BY E. VON LENDENFELD, PH.D. 287 



Umbrella similar to a mitre. Central dome with a very thick 

 wall, flat bell-shaped, thickly set with 20 or 30 large and many 

 small gi-annlated conic protuberances. Deep circular groove. In 

 every Octant 8 large rectangular coalescing velarflaps between two 

 small deeply-set ocular flaps. The two compressed forks of the 

 arm double as long as-the upper arm. Their distal ends projecting 

 beyond the margin of the Umbrella. Filaments long and numerous. 

 Four particularly stout ones on the Pillar-forks. 



Size : 100-120 mm. diameter of Umbrella ; height, 30-40 mm. 



Locality : Carolina Islands, Samoa Islands. Godeffroy. 



Genus. Polyrhiza. 



ToreumidsB with 8 bifurcate mouth arms, the branches are 

 doubly bifurcate or dichotomous. The upper arm extends beyond 

 the first bifurcation. Long brachial filaments between the crisps, 

 8 large ocular canals, and between them numei'ous smaller radial 

 canals. Without evident ring canal. 8 marginal bodies. 



Species. Polyrhiza homopneusis. 



Haeckel, System der Medusen. Seite, 577. 



Homopneusis frondosa. Lesson, 1829. Voyage de la Coquille, 

 Mollusques, plate. XII. 



Homopneusis frondosa. L. Agassiz, 1862. Monogr. of Acal. 

 Contrib. to the Nat. H. of the U.S.A. Vol. IV, p. 159. 



Umbrella flat cap-shaped. The central Umbrella disc flat. 

 Depressed in the centre. With 16 simple radial furrows. Deep 

 circular groove. Margin centrifugal of this groove as broad as the 

 central part. In every Octant 8 short, pointed velar flaps between 

 two small ocular flaps. Arms much dichotomously branched, each 

 with 6 or 8 thicker branches. Filaments short and numerous. 

 Arm branches projecting far beyond the margin of the Umbrella. 



Size : Diameter of Umbrella, 60-80 mm. Height, 15-20 mm. (?) 



Locality : New Guinea. Waigan Islands. Lesson. 



Species. Polyrhiza orithyia. 

 Haeckel, System der Medusen. Seite, 578. 



