SCYPHOMEDUSAE COLLECTED BY STEAMER ALBATROSS. 



221 



ring-canal join with the central stomach, as in Mastigias, instead of 

 ending blindly as in Lychnorhiza. The canal-system resembles that 

 of Mastigitis, but the mouth-arms have no terminal clubs. 



PHYLLORHIZA LUZONI Mayer. 



Phyllorhiza luzoni Mayee, 1915, Publication No. 212, Carnegie Institution 

 of Washington, p. 194, fig. 7. 



Two specimens of this medusa were captured at a depth of 150 

 feet in Varadero Bay, Southern Luzon, Philippine Islands, on July 

 23, 1908. Cat. No. 28728, U.S.N.M. Unfortunately both became 

 somewhat macerated in the preservative fluid. 



The bell of the larger and more perfect specimen is 60 mm. wide, 

 flat, and with finely granular exumbrella. Eight rhopalia without 

 ocelli in formalin and without exumbrella pits. Sixteen scimeter- 

 shaped rhopalar lappets, and (9X8) 

 72 rounded velar lappets which are 

 somewhat wider but not longer than 

 the rhopalar lappets, so that the gen- 

 eral contour of the bell-margin is 

 circular, without deep niches in the 

 rhopalar radii. 



The arm-disk is cruciform, 32 mm. 

 in perradial and 20 mm. in interradial 

 diameter. The subgenital ostia are 

 14 mm. and the perradial columns 

 8 mm. wide, and the subgenital por- 

 ticus is wide and unitary. 



The eight mouth-arms are slender 

 and strongly compressed laterally, their lower parts being 3-winged 

 with deeply incised lateral membranes. The naked outer part of 

 each upper arm is 13 mm. and the 3-winged lower part only 11 mm. 

 long. Any appendages which may have existed among the mouth- 

 frills have disappeared in the preservative fluid, owing to the macera- 

 tion of the specimens. 



The muscular system of the subumbrella consists of a broad, unin- 

 terrupted zone of weakly developed circular muscles. In other 

 hitherto known species of Phyllorhiza the muscles are interrupted 

 in the eight principal radii. 



The central stomach is cruciform, 32 mm. in perradial and 16 mm. 

 in interradial diameter. Eight radial-canals arise from the stomach 

 and extend straight to the eight rhopalia ; these main canals are 

 connected one with another by a ring-canal which is 6 mm. inward 

 from the margin of the bell. In each octant six to nine radiating 

 vessels arise from the cruciform stomach anastomosing in an irregu- 

 lar network with one another and with the eight main canals. On 





Fig. 20. — Phyllorhiza luzoxi from 

 Varadero Bat, Luzon. 



