Allman, on Carduella cyathiformis. 
127 
From the outer side of the walls of the stomach there extend 
to the umbrella eight membranous vertical lamellse (figs. 3, 
4, d) . These are so arranged, that from each of the angles along 
which one of the four generative bands runs two lamellse are 
given off, and thence diverging at a wide angle, are attached 
by their outer edges to the inner surface of the umbrella, 
along a longitudinal ridge (e), which also gives attachment to 
one of the lamellse of the neighbouring pair. There are thus 
four of these ridges, each giving attachment to two lamellae, 
and situated alternately with the four angles of the 
stomach to which the opposite edges of the lamellae are 
attached. 
The result of this arrangement is the formation of eight 
spaces, four of which (/) are situated externally, while the 
other four {g) alternate with these and lie internally. 
The four outer spaces are closed above, and their roof thus 
forms the oral disc [h) of the animal; while the four inner spaces 
are open, and allow a needle to be passed down along the 
side of the stomach the whole way as far as the peduncle. 
Each of the four ridges, along which the vertical laminse 
are attached to the inner edge of the umbrella, seems to be 
traversed through its entire length by a canal. They are 
visible in the living animal through the walls of the umbrella, 
where they appear as four pale- coloured lines, extending sym- 
metrically from the summit of the peduncle as far as the 
tentacular circle. 
Running along the bases of the tentacles, so as to form a 
continuous circle at some distance within the margin of the 
disc, is a deep reddish-brown line (i), which I have no hesi- 
tation in viewing as a circular canal, into which the tubular 
tentacles all open. 
Upon the inner surface of the stomach are eight longitu- 
dinal rows of tubular appendages [k) , two rows being situated 
in each of the four intervals between the generative bands. 
They are finely ciliated on their surface, and have their walls 
loaded with large thread- cells. 
I have not satisfactorily made out the structure of the 
peduncle ; but it seems to present the principal parts demon- 
strable in the body, namely, the umbrella, stomach, and 
generative bands, compressed into a smaller space and less 
distinguishable from one another. 
Round the margin of the umbrella runs a band of circular 
muscular fibres (/), which performs the ofiice of a sphincter 
in closing the mouth of the umbrella during the contracted 
state of the animal ; while other fibres radiate in the oral 
disc, where they may be seen converging from the circular 
VOL. VIII, o 
