5/6 'Journal of Comparative Neurology and Psychology. 



internus of P. Furbringer. The dorsal branch of the visceral 

 ramus of the IX nerve now appears in the dorsal wall of the water 

 tube. A small bundle destined to the oesophagus is marked o.b. 

 in the figure. 



In figs. 7 and 8 the final branches of the maxillo-mandibular 

 complex are shown. Large cutaneous branches go forward in 

 addition to those mentioned above. A large number of fibers pass 

 laterad beneath the orbit and form a rich plexus in the connective 

 tissue covering the infra-orbital prolongation of the parietal muscle 

 and forming the ventro-lateral wall of the orbit. From this plexus 

 arise the fibers to the cornea and small nerves into the skin before 

 and behind the eye. Several bundles, one of which was noted 

 in fig. 6 as the posterior lateral branch, pass laterad behind the 

 orbit, cross the spinal ventral nerves i and 2, pierce the parietal 

 muscles and diverge to the skin beneath and behind the orbit. 

 The velar nerve reaches its destination in these sections, entering 

 the velum and innervating the epithelial covering of the velum 

 and its tentacles. The VII nerve divides in fig. 7 into cutaneous 

 and visceral rami. The visceral ramus gives off branches which 

 supply the whole lining of the anterior half of the first gill sac 

 with its gill lamellae. Other branches supply the muscle sheath 

 of this gill sac. The cutaneous ramus goes downward and forward, 

 passes beneath the cutaneous rami of the trigeminus just described, 

 and passes out to the skin below the orbit in several bundles (figs. 

 8a and 9). In figs. 7 and 8 the visceral ramus of the IX nerve 

 reaches the wall of the water tube and joins with its dorsal branch 

 mentioned above. It has also a ventral branch, not shown in this 

 series of figures, which supplies the floor of the water tube (fig. 18). 

 The visceral rami of the several divisions of the X nerve behave 

 in a similar manner. 



In fig. 9 the motor ramus of V divides into a smaller anterior 

 branch to the protractor muscles of the "tongue" and a larger 

 posterior branch to the circular and retractor (fig. 10) muscles 

 of the same organ. The continuation of the visceral ramus of the 

 VII nerve has meantime divided into two branches. The anterior 

 of these consists of relatively coarse fibers seen in fig. 9 just lateral 

 to the tongue muscle nerve. This supplies the m. hyo-hyoidens 

 anterior (see below). The posterior branch of the visceral ramus 

 gives off fibers to the lining and muscle of the first gill sac, then 

 (figs. 10 and 11) descends beneath this sac, runs meso-caudad and 



