Medusce of the Philippines and of Torres Straits. 105 



Genus VERSURA Haeckel, 1880. 



Crossostoina preoccupied for mollusks by Norris and Lycett, 1850. 

 Crossostoma, AGASSIZ, L., 1862, Cont. Nat. Hist. U. S., vol. 4, p. 155. 

 Versura-^r Crossostoina, HAECKEL, 1880, Syst. der Medusen, pp. GOG, 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 



FIG. 7. Phyllorhiza luzoni from Varadero Bay, Luzon. Five arras 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, Medusas of the World, vol. 3, p. 687, fig. 410. 



Named in honor of Professor Dr. Otto Maas, in recognition of his notable 

 researches upon medusae. Described in Mayer's "Medusae 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. 



