﻿216 The Philippine Journal of Science 1914 



connection is very slight, and is by no means common. One 

 specimen has 5 stomach lobes, 5 gonad lobes, 9 mouth arms, 

 18 radial canals — 10 of them rhopalar and 8 adradial — and 96 

 marginal lappets. There are 9 rhopalia present, and as the 

 margin is gone at the end of another rhopalar canal we may 

 say there are 10 rhopalia, so it is as if a new area equivalent 

 to a quadrant has been developed in this specimen to correspond 

 to the extra stomach lobe, lacking, however, two adradial canals. 

 In another specimen there are 18 canals, but 5 of them — 3 

 adradial and 2 rhopalar — arise from a single enlarged stomach 

 pouch. Another specimen has 10 mouth arms, 4 of them develop- 

 ing from a single interostial pillar, but the canal system is 

 of the normal type. At first glance, the canal system of the 

 bell of this species appears to be very similar to that of Catos- 

 tylus purpurus Mayer, to which it is undoubtedly closely related. 

 But in the injected specimens of C. purpurus it can be seen that 

 the internal network of canals from the ring canal is connected 

 most conspicuously with the adradial canals, while in A. macu- 

 losus it is connected with the rhopalar canals and typically not 

 at all with the adradial canals. 



I have given the species the name maculosus, as the spots 

 on the umbrella constitute one of its most striking specific 

 characters. 



Genus L0B0NEMA Mayer, 1910, emended 



Generic characters. — Rhizostomata triptera, in which the velar 

 lappets are greatly extended, tapering to pointed ends. The 

 mouth arms show numerous filaments, and the mouth-arm mem- 

 branes are perforated by windowlike openings. There are from 

 8 to 16 rhopalia, twice as many radial canals as rhopalia, and a 

 ring canal which gives off an anastomosing network of vessels on 

 both its inner and outer sides. The inner network does not 

 connect with the stomach. All of the radial canals extend 

 beyond the ring canal, the ocular canals always to the sense 

 organs. The subumbrella shows a well-developed system of 

 ring muscles extending from the mouth-arm disk to the margin, 

 interrupted partially or not at all by the radial canals. There 

 are numerous prominent tapering papilla? upon the exumbrella. 

 There is an exumbrellar sensory pit above each rhopalium, whose 

 floor is covered with radiating dendritic furrows. 



This is Mayer's original definition emended so as to include 

 Lobonema maycri sp. nov. 



