CRANIAL NERVES OF SIREN LACERTINA 329 
Nervus glossopharyngeus (Urodela)? 
Radix lineae lateralis (supratemporalis), cum radice lineae lateralis X 
Radix motor 
Radix communis (fasciculus communis) 
Ganglion glossopharyngeum (ganglion petrosum?) 
Ganglion lineae lateralis (supratemporale) 
Rami: 
la. Ramus posttrematicus 
1b. Ramus pretrematicus Nervus branchialis primus 
lc. Ramus pharyngeus (anastomosis Jacobsoni) 
2. Ramus communicans cum faciali (portio communis) 
3. Ramus supratemporalis 
Nervus vagus (Urodela) 
Radix lineae lateralis 
Radix spinalis 
Radix communis (fasciculus communis) 
Radix motor 
Radix accessorius (motor) 
Ganglion vagi: 
Portio lineae lateralis 
Portio communis (ganglion nodosum?) 
Portio spinalis (ganglion jugulare?) 
Rami: 
1. Ramus communicans cum faciali (portio cutaneus) 
2a. Ramus posttrematicus X. 1 
2b. Ramus pretrematicus X. 1 Nervus branchialis secundus 
2c. Ramus pharyngeus X: 1 
2Since the manuscript of this paper was sent to the publishers there has 
appeared a paper by Landacve and McLellan: ‘‘The cerebral ganglia of the 
embryo of Rana pipiens’? (Jour. Comp. Neur., vol. 22, no. 5, 1912), in which 
it is shown that the ganglion of the ramus supratemporalis X should be classed 
with the glossopharyngeal rather than with the vagus nerve. This is in full 
agreement with the adult condition in Siren. Preparations of the embryo of 
Amblystoma tigrinum in the possession of the writer show beyond question 
that the ramus supratemporalis and its ganglion belong with the ninth nerve, 
the ganglion being widely separated in early stages from all other lateral line 
ganglia and closely joined to the glossopharyngeal ganglion. It is also worthy 
of notice that in Amblystoma embryos there is a distinct lateral line ganglion 
of the ramus auricula”is X. 
It is clear that the schematic analysis of the IX-Xth complex given above 
is very incomplete as far as the ganglia are concerned. Careful investigation 
of conditions in urodele embryos will doubtless dispel much of this uncertainty. 
