﻿204 The Philippine Journal of Science uu 



of the mouth arms. It has besides the berrylike vesicles a 

 small central appendage, surrounded by a double whorl of 8 

 appendages, 2 in the axil between each two arms supported 

 by the same interostial pillar. The appendages of the inner 

 whorl are smaller than those of the outer whorl. Near the 

 distal end of each arm is a large ribbonlike appendage reaching 

 a length of 15 mm. and a width of 4 mm., which is surrounded 

 by a number of similar but smaller appendages. Besides these, 

 there are scattered among the mouths a number of small leaf like 

 appendages. 



The entire medusa is, in formalin, a dull grayish white. 



Measurements of the specimen in millimeters: Diameter of 

 the bell, 55 ; diameter of the arm disk, 25 ; length of the mouth 

 arms (measured from the center of the disk), 26. Number of 

 sense organs, 17; number of lappets to a paramere, 5. 



While this is probably an immature individual of C. polypoides 

 forma typica, it is impossible to place it definitely, so I have 

 indicated it as a doubtful immature example of that species. 



Cassiopea medusa sp. nov. (figs. 2 and 3). 



Type. — C. 2421, zoological collection, University of the Phil- 

 ippines, from Culion Bay, Culion. 



The disk is flat with a broad, shallow sucking surface bounded 

 externally by a circular raised area and having a broad thickened 

 central disk. The disk measures 260 mm. in diameter, the suck- 

 ing surface 180 mm., and the raised central disk 115 mm. 

 The raised margin of the sucking surface is 15 mm. wide, 

 and its outer edge is 25 mm. from the bell margin. 



There are 17 sense organs, and each paramere contains 7 

 irregular, very blunt marginal lappets which are often more 

 distinct as spaces between grooves in the exumbrella than as 

 actual lappets in the very thin and nearly smooth margin. 

 The sense organs are very small, slender clubs hidden in deep 

 clefts. They are covered above by a shelf of exumbrellar tissue, 

 but they are quite distinct from the subumbrellar side. They 

 are without pigmented eyespots. The 8 large mouth arms arise 

 from an 8-sided arm disk 114 mm. in diameter. They are 

 170 mm. in length, send off numerous small lateral branches 

 in their proximal portion, and divide distally into 3 main 

 branches, which are again subdivided. The mouths and branches 

 are much more scattered than in C. polypoides, and arising in 

 the axils of the branches and between the mouths from the 

 center of the disk to the distal ends of the branches are hundreds 

 of transparent appendages. These appendages are of two types 



