Literary Notices. xliii 
1. The commissura inferior of GUDDEN, or Commissura arcuata 
posterior of HANNOVER.. GUDDEN termed this the com. inferior in 
transverse sections, but the com. superior MEYNERTI in horizontal sec- 
tions. Its fibers are closest to the chiasma at their crossing and go out 
laterally closely associated with the optic tracts. 
2. The rostral part of the decussatio subthalamica anterior of 
GANSER. This is GUDDEN’s commissure of MEYNERT, and it may 
properly retain the name, MEYNERT’S commissure. Its crossing lies dor- 
sally of the com. inferior, and its fibers also go out with the optic tracts 
laterally. 
3. The caudal part of the decussatio subthalamica of GANSER. 
This may retain the name GANSER’s commissure. Its fibers after the 
crossing run back on each side of the body nearer the median line than 
either of the others and they envelop the fornix tracts laterally of the 
third ventricle. 
The contradictory accounts of earlier authors are carefully re- 
viewed in the light of the author’s experimental results and it is to be 
hoped that the conclusions reached may set at rest the synonomy of 
this confusing region. It is needless to add that a real understanding 
of these commissures (or decussations, as they probably are) cannot be 
hoped for until we know the exact terminal relations of all the types of 
neurones involved. 
There is described a curious mesial slip of the optic tract which 
runs up along the inner side of the inferior commissural tract. ‘There 
is, the reviewer may add, an exactly similar detached portion of the 
optic tract in the bony fishes, which terminates in the nucleus geni- 
culatus externus. Cae he 
Peripheral Nerve Endings in Amphioxus.'’ 
The description of the course and distribution of the sensory and 
motor nerves confirms in general the results of HEyYMANS and VAN DER 
STtRIcHT. The most important part of the paper deals with the periph- 
eral endings of the sensory nerves. ‘Two sets of fibers are distin- 
guished. The first pass through the homogeneous Hautschicht by 
means of special canals and reach a position immediately beneath the 
epithelial cells. Here they branch and form a subepithelial plexus 
from which ‘‘eine Menge feinster varicéser _Fadchen” pass up and end 
between the epithelial cells, The second set of fibers have their cells 
' Das periphere Nervensystem des Amphioxus (Branchiostoma lanceola- 
tum). Von A. S. DocteL, St. Petersburg. Axat. Heften, Eletitele xevalenn pie 
147-213, Pl. XII-XXIX. 1902. 
