1908] Nervous System of the Larva of Corydalis iir 



The labial nerve (Figs. 5 and 7, i). The labial nerve 

 arises slightly ventrad of the maxillary nerve. It runs forward 

 into the labium, where it gives olf several branches. The first 

 of these has three sub-branches, of which the proximal one pro- 

 jects mesad and innervates the ventral muscles of the labium; 

 the second terminates in numerous branches near the lateral base 

 of the labium; and the third projects to the latero-distal portions 

 of the submentum. 



Branch 2* arises cephalad of branch i, and runs mesad of 

 the main nerve. Its termination has not been located definitely. 

 Branch 7 innervates the lateral portions between the submentum 

 and the mentum. Branch 4 supplies the distal border of the 

 labium and branch 5 enters the labial palpus. 



The gustatory nerves (Fig. 5, gn) . Projecting cephalad 

 from the anterior border of the suboesophageal ganglion are twO' 

 thread-like nerves which have been called by Krauss '84 the 

 gustatory nerves. They innervate the regions surrounding the 

 opening of the salivary glands. 



The salivary nerves (Figs. 2, and 5, sn). The salivary 

 nerves consist of two long thread-like nerves, arising shortly 

 cephalad of the connectives from the caudo-lateral border of the 

 ganglion. They project caudad, parallel to the connectives and 

 enter the pr ©thoracic cavity, where they turn laterad, branching 

 off near the sides of the prothorax. 



It is interesting to note that up to the present time the salivary 

 glands of Corydalis have not been described. It was first through 

 the tracing of the nerves and the determining of their homologies 

 that I was lead to recognize the salivary duct, the so-called 

 "unknown nerves" of Krauss '84. 



The ventral nerve of the suboesophageal ganglion (Fig. 

 5, iv). Slightly caudad of the maxillary nerves there arise from 

 either side of the ganglion a small much branched nerve, which 

 innervates the regions below this ganglion. There is also a short 

 branch given off to the salivary ducts. 



The median nerve (Fig. 5, m. n). The median nerve arising 

 from the suboesophageal ganglion will be described under the 

 sympathetic system. 



* Krauss, '8i, figures this branch as innervating tlie sahvary duct. (Fig„ 

 11, 7). 



