DESCRIPTION OF FIGURES. 289 



DESCRIPTION OF THE FIGURES. 



All of the figures of Menidia, viz., all except figs. 6, 14 and 15, are 

 based upon a single series of transections of Menidia gracilis. The 

 findings, however, were controlled by many other series prepared by 

 the same and other methods. The serial numbers of the sections are 

 indicated upon the scales above and below the plotted reconstructions 

 and all drawings of transections are given their appropriate serial 

 number. These serial section numbers are also used frequently 

 throughout the text as a convenient means of referring to positions 

 on the plots. The plots are accurately drawn to scale on the basis of 

 a series of camera lucida outlines of representative sections. 



Reference Letters. 



a. to t. — naked cutaneous sense organs about the nasal apertures. 

 a. c. — anterior semicircular canal. 



a. I. — anastomosing root of the r. lateralis vagi derived from the 

 n. IX. 



amp. ex. — external ampulla. 

 ^7??".— articular bone. 



a. r. VII., a. r. VII. i. and a. r. VII. 2. — anastomosing rami 

 from the vagus to the r. recurrens VII to form the r. lateralis acces- 

 sorius. 



b. c. and b. c. i. to b. c. j. — the five branchial clefts, 



br. g. X. — the ganglia of the four branchial rami of the vagus, 

 including the visceral ganglia. 



b. V. — blood vessel. 

 cb . — cerebellum. 



cb. cr. — cerebellar crest. 



cb. VIII. — cerebellar VIII, root fibres from VIII nerve to cere- 

 bellum of same side. 

 CBj. — the third ceratobranchial bone. 



c. d. — dorsal comu of spinal cord. 

 ciL b. — ramus ciliaris brevis. 



cil. g. — ciliary ganglion. 

 cil. I. — ramus ciliaris longus. 

 com. ac. M. — commissura accessoria Mauthneri. 

 com. inf. — commissura infima Halleri. 



com. IX. — communis (sensory) root of the glossophar3mgeus. 

 com. m.x. — the communis element for the r. maxillaris V. 

 com. oph. sup. — the communis element for the r. ophthalmicus 

 superficialis. 

 com. VII. — communis root of the facialis. 

 com. X. — communis root of the vagus. 



