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the neurofibrillae very much like that deseribed by Apatiy in the 
smaller ganglioncells of Lumbricus. The fibrillae however in Amphioxus 
ave thinner, and the reticulum finer. 
In other ganglioncells there are not two networks (one round the 
nucleus and one more at the periphery), connected with each other 
by means of the radial fibrillae, but the neurofibrillae enter the 
cell, form a network round the nucleus and leave the cell at the 
other side, without there being any trace of a more peripheral 
network to be seen. 
A connection between different ganglioncells by means of the 
neurofibrillae, I could not yet state with a sufficient amount of certainty. 
In the colossal ganglioncells the #Kolossalzellen”, lying just in the 
middle of the spinal cord, the arrangement of the neurofibrillae is 
very peculiar. From out the colossal nerve-fibres, the axons of these 
cells, a thick bundle of very thin neurofibrillae, arranged very regularly 
and equally in the whole axis cylinder, enter the ganglioncell; in 
the cell-body they pursue their way as a thick bundle that passes 
round the nucleus, turns upon itself, forms a sort of vortex and then 
seems to condense itself -into a few thick (composed of a great 
number of elementary fibrillae) fibrillae. Where these fibrils go to, 
I could not state accurately. In the axons the extremely thin neuro- 
fibrillae are closely set and parallel to each other, and so a striking 
resemblance is formed with the “sensorische Schläuche” of Hirudines 
and Astacus. During the course of these nerve-fibres through the 
spinal cord the neurofibrillae are seen to pass one by one every now 
and then in an oblique direction through the wall of these nerve- 
fibres; then they are lost in the nervous network without, and could 
not be followed any farther. Perhaps they are connected there with 
other ganglioncells, which should be in concordance with the character 
of the colossal ganglioncells as connecting cells (“Schaltzellen’’). 
(. The innervation of the striped muscular tissue. 
According to Ronpe *) the motor nerves simply enter the muscle- 
plates there where these end, and there is no trace of a motor nerve 
endplate; according to HEYMANS and vAN DER STRICHT*®) however the 
„motor nerves of Amphioxus terminate each in a shovelshaped end- 
plate, that lies itself against the muscle-plate just as the motor nerve 
endplates of the higher vertebrates do. According to their deserip- 
tions and drawings the endplates of Amphioxus are thick shovel- 
shaped plates without branchings, without further differentiations 
(Golgi method). 
1) Scunewer’s Zoologische Beiträge. Bd. Il, 1888. 
*) Mém. couronn. par l'Acad. roy. de Belgique 1898, 
