252 Journal of Comparative Neurology. 



third root and perhaps partially from the second root of the 

 vagus. They form a pre-trematic nerve to the third branchial 

 arch, pharyngeal twigs, r. intestinalis, and a r. post-trematicus 

 which is represented in part by a distinct nerve to the distal 

 end of the fourth brancial arch and in part by the r. recurrens 

 vagi. The motor fibers of the t. visceralis come from the fourth 

 root and probably from the third root also. They innervate 

 the m. cucullaris, m. dorso-trachealis, fourth levator arcus, the 

 intrinsic muscles of the glottis, and the m. interbranchiales. 

 The r, supra-temporalis is a purely lateral line nerve which 

 innervates sense organs over the posterior portion of the ear 

 capsule. The r. auricularis vagi is both lateralis and general 

 cutaneous. The lateralis fibers innervate organs located later- 

 ally and posteriorly of the territory of the r. supra-temporalis. 

 The remainder of the lateralis component of the vagus forms 

 the r. lateralis superior and r. lateralis inferior which innervate 

 the lateral line organs of the trunk. 



The first spinal nerve sometimes has a small ganglion. The 

 second always has a large dorsal root and ganglion. The ven- 

 tral rami of these two nerves fuse to innervate the m. genio- 

 hyoid and sterno-hyoid. The first nerve innervates the m. 

 basi-scapularis ; the second, the m. thoraci-scapularis. The 

 ventral r. of the second carries out, also, a large cutaneous 

 component which is distributed to the skin of the pectoral re- 

 gion. A general cutaneous nerve of the second spinal passes 

 laterad through the musculature to the skin near the base of 

 the third external gill and of the dorsal surface of this gill. It 

 anastomoses with a branch of the second truncus branchiahs 

 vagi. 



