﻿212 The Philippine Journal of Science im 



While resembling Lychnorhiza and Crambione to some extent 

 in its canal system, in having filaments on the mouth arms 

 and in the presence of radiating furrows in the sensory pits, 

 it differs from them in having an axial terminal appendage, 

 in that the internal branches of the ring canal join the rhopalar 

 canals, and in that the circular muscles are interrupted, partially 

 at least, in the rhopalar radii. It differs from Mastigias in that 

 the exumbrella sensory pit is furrowed, in that the interocular 

 canals are regular in number (8) and in position and do not 

 anastomose, running directly from the central stomach to the 

 ring canal, and in that the axial terminal appendages of the 

 mouth arms are long, slender filaments and not clubs. It differs 

 from Pseudorhiza in having slender terminal appendages, in 

 the presence of filaments on the mouth arms, in that the sensory 

 pits are furrowed, and in the absence of a central mouth. It 

 differs from Phyllorhiza in having axial terminal appendages 

 and in that the inner branches of the ring canal do not reach 

 the stomach. It differs from Versura in that the interradial 

 canals are separate and in the presence of a definite ring 

 canal. It differs from Lobonema most strikingly in the small 

 size of the marginal lappets and in the absence of windowlike 

 apertures in the oral arms. It differs from Lobonemoides 

 gen. nov. in that there are not more than 8 rhopalia, in that 

 the interocular canals do not extend to the margin, and in 

 that the axial, terminal appendages of the mouth arms are 

 filamentous. 



Acromitus maculosus sp. nov. (figs. 4, 5, and 6). 



Type. — No. C. 2081, zoological collection, University of the 

 Philippines. 



The bell reaches a width of 90 mm. or more, and is hemi- 

 spherical or somewhat flatter than a hemisphere. It has a 

 solid consistency, being thick in the central region and thin out- 

 side the ring canal. The surface of the exumbrella is covered 

 with minute, bluntly cone-shaped projections. There are 8 

 rhopalia, each with a pigmented area and a deep, triangular, 

 grooved, exumbrellar sensory pit. The marginal lappets are 

 typically 80 in number — 8 pointed velar lappets in 4 pairs and 

 2 narrow pointed ocular lappets being present in each octant. 

 The grooves between the pairs of velar lappets are deep, and 

 extend some distance up on the exumbrellar surface. The arm 

 disk is about 1.2 or 1.25 of the bell radius. The genital ostia 

 are from 1.3 to 1.5 as wide as the column between them. They 

 have a regular but sinuous outline, and are partially closed by 



