﻿IX, D, 3 



Light: Some Philippine Scyphomedusse 



223 



increasing in size toward the center. They are small, slender, 

 and flexible, and reach a length of 2 mm. and a basal diameter 

 of 0.5 mm. In preserved specimens they lie flat on the disk. 



There are 14 rhopalia and twice as many radial canals, all 

 extending to the margin. The sense organs are very short, thick 

 clubs lying at right angles to the plane of the bell with the 

 swollen end toward the exumbrellar surface. Between each 

 pair of sense organs, there are 6 marginal lappets — 4 large 

 pointed triangular velar lappets between 2 small pointed ocular 

 lappets. The rhopalar canals are somewhat larger than the 

 interrhopalar canals, and divide distally to form a U-shaped 

 sinus in the upper part of the ocular lappets. In the curve 



Fig. 11. Lobonemoides gracilis gen. et sp. nov., ventral view of the medusa. X I- Two of the 

 mouth arms of this specimen are aborted. 



between the limbs of this sinus lies the sense organ. The ex- 

 umbrellar sensory pit is dendritically grooved. The ring canal 

 lies at the outer edge of the swollen central region of the bell, 

 and its greatest breadth is at right angles to the plane of the 

 umbrella. The radial canals curve over this swollen area to the 

 ring canal, which gives off externally and internally a set of anas- 

 tomosing canals. The external network is connected in a 

 number of places with both the ocular and interocular canals, 

 and it approaches the latter more closely and is joined to it 

 in a greater number of places. Internally, a network of 3 

 or 4 anastomosing canals is given off by the ring canal on 

 each side of each ocular canal to which it is joined in 2 or 3 



