The adult organisation of Paragordius varius. 497 
nervous system, according to VEJDOVSKY, is represented by nerve 
branches of the peripharyngeal ganglion and by the neural lamella. 
In a second paper (1888) he gives a fuller account of the transverse 
commissures of the “Bauchstrang”, and finds that the neural lamella 
is not a continuous structure but consists of a series of “Nervenstiele”, 
each inclosing a nerve fibre from a ganglion cell placed in the “Bauch- 
strang”. Then he describes the “Fasersubstanz”, concluding that it 
represents a “neurales Reticulum” or “Nervennetz” formed by the 
fusion of the chromatin networks of embryonic cells; in this remarkable 
interpretation VEJDOVSKY is influenced by the results of his studies 
on the embryology of Oligochaeta. In his third paper (1894) 
VEJDOVSKŸ shows that there is no cerebral ganglion and no ganglion 
cells on the dorsal side of the peripharyngeal ganglion, in correction 
of his earlier conclusion. He distinguishes also a “Stiitzgewebe” or 
“Glia”, which is possibly comparable to my ‘‘chromophilic nerve cells”, 
and the immediate parenchymatous envelope of the “Bauchstrang” he 
terms a neurilemma; there is only one true ganglion cell to be seen 
on a given cross section, the others cells are “Gliazellen”. The 
“Nervenstiele” he now terms “Seitennerven”, and finds them to be 
unpaired: “die so durch die Doppelhiillen und die Ganglienzellenfort- 
sätze ausgezeichneten Nerven treten direct in die Hypodermis ein, um 
sich hier zu einem Längsstrang zu verbinden und einen mächtigen 
Hypodermisnerven zu bilden” (my longitudinal hypodermal nerve); he 
did not find lateral branches of this nerve. He concludes that “der 
Bauchstrang der Gordiiden nur einer Hälfte des Annulaten-Bauch- 
strangs entspricht. . . . Es ist aber den künftigen Untersuchungen vor- 
behalten, zu entscheiden, ob der ganze Bauchstrang von Gordius nur 
einem Ganglion oder der ganzen Ganglienkette der Annulaten und 
Arthropoden entspricht. Die derzeit festgestellten Thatsachen scheinen 
eher zu Gunsten der erstern Ansicht zu sprechen”. VEJDOVSKY has 
given detailed observations on the nervous system, but be has everywhere 
emphasized the similarities to the Annelida, and not sufficiently weighed 
the differences. 
CAMERANO (1897b) states: “Il sistema nervoso consta di due 
masse gangliari sopraesofagee: da due cordoni nervosi che partono da 
esse, circondano l’esofago e si riuniscono lungo la linea ventrale 
mediana in un cordone unico rivestito di cellule gangliari.” 
RouwpE (1892) finds a “fasriges Stiitzgewebe” between the ganglion 
cells and penetrating into the “Punktsubstanz”, the radial fibres of 
which are mainly from such cells. Does not find VEspovsKY’s seg- 
