Meduse of the Philippines and of Torres Straits. 195 
Genus VERSURA Haeckel, 1880. 
Crossostoma preoccupied for mollusks by Norris and Lycett, 1850. 
Crossostoma, Acassiz, L., 1862, Cont. Nat. Hist. U.S., vol. 4, p. 155. 
Versura+Crossostoma, HAECKEL, 1880, Syst. der Medusen, pp. 605, 607. 
GENERIC CHARACTERS. 
Rhizostomata triptera with clubs and filaments upon the mouth-arms. The 
4 perradial canals arise directly from the stomach, but the 4 interradial canals 
result from the fusion of a number of anastomosing vessels which arise from 
the interradial sides of the stomach. There is no definite ring-canal, but 
merely a marginal network of vessels. There are no radial-muscles in the 
subumbrella, but the ring-muscles are well developed. Among the characters 
409988 
Hnasans 
AAT ae 
USSY, 
Fia. 7.—Phyllorhiza luzoni from Varadero Bay, Luzon. Five arms are represented as if cut 
off close to the arm-disk. The muscular system is shown above, and the gastro-vascular 
canals below 
of minor importance, the subgenital ostia are wide openings, wider than the 
columns between them, and the sense-organs have a simple, exumbrella pit 
without radiating furrows. At the center of the arm-disk is a prominent, 
raised cluster of frilled mouths having filaments between them. 
Versura maasi Mayer. 
Versura maasi, Mayer, 1910, Medusz of the World, vol. 3, p. 687, fig. 416. 
Named in honor of Professor Dr. Otto Maas, in recognition of his notable 
researches upon medusz. Described in Mayer’s ‘“‘Medusz of the World.” 
A single perfect specimen was obtained by the United States Fisheries Bureau 
steamer Albatross on April 8, 1908, along the shore at Mantacao Island, west 
coast of Bohol, Philippine Islands. 
