340 — Prof. M‘Intosh on Cephalodiscus, a new Type 
large ova are situated. The former often occur in groups, each 
individual, however, except in the case of buds, being perfectly 
free, at liberty to wander anywhere along the chambers or 
externally through the apertures. In some cases they are 
packed closely together in the cavity: but such may have 
been due to the condition on immersion in spirit; for thin 
partitions, bridles, and pillars of the transparent coencecium 
often separate the individuals. Moreover, in turning out the 
latter, an operation performed with ease, owing to the fria- 
bility of the ccencecium, at first sight it may almost be fancied 
that an ovigerous envelope contaiing embryos is before us, 
so remarkable is the profusion of eggs and animals, and ap- 
parently so active is the reproductive function. The aspect 
of the adults and their caudal buds, the proportionally large 
size of the ova, and other features, however, negative such a 
supposition. 
Each adult polypide (and they are somewhat uniform in 
size) measures, from the extremity of the cephalic plumes to 
the tip of the pedicle, about 2 millim.; and of this length the 
body proper (that is, from the buccal disk to the posterior 
bulbous region above the pedicle) is rather more than 1 millim. 
The body in most is bean- or kidney-shaped, generally more 
rounded and bulbous posteriorly, since there is a tendency to a 
forward curve before the pedicle comes off. ‘The dorsal sur- 
fuce is smooth and convex, a slight lateral constriction. being 
evident just behind the anterior region bearing the red pig- 
ment-spots. The posterior end is generally bulbous and pro- 
minent ; andin many a slightly elevated median ridge leading 
to the anus is evident. As the pedicle is often curved for- 
ward or projected outward at a small angle to the body, the 
ventral surface is comparatively short; indeed, in those which 
are much bent the base of the pedicle touches the buccal 
disk. ‘This contour of the body is interesting in relation to 
the oblique direction of the cup-like body of Lowxosoma. 
When the pedicle is extended the ventral surface is nearly 
straight and continuous with the pedicle, which leaves the 
body at the ventral edge, while the kidney-shaped mass of 
the body projects dorsally. The pedicle is shorter than the 
body, nearly cylindrical, and terminates apparently in a 
rounded end; it is marked ventrally by various longitudinal 
striz from the muscular bands. 
The anterior region of the body curves somewhat suddenly 
downward and backward, and forms a flattened surface on 
which the great buccal disk rests. On the ventral surface are 
two large and conspicuous pigment-spots or eyes, which are 
placed a little in front of the anterior margin of the oral 
