﻿214 The Philippine Journal of Science 1914 



edge of the end of the lobe. In the cleft between each two 

 lobes, a rhopalar canal is given off. So, of the 8 rhopalar 

 canals, the 4 perradial canals — since they arise from the ends 

 of the stomach lobes — are short and the 4 interradial canals — 

 since they arise between the stomach lobes — are long. The 8 

 rhopalar canals extend straight to the sense organs, while the 

 8 interocular canals end in the circular canal. The area of 

 the bell between the circular canal and the margin is filled 

 with a network of anastomosing canals, taking their origin from 

 the outer surface of the ring canal and intercommunicating with 

 the branches of the rhopalar canals. Arising from the inner sur- 

 face of the circular canal on each side of each ocular canal 

 is a series of anastomosing canals usually 3 in number, which 

 joins the ocular canals by a common lateral branch. This canal 

 network has, typically, no connection with the interocular canals 



Fig. 6. Acromitus maculosus, an exumbrellar view of a portion of the bell, showing the canal 

 system as seen when injected ; somewhat diagrammatic. 



which run directly from the stomach to the ring canal without 

 branching or anastomosis. 



There is a wide band of circular muscles covering the space 

 between the margin and a line a little external to the level 

 of the ends of the stomach pouches. The part of the muscle 

 band lying within the ring canal is interrupted in the 8 

 rhopalar radii, while that outside the ring canal is only partially 

 interrupted. 



The whole medusa is pale blue in life, the color being deepest 

 along the radial canals and oral arms. The exumbrella is covered 

 with circular, ring-shaped, solid, elongated, or irregular spots. 

 In life, these are iridescent purplish black to dark brown. In 

 specimens preserved in formalin, the blue fades to slightly 

 opaque white with a faint bluish tinge and the spots fade to 

 bronze brown and finally dissappear. 



