182 



PSYCHE. 



[June— July 1SS4. 



oesophageal ganglion, and continue their 

 course ccphalad into the labium. At a 

 point one millimetre from the ganglion 

 two branches are given oft' laterad, one 

 from each nerve, which divide into sev- 

 eral small branches piercing the integu- 

 ment. 



At a point two millimetres from the 

 ganglion two branches are given ofi", 

 one from each nerve, going cephalo- 

 laterad to the integument. 



At a point three millimetres from the 

 ganglion the labial nerve separates into 

 two large branches, one extending to the 

 palpus, and one to the-distal end of the 

 ligula. The nerve of the labial palpus 

 enters that organ, and near its extrem- 

 ity separates into several small branch- 

 es. The ligular nerve continues cepha- 

 lad into the ligula, and near its extremity 

 divides into two or three small branches. 

 The nerve of the labial palpus gives off 

 a very small nerve at the point of enter- 

 ing the palpus. 



The gustatory nerves. — The gusta- 

 tory nerves (fig. 11. 2), if they may be 

 so called, arise from the ccphalad border 

 of the sub-oesophageal ganglion, and 

 continue their course ccphalad into the 

 ligula, being in close relation to the floor 

 of the mouth. At a point three milli- 

 metres from the ganglion, at the caudad 

 part of the ligula, the nerves meet 

 on the meson, forming an arch. The 

 dextral nerve sends a small nerve laterad 

 about one and one-half millimetres from 

 the ganglion, while the sinistral ner\e 

 sends a branch laterad one millimetre 

 from the ganglion. Tlic two nerves, at 

 the point of changing tiieir couise from 



cepiialad to mesad, give olV two branch- 

 es, one from each nerve. These 

 branchescontinuccephalo-laterad, pierc- 

 ing the floor of the mouth. These 

 branches also divide into several smaller 

 branches. The arch of the gustatory 

 nerves gives oft' two small nerves, going 

 ccphalad, which unite at a point one 

 millimetre from the arch. This united 

 nerve divides into three small nerves, 

 one going cephalad, and two going 

 cephalo-laterad. The gustatory nerves 

 and branches are very fine and delicate, 

 and are closely related to the integument 

 which forms the walls of the labium and 

 ligula. 



T/ic fnaxillary nerves. — The maxil- 

 lary nerves (fig. 11. 5 and fig. iii) arise 

 from the ventro-latero-cephalad borders 

 of the sub-oesophageal ganglion as a 

 single trunk, which immediately divides 

 into four branches. These may be in- 

 dicated by the letters a. b, c. d. fig. 11. 

 5, and A, B, c, fig. III. 



Nerve A (fig. lii), which is the 

 largest of the branches, forks at a point 

 about two millimetres from the gan- 

 glion. Both branches enter the max- 

 illa, going to its extremity, and one of 

 them enters the maxillary palpus. 



Nerve b. — This branch ilividcs into 

 two branches, three millimetres from 

 the ganglion, one branch forking im- 

 mcdiatelv and going ce])hal,ul. The 

 other branch continues laterad, di\ i(ling 

 into several branches which pierce the 

 integument. 



iVcrve c. — This branch forks two mil- 

 limetres from the ganglion, one branch 

 going cephahul to the maxilla, tlie nther 



