BULLETIN OF THE 
DESCRIPTION OF PLATES. 
PLATE I. 
Fig. 1. %. Vertital cross-cut through a part of the disk of a female Gorgonocephalus 
Pourtalesii, and through one arm not quite parallel to its axis, 3xposing a section 
r, mouth-tentacles; d, mouth- 
of the mouth-frame, f, and of the arm-bones, w°:- 
papille ; du, mouth-sphincter, above which is the passage into the stomach, St, whose 
floor has a stout attachment to the open angle of the mouth frames, leaving a large 
ring, 6f which gives free communication between the radiating compartments of the 
body-eavity. Above and beyond the cavity of the stomach are the stomach-pouches, 
SU, St’, which are attached at their outer ends to the roof of the disk-wall, and to 
the inner points of the ovarial lobe, 0. 
Fig. 2. $. Vertical section of a part of Gorgonocephalus Pourtalesii just above the 
mouth, showing a portion of one brachial and two interbrachial spaces of the body- 
cavity, looking from the centre outward. The stomach is cut away along its floor, St, 
and again above, where it passes into the thin-skinned lobes, 44”, Se”, which have pow- 
erful attachments below at the outer open angle of the mouth-frames. In the centre 
is the inner end of the arm, Am, to whose upper side is strongly attached a stomach- 
pouch, Sí. These pouches have therefore ten strong attachments round the mouth, five 
brachial and five interbrachial. In their midst, like a cylindric bag, rises the base of 
the stomach proper, which leaves between its wall and these attachments a large an- 
nular space, giving free communication from the radiating compartments of the 
body-cavity to outer surfaces of the stomach-pouches and the ovarial lobes. Thus, an 
egg from any of the ovarial lobes could pass out by any one of the ten genital 
openings. 
Fig. 3. +. A horizontal cross-cut through a part of the disk of Gorgonocephalus 
Pourtalesii, just above the arms, and passing through the outer ends of the radial 
shields, 7, 7, the ovarial lobes, 6, ô and the stomach-pouches, St”, which radiate 
from the stomach, St, and adhere by their outer ends to the inner points of the ovarial 
lobes, 9,0. These adherent ovarial lobes and stomach-pouches are arranged in ten 
radiating groups, which are attached also below (compare Fig. 2), and thus divide 
the body-cavity into ten radiating compartments, each emptying outwardly by a gen- 
ital opening, #0, and communicating within, by a ring-tube (ô f, Fig. 1), with the 
other compartments. The stomach-pouches are usually filled with a coagulated, 
pasty substance, while the stomach proper is empty. 
Fig. 4. ^9. Cross-cut of the inner end of an ovarial lobe of Gorgonocephalus Pour- 
talesii showing the egg-clusters and the enclosing membrane, which is thickened at 
its extremity. 
PLATE II. 
Fig. 5. $. Vertical cross-cut of Euryale aspera, including three arms, one mouth- 
ions of two others, f. At the ends are two mueh dilated 
'omplete, and se 
