﻿IX, D, 3 



Light: Some Philippine Scypliomedusse 



205 



which graduate into one another — a small, inconspicuous, ribbon- 

 like form and a large, very flexible form, cylindrical at the 

 base, flattened toward the outer end, and containing a broad 

 central canal. These reach a length 

 of 110 mm. and a diameter of 7.5 

 mm., giving the animal an appear- 

 ance remarkably suggestive of the 

 classical Medusa, hence the specific 

 name. The canal system consists, as 

 usual in the genus, of an equal num- 

 ber of ocular and interocular canals. 

 The former run to the sense organs 

 at the margin, while the latter break 

 up into branches some distance in- 

 side, which anastomose with those 

 from the ocular canals to form a net- 

 work of canals running out to the margin. The subgenital ostia 

 are small and considerably longer than broad as opposed to C. 

 polypoides. 



Fig. 2. Cassiopea medusa sp. nov., 

 a sense organ and the adjacent- 

 canal system from the subum- 

 brellar side. Very much enlarged. 



Flo. 3. Cassiopea medusa, a portion of a mouth arm, showing the scattered mouths and the 

 very typical appendages. X 1. 



In the preserved specimen the disk is opaque white with a 

 slight grayish or greenish tinge. The mouths are light yellow, 

 the arms and appendages are transparent white, and the canals 

 are outlined in semiopaque white. 



