118 BULLETIN OF THE 
myxa. My astonishment was considerable when there was brought to 
light an internal economy which reminded one rather of an orange than 
of an Echinoderm. A horizontal cut, just above the joint of the radial 
shields, disclosed a quantity of membranous partitions stuffed with a sort 
of pulp and radiating in a confused manner; while a vertical section 
showed a cavity, which might be the stomach, surrounded by and com- 
municating witha number of convolutions or blind-sacks. The matter 
became clear only by giving up the idea that a strict correspondence 
with known forms was to be looked for. 
Passing upward through the mouth of a Gorgonocephalus, and getting 
above the mouth-papillæ, d (Plate I. fig. 1), and tentacles, r, we come to 
the usual contractile aperture, which may well be called the stomach- 
sphincter, du. It is considerably wrinkled, or even a little papillose on 
its border, and opens into a flattened cavity, the stomach, St. Thus 
far, the structure is normal, but beyond this point all is novel. In- 
stead of remaining simple, the stomach passes outward and upward. into 
a number of membranous pouches, which, in profile, present a fluted 
aspect, SU, St’. Their outer ends are attached in three ways ; first, St”, 
they stretch upwards and are strongly fixed to the roof of the disk-wall ; 
secondly, they reach horizontally and grow to the inner points of the 
egg-bearing lobes, 6, 6; thirdly, they incline downwards, and are power- 
fully attached at ten points encircling the mouth. Of these points five 
are brachial, St! (Fig. 2) ; and five interbrachial, St. It is to the outer 
open angle of the mouth-frames that the latter are attached, by a part 
of the floor of the stomach, which is there much thickened, à f (Fig. 1). 
Immediately above this attachment opens out the much folded and 
fluted interbrachial stomach-pouch, St” (Fig. 2), which, at its outer end, 
adheres to the inner points of the corresponding genital lobes; and, 
above, grows fast to the roof of the disk. In like manner there is a 
brachial attachment to the upper side of each arm, St’; and above it 
opens a brachial stomach-pouch which has a similar shape, and is made 
fast at corresponding places. From these ten points the attachment of 
the stomach-floor is continued outward over radiating lines, respectively 
across the interbrachial spaces and along the tops of the arms, quite to 
the body-wall. This structure would divide the body-cavity in ten 
radiating compartments completely separated from each other, were it not 
that an open space exists between the inner point of each attachment 
and the stomach-sphincter, ôf (Fig. 1). This open space corresponds to the 
ring-canal surrounding the entrance to the stomach of Ophiurans (inner 
perihemal canal, Ludwig), but differs in being a mere continuation of 
