110 Reviews and Records in Anatomy and Physiology. 
The central portion is divided into two parts, one at the ce- 
phalic, the other at the caudal extremity of the body. In the 
rst, are two anterior and two posterior cephalic ganglia, and an 
cesophageal ring composed of a superior and an inferior ganglian 
‘united by lateral commissures. In the second part, situated in 
the tail, there are three fusiform ganglia, of like character but 
smaller than those of the head. i 
The peripheric portion consists of six filaments given off from 
the upper part of the anterior cephalic ganglia which go to as 
many papillz on the head and probably organs of sense,—of two 
lateral cords arising from the superior cesophageal ganglion, which 
traverse the sides of the body, giving off filaments to the mus- 
cles, the skin, é&c., and of some smaller twigs from the cephalie 
centres for the muscles of that region. 3 
. e splanchnic portion consists of two lateral trunks arising 
from the cesophageal ganglion, which soon meet and unite on the 
median line of the body, forming one cord which extends to the 
tail. From this cord are given off filaments to the organs of 
vegetative and reproductive life. i: 
The three cords thus formed, having traversed the body, end 
each in one of the three ganglia above described. e can here 
allude to only one more point in the disposition of the nervous 
system; this is the final termination of the nerve-filament 1% 
muscle. According to our author, a twig enters the muse 
fibre at right angles to the course of the latter, and upon its e0- 
trance divides into two twiglets, one of which runs with the fibre 
one way and the other the opposite, and is lost in the muscular 
tissue.* 
The histology of this system in so minute animals as, thes? 
worked out by an observer so expert and faithful as Meissueh 
presents many note-worthy points. ive 
The ganglia in question are composed exclusively of gangliou 
cells or globules which appear to be the infundibuliform expat 
sion of as many nerve fibres that compose the nervous cord col- 
necting these ganglia with the general system. There are none 
of the so-called nerve-cells usually found in nervous centres— 
fact these central masses rather resemble true ganglionic forma- 
tions, excepting that they are terminal instead of on the course of 
a nervous cord. The description and figures, especially the latter, 
of Meissner are so good, as to leave no doubt that there is here A 
direct continuity of the nerve-fibre with the ganglionic vesicle, 
In a former reviewt we alluded to some discrepancy on 'P 
point, and as this continuity had been observed by some, and yet 
* Mei 
Hats ae? Fe ba ap cosinor ng 
843, xix, p. 300) in idina, some eli Rotate. 
ssner observes, a similar disposition is mentioned by Doyére (Ann. d. St 
46) i : ¢ Tardigrada, and by Quatrefages (ibit 
Sept. No, 1855, p.253. | wore 
