1881. ] Comparative Neurology. III 
the pneumogastric nerves and the lateral columns of the spinal 
cord of higher Vertebrata. Confer ganglionic swellings upon all 
_ these afferent spinal nerves of the Amphioxus, proportioning their 
sizes to the nerve bundle sizes, and an appearance is presented 
like that which obtains in Zrigla adriatica, a series of dorsal 
(intervertebral) ganglia from tail to head forming intervertebral 
ganglia, cerebellum, optic lobe (so-called cerebrum), and the 
higher series differ from the lower only in point of mass. 
The crura cerebri and tegmental fibers thus become efferent 
and afferent nerves from the higher homologues of the central 
tubular gray; the corpora striata and optic thalamus, and these 
fibers with part of the restiform column project at different levels 
trom and to the spinal gray as peripheries along the antero and 
postero-lateral columns of the cord. But this does not comprise 
all of the projection series from these parts for the cerebro-spinal 
nerves have their primary projections as well. 
Morphology of the Third System Lobes—The position of the 
cerebellum and its recognizable phylogenetic changes may be 
easily traced through the Vertebrata generally, but the lobes 
Superior to it undergo a variety of distortions and changes of posi- 
tion, for the solution of which we must resort to schematic views. 
Given, a series of tubercles which shall from behind forward 
represent the lobes of the brain, as follows: 
Posterior pair of tubercula quadrigemina. 
Anterior pair of tubercula quadrigemina. 
. Epiphisis cerebri. 
Mammillary eminence. 
Olfactory lobe. 
Cerebrum. 
onl 
. 
Oy f woh 
The gray secondary of each being united by commissures, the 
afferent and efferent. The first of these commissures it will be 
most convenient to follow through the developmental gyrations 
as apparently connecting the under surface of each lobe, but in 
reality connecting the secondary segments pertaining to each, as 
optic thalamus, tuber cinereum, olfactory ganglion and corpus 
striatum. 
