﻿210 The Philippine Journal of Science wu 



grade as to make it necessary to consider them as local forms 

 of a single very variable species. 



The largest specimen in the collection measures 60 mm. in 

 bell diameter, and the arm disk is 33 mm. in diameter. The 

 arms measure 35 mm. in length from the center of the arm 

 disk, and project only slightly beyond the edge of the disk. 

 There are 8 rhopalia, with large, cup-shaped, pigmented ocelli 

 and long, pointed, ocular lappets. Between each 2 sense organs 

 are 9 rounded or bluntly pointed velar lappets. The subgenital 

 ostia are three times as wide as the interostial pillars. There 

 are 7 anastomosing interocular canals in each octant. The 

 rounded clubs are scattered on the mouth arms, and the terminal 

 appendages which are somewhat less in length than the bell 

 diameter are distinctly 3-sided and show a network of internal 

 canals. The general color in life is light greenish blue, shading 

 into light brown, purple, or olive green. The exumbrella is 

 covered, particularly in the mature medusa, with prominent white 

 spots. Those above the ring canal are double-headed or dumb- 

 bell shaped. The rhopalar canals are outlined by a broad violet 

 or deep blue band. The arm clubs are violet or blue at the 

 tip and base with intermediate zones of olive green, gray, and 

 white. In preserved specimens the colors fade with the excep- 

 tion of the violet band on the circular canal, which is not 

 present in some immature medusae, and the violet bases of 

 the terminal appendages. 



Genus ACROMITUS novum 7 



Generic characters. — Rhizostomata triptera with scattered 

 filaments and axial, terminal, filamentous appendages on the 

 oral arms. The cruciform stomach gives rise to 16 radial 

 canals, 8 of which are rhopalar and 8 adradial and inter- 

 rhopalar. The rhopalar canals extend beyond the ring canal 

 to the margin, while the adradial canals end in the ring canal. 

 Externally, the ring canal sends off many small canals which 

 anastomose and form a network between the ring canal and 

 the margin. Internally, it gives off several larger canals on 

 each side of each rhopalar canal which anastomose and join 

 the rhopalar canals. The exumbrellar sensory pits show radiat- 

 ing furrows. The subgenital porticus is unitary and cruciform. 

 The circular muscle is partially interrupted in the rhopalar radii. 



The type species is A. maculosus sp. nov. from Taytay Bay, 

 Palawan. 



: oiKpos, at the point, terminally; niros, a thread. 



