— 59 — 
think the latter supposition to be the right one. — The relation of this 
fibrillar substance to the ganglion cells, and to the peripheric nerves, 
as also the origin of the nerve-tubes, Vejdovsky defines very 
indistinctly, and I have not, indeed, succeeded in getting any clear 
idea of his real opinion. Once he says that in Bendrohæna he has 
observed the processes of the ganglion cells penetrate into the 
fibrillar substance where they subdivide »wiederholteniTialen in die 
feinsten Fortsatze, um ein merkwiirdiges Fibrillennetz zu bewerk- 
stelligen« (1. c. p. 90). »Diese Fibrillen sind jedoch ganz anderer 
Art als die jenigen, welche in der Langsaxe des Bauchstranges ver- 
laufen. Sie steilen namlich keine selbståndigen Elemente vor, sondern 
entspringen aus den Ganglienzellen in denen bereits altere Forscher 
eine fibrillåre Anordnung der Plasmaelemente sichergestellt haben.« 
How this ought to be understood, and what the importance of 
»diese Fibrillen« is, in Vejdovskys opinion, I certainly can not tell.') 
Afterwards he tells us, that in other species of OUgocliætes and 
especially in the larger ones, he has observed the ganglion cells 
send their processes directly into the fibrillar substance to form 
»quer und schråg verlaufende Fibrillenbundel«. The relation of these 
>Fibrillenbundel« to the nerves he does not mention, neither does he 
say anything of the origin of the nerves, so far as I have seen; he 
only tells us a little of the views of previous writers, especially Will, 
Walter and Waldeyer, and it really looks as if he agrees with these 
old authors. 
SCHIMKEWITSCH, in his paper on »ranatomie de répeire^< (1884), 
has suplied no important adition to the knowledge of our present 
subject. Like Viallanes, he refers to descriptions, by other authors, 
of the structure of the » substance ponctuée« the significance of 
which he states to be very difficult to understand. He supposes 
the peripheric nervefibres to originate in this substance, and, thus, 
he does not believe in a direct origin of the fibres in ganglion cells. 
Remy Saint-Loup, in his paper on »l'organisation des Hirudi- 
nées« (1885), agrees with Vignal regarding the histology of the 
nervous system and has therefore not tåken up this subject for his 
own investigations. 
P. 92 he says that of these fibrillæ »sich offenbar nur ein Theil an der 
Bildung der queren und schriigen Fibrillenbiindel betheiligen. Die iibrigen feiaen 
Fibrillen schlangeln sich zvvischen der fibrillåren Substanz und diirften wohl zur 
Entstehung besonderer Hohlriiume wesentlich beitragen.» These »Hohlraume« which 
he describes as «meist kreisformige, farblose, undeutlich contourirte Feldchen« are 
evidently nothing but transsected nerve-tubes. 
