﻿ix, d, 3 Light: Some Philippine Scyphomedusx 215 



These medusae were common in the shallow water along the 

 beach at Taytay, Palawan, in April and May, 1913. Great 

 numbers of immature forms were present the second week in 

 May. They first appeared after a very severe wind storm of 

 several days' duration, but were never noted in the deeper waters 

 of the bay. 



Measurements of the type specimen in the collection of the zoological 

 department of the University of the Philippines, No. C. 2081. 



mm. 



Bell diameter 90 



Length of the mouth arms 60 

 Length of the bare proximal portion of the mouth arm 15 



Diameter of the arm disk 50 



Width of the inturned portion of the exumbrella 15 



Diameter of the largest exumbrellar spots 5 



Width of the subgenital ostia 20 



Width of the interostial pillars 15 



Numerous specimens of the different stages of this medusa 

 were collected at Taytay, Palawan, in the summer of 1913 by 

 Dr. R. P. Cowles and myself while on the joint scientific expedi- 

 tion of the University of the Philippines and the Bureau of 

 Science. During the time in which they were numerous in the 

 vicinity of Taytay, I visited neighboring islands and other parts 

 of Palawan, but was unable to find the medusa. 



Among the numerous immature specimens, some variations 

 and abnormalities are to be noted. The time at which the spots 

 appear on the umbrella seems to vary. Some specimens whose 

 umbrella is but 15 mm. in diameter show distinct spots, while 

 others which have reached a diameter of 40 mm. show no 

 markings at all. In the immature forms, the spots are arranged 

 in more or less circular groups of 4 or 5 which coalesce to form 

 the large spots of the adult form. The proximal portion of 

 the mouth arms is more prominent, and makes up a larger 

 portion of the arms of the immature medusa. The canal system 

 of the bell seems the same in mature and immature specimens, 

 but the side branches of the upper portion of the main canals 

 of the mouth arms are conspicuous in the immature forms. 

 The canal pattern is strikingly brought out by injecting pure 

 Delafield's hematoxylin through an opening in the center of 

 the exumbrella. The only notable variation is that in a very 

 few cases the inner canal network is connected to the adradial 

 canals as well as to the interradial and perradial canals. This 



