21 
perceptible. Nerves for the foot are given off from the pedal 
commissures just before their entering the ventral bloodsinus (fig. 
44,n!,n?). In the posterior bodyregion I find the number of nerves 
that take their origin from the ventral commissure and are direct- 
ed towards the foot-gland ete., increased. 
Strong transverse stems, giving off smaller branches in different 
directions are given off from the lateral nerves at regular distan- 
ces, running dorsally: it will afterwards have to be enquired into 
whether possibly some of these unite the two lateral nerves across 
the dorsum of the animal. I could not make out with certainty 
whether the lateral nerves unite in the posterior extremity of the 
body as they do in the other Amphineura. I find a ganglioniec 
swelling towards the end of each lateral nerve on each side of 
the rectum and from each of these ganglia a nerve branch takes 
its course dorsally. but whether these branches unite above the 
rectum could, owing to the injured state of the specimen, not be 
made out with certainty, however probable it may appear. In 
Chaetoderma and Chiton it has been noticed by different observers, 
in Neomenia v. GRAFF speaks of a distinet branchial ganglion above 
the rectum formed by the coalescence of the lateral nerves. 
These are the outlines of the nervous system, we must now 
enter upon a few details. 
From the cerebral ganglion which is broader than it is either 
long or high and which is unilobate, although a faint indieation of 
duplieity is just visible (fig 41) a great number of nerves take 
their origin, as TULLBERE's figure indicates for Neomenia Among 
these nerves are those that go towards the lips and mouth and 
numerous smaller branches which traverse the connective tissue in the 
head. Whether there is a buccal commissure amongst these cannot 
however be made out with certainty from my two, specimens. In 
the cerebral ganglion the great mass of nerve-cells occurs near the 
eircumference (fig. 41), the centre being essentially fibrous: the 
same was noticed in the other ganglia. A very delicate sheath of 
connective tissue with distinet nuclei (fig. 43, 44 s) surrounds both 
the nerve-centres and the longitudinal nerve-stems. The innervation 
