ORIGIN OF JAW APPARATUS 389 
ae 
Fig. 35 A. Dorsal view of a dissection of some of the snout nerves of Bdellos- 
toma. Forward extensions of the two trunks of the ophthalmic and the maxillary 
nerves are shown. The branches of the latter to the second tentacle and the 
skin between it and the first tentacle are drawn in more detail to show the tuft- 
like terminals. At A is shown an anastomoses between ophthalmic and maxillary 
nerves in the form of a large bundle of fibers. Near by is seen an exchange of 
fibers in the form of a small bundle between the two branches of the ophthalmic. 
B. Figure to illustrate the connection of the subdermal nerve net with deeper- 
lying structures. Nerve branches descend through the muscle and rise from nerve 
net and nerve trunks through the muscle to the surface. The arrangement re- 
calls the association of parts found in the plexiform innervation of the jaw 
apparatus of Amphioxus. 
