﻿IX. D, 3 



Light: Some Philippine Scyphomedusx 



201 



Measurements of Aurellia labiata. 



Specimen. 



Diameter 



of the 

 umbrella. 



Diameter 



across the 



zone of 



gonads. 



Length of 

 each 

 mouth 

 arm. 



A 



mm. 

 225 



167 

 160 

 145 



mm. 

 107 

 86 

 65 

 50 



mm. 

 100 

 71 



B 



C - 



D 



65 





Order RHIZOSTOMJE 



RHIZOSTOMATA PINNATA Vanhoffen 

 Genus CASSI0PEA Peron and Lesueur, 1809 

 Cassiopea polypoides Keller var. culionensis var. nov. (fig. 1). 



Type. — No. C. 2420, zoological collection, University of the 

 Philippines. 



The disk is flat, from 120 to 150 mm. in diameter, with a 

 broad, shallow sucker cavity and a central thickened area. The 

 thickened outer margin of the sucker cavity 

 is from 15 to 20 mm. from the margin of 

 the bell, and the diameter of the sucker is 

 about two-thirds of the bell diameter. The 

 margin is thin and divided into from 16 

 to 20 parameres by as many sense organs. 

 There are twice as many radial canals as 

 sense organs, and there is no ring canal. 

 Each paramere has 5 blunt marginal lappets, 

 the lappet in the center of each paramere 

 being the largest, the 2 ocular lappets being 

 about one-half as wide as the 2 on each 

 side of this central lappet. The sense or- 

 gans show no pigment spot. The mouth 

 arms are from 1.25 to 1.5 as long as the 

 bell radius, and project considerably beyond 

 the bell margin. They are cylindrical or 

 somewhat dorsally flattened in their proximal portions and 

 higher than broad in their distal portions. The arms give rise 

 in their proximal portion to about 3 pairs of short, alternately 

 arranged lateral branches beyond which the arm divides to form 

 from 3 to 5 long branches which may in turn subdivide. There 

 are numerous, small, berrylike vesicles between the mouths over 

 the entire surface of the arms. In most specimens, there is 

 a central flattened appendage in the center of the arm disk 



Fig. 1. Cassiopea poly- 

 poides Keller var. 

 culionensis var nov., a 

 sense organ from the 

 subumbrellar side. 

 Much enlarged. 



