 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-s\srem 

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



Fig. 388. — Diicomedtiin philippinOj sp. nov. Drawn by tlu- author, froal 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 speciinens were found In the U. S. Fisheries Bureau steamer 

 Albatross, in Catingan Bay, Philippine Islands, on April 2D, iqo8. This medusa ma\' possibh' 

 be the ){)ung ot Piii uinlirosa [!ol\lohat(i (see Appendix) but the large size of its gonads and 

 complexly branched canals renders ibis iniprol)ai)le. 



Genus UNDOSA Haeckel, 1880. 



UndosOj Haeckel, 1880, Syst. dcr Medusen, p. 546. — Maas, 1908, Expedition Antarctique Fran^aise, Meduses, p. 9. 

 VImaris (young medusa), loc. ell., p. 545. 



The type species is Undosa unJiilat/i Haeckel, of the tmiiical Atlantic coast of Africa. 

 It is possible that Ehrenberg's Medusa strlligrra of 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 subgenitai 

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



The genus is derived from Disronirdiisn through the multiplication of lappets and ten- 

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



