E. W. BERGER ON THE CUBOMEDUS/E. 3 
interradii. Half way between any two points of attachment of the 
pedalia (the basal portions of the tentacles) and a little above the 
margin of the bell (cube), in a niche, hang the sensory clubs, one on 
each side, four in all. Each sensory club hangs in a niche of the 
exumbrella and is attached by a small peduncle whose axial canal 
is in connection with one of the four stomach-pockets and in the 
club proper forms an ampulla-like enlargement. 
Each club is said to lie in a perradius, and, like the tentacles, 
belongs to the subumbrella. This is shown by the course of the 
vascular lamelle, bands of cells that, stretching through the jelly 
from the endoderm to the ectoderm all around the margin, form the 
line of division between sub- and exumbrella. 
Each club has six eyes. Two of these on the middle line of the 
club facing inwards are called the proximal and distal complex eyes, 
to distinguish them from the four simple eyes that are disposed 
laterally, two on each side of the line of the two complex eyes. All of 
these eyes look inwards into the bell cavity through a thin transparent 
membrane of the subumbrella. Besides the eyes and the ampulla 
already mentioned, a concretion fills the lowermost part of the club, 
and a group of large cells, having a network-like structure and called 
network cells by Conant, fill the uppermost part of the club between 
the proximal complex eye and the attachment of the club to its 
peduncle (Plate II, Fig. 13). What is evidently nerve tissue, fibers and 
ganglion cells, fills the rest of the club, with two groups of large 
ganglion cells disposed laterally from the network cells. A sensory 
(flagellate) epithelium covers the club. 
Most Cubomeduse, among them Charybdea, have a velarium 
(comparable to the velum of the Hydromeduse), a membrane of 
tissue that extends inwards at right angles all around the margin. 
This velarium, like a velum, has a central opening through which 
the water is expelled from the bell-cavity when the animal pulsates. 
In the perradii and in the angle between the velarium and the body 
wall, are the frenula, which give support to the velarium much like 
brackets support a shelf, except that here the brackets are above the 
shelf instead of below. 
In the upper part of the bell is the stomach, with the phacelli in 
its interradii, and continued ventrally into the manubrium, or the 
proboscis. The cavity of the stomach is continued in the perradii 
through the four gastric ostia into the four stomach pockets, which 
