296 NERVE COMPONENTS OF BONY FISHES. 



V-VII. I. and V-VII. 2. — anastomoses between the r. mandibu- 

 laris V and the r. mandibularis VII. 



XI. — branch of the vagus to the m. trapezius (n. accessorius). 



1. I. a. e. to 4. I. a. e. — branches of the IX nerve and of the first 

 three branchial trunks of the vagus for the four levator arcus branchii 

 externus muscles. 



/. /. a. i. — branch of IX n. for first m. levator arcus branchii 

 internus. 



2. I. a. z. — branch of second branchial trunk of vagus for second m, 

 levator arcus branchii internus. 



4. I. b. e. — the fourth levator arcus branchii externus musfcle. 



Plate I. 



Figure i. — Transection through the body of Menidia just in front 

 of the first spinal nerve (685, cf. fig. 3), X28. Drawn by Mr. F. W. J. 

 Veenfliet from a Weigert preparation, after fixation in Flemming's 

 fluid. 



Figure 2. — Transection similar to the last at the origin of the hyo- 

 mandibular and palatine nerves (514), X28. The section is slightly 

 oblique and the skin is defective on the dorsal surface. 



Plate II. 



Figure J. — The cranial and first spinal nerves of Menidia gracilis, 

 reconstructed from serial sections and projected upon the sagittal 

 plane, X 23. The entire plot was constructed from the left side of a 

 single specimen. No details were introduced from other specimens, 

 though almost every point was controlled on the opposite side of this 

 specimen and on other series of sections. The plot is drawn as if 

 seen from the right side, the drawing having been reversed during 

 the process of reconstruction. The correct relations would be given 

 by the mirror-image of the plate as printed. 



The outlines of the brain, eye and mouth cavity are given in black 

 lines, the outlines of the lateral line canals in green lines. The sym- 

 pathetic nervous system behind the trigeminus is omitted, also the 

 motor component of the vagus, the general cutaneous component of 

 the r. oticus and numerous details of the proximal portions of the 

 cranial nerves. Compare the enlarged plot of this region, fig, 4. 



All lateral line organs contained in canals are drawn as brown 

 rings, all naked lateral line organs, "pit-line" organs, etc., as brown 

 discs. Taste buds of the mouth cavity and lips are not drawn in. 

 All sense organs of the outer skin supposed to belong to the commu- 

 nis system are drawn as red discs. The organs of the lateral lines 

 are referred to in the text by number, counting in each line from be- 

 fore backwards. The scales at the top and bottom of the plate indi- 

 cate the serial numbers of the sections. The latter were 15 micra in 



