ORIGIN OF JAW APPARATUS 393 
quently ventrad of the ophthalmicus lateralis on the side of the 
snout. It will take more study and different methods from any 
yet applied to differentiate the elements entering the nerve veil of 
the snout so that they may be followed back to the parent roots. 
Having briefly described the origin and interconnections of 
the roots of tle jaw nerves and their course to the periphery, 
it is in order to explain how they intercommunicate and are tied 
together at the periphery. This anastomosing of peripheral 
branches of the main nerve pathways is apparently for the pur- 
pose of shunting impulses by several paths toward the brain 
-centers and permitting a diversified radiation of motor and other 
impulses toward the periphery for one or several choices out of 
the many possible combinations of peripheral reactions. This 
veil is worthy of physiological study. Since time after time new 
dissections have disclosed additional interconnections, I am far 
from saying that the following account is complete. I present 
these results of my dissections to serve as a basis of further study. 
A general view of the peripheral relations may be given in few 
words. The snout region of Bdellostoma in and under the 
skin is veiled over by a wide-meshed network of anastomosing 
branches of the nerves of the jaw apparatus (figs. 34, 35, 36). 
This net is located in the skin and between the skin and outer 
muscles of the head. It is most highly developed in the region 
between the eye and the tentacles. It is connected with numerous 
anastomoses, penetrating all parts of the snout, forming here 
and there special net coverings, e.g., the network about the 
anterior section of the velo-quadratus. 
The nerves contributing branches to the network associated 
closely with the eye and nose complex are: 
. Nasalis 
. Ophthalmicus profundus 
. Ophthalmicus lateralis 
. Acusticus a 
. Acusticus b 
. Mandibularis 
. Maxillary group 
. Facial 
Noe 
CoN Or Ww 
