﻿228 



The Philippine Journal of Science 



1914 



These are about 0.5 mm. in basal diameter and 

 0.75 mm. high. They are scattered over the 

 surface, are about 2 mm. apart at the margin, and 

 increase in number toward the apex, where they 

 are only about 0.5 mm. apart. Scattered among 

 these on the sides of the exumbrella are a few 

 low, flatly rounded papilla? about 1.5 mm. in 

 diameter and 0.5 mm. in height. 



Each of the 8 rhopalia shows a distinct, brown, 

 pigmented area. There are typically 8 thin, 

 rounded, velar lappets in each octant. The free 

 outer ends and the deep irregular grooves between 

 them are free from the projections found on 

 the rest of the exumbrella. The width of these 

 lappets is variable, and their outer ends sometimes 

 show bifurcation. 



The canal system is very similar to that of 

 R. hispidum Maas, the 16 radial canals extending to the margin. 

 Each adradial canal shows a sinuslike swelling at the point 

 of origin of its innermost and largest branch. The radial 



Fig. 14. Rhopilema 

 visayana s p . 

 nov., an exum- 

 brellar view of a 

 sense organ, 

 showing the ad- 

 jacent canals as 

 seen in an in- 

 jected specimen. 

 Enlarged. 



Fig. IB. Rhopilema visayana, subumbrellnr view of a quadr»nt. showing; the canal system, the 

 radial muscles, and the subgenital ostium with the (line papilla. \ J. 



