1909] Trachael Supply, Nervous System Corydalis 51 



cephalic connectives was more often nearly symmetrical and in a 

 number of specimens there was an additional median supplying 

 branch to the ventral region of the ganglion. This median sup- 

 plying branch ran under the ventral side of the ganglion, or a 

 little distance caudad of it on the connectives. It was found to 

 be fully as large as one of the branches of the lateral supply. In 

 about half of the specimens this branch was found and was appar- 

 ently torn off in one or two of the other specimens. This un- 

 paired branch divides into three a little below the ganglion, the 

 two lateral tracheae run up to the base of the ganglion, one on the 

 dorsal side, one on the ventral side and each breaks up into num- 

 erous tracheoles about the base of the ganglion near the middle 

 line. The median branch runs also in a cephalic direction for a 

 short distance and then divides into two and these again into 

 two main parts on each side, the more cephalic portion bends out 

 and after breaking into a number of smaller tracheae, supplies 

 the more caudal and lateral parts of the ganglion, while the more 

 caudal portion bends back with few twigs to supply the connective. 



(Fig. 4.) 



The various larger branches mentioned in connection with 

 this ganglion each give off an intimate supply of fine tracheoles, 

 both superficial and deep and although a certain area has more 

 tracheoles from a particular trunk, there are also numerous 

 tracheoles winding in all directions from other systems. The area 

 within the ganglion which receives the best supply of fine trach- 

 eoles is the central part on each side. The median line is rather 

 clear because there are few branches in this region, although a 

 number of the tracheoles from both sides cross this area in every 

 direction. (Fig. 4.) 



SECOND THORACIC. 



In a similar way to the first ganglion a branch on each side 

 enters from the transverse abdominal tracheal trunk. These two 

 branches run down laterally and to the ventral and slightly 

 cephalic region of the ganglion. 



On each side the supplying trunk divides into three main 

 portions. A cephalic, consisting of a single long branch to the 

 outer side of the connective and a small tracheole from this which 

 runs more medially on the cephalic connectives. A median part 

 which breaks up into about five branches to supply the central 

 and cephalic part of the ganglion and a caudal branch. This 

 caudal portion is much smaller on the left side and furnishes small 



