SEA-FISHERIES LABORATORY. 893 



larger scale, although from the same series 

 of sections. The nerve ranmli in front are a 

 little diagrammatic, in order that they may 

 be shown more clearly. viii., auditory 

 nerve. The reconstruction applies also to 

 the adult ear, but the relative sizes of the 

 parts are of course different. 



Fig. 25. Reconstruction of the right and left nasal 

 •organs seen from above. Drawn to exactly 

 twice the scale of figs. 23 and 26, and from 

 the same series of sections. The disposition 

 of the accessory secretory chambers is 

 slightly diagrammatic for the sake of clear- 

 ness. The termination of the olfactory 

 nerves is not shown for the same reason. 



Fig. 26. The sympathetic nervous system seen from 

 above, and plotted from the same series of 

 sections and to the same scale as fig. 23. 

 The dotted line represents the median line 

 of the body continued straight forwards. 

 The figure is diagrammatic in four respects : 

 (1) the coeliac ganglion lies directly under 

 ganglion 2 ; (2) the first cranial ganglion 

 lies immediately over the second on the 

 ocular side ; (3) the ocular ciliary ganglion 

 lies over the third nerve ; (4) the eyeless 

 ciliary ganglion is external to the oculo- 

 motorius. The cranial ganglia are numbered 

 1-8, the spinal V-7'. iii. is the Nervus 

 oculomotorius, after it has given off the 

 nerve to the M. rectus superior. 



Plate IX. 



Fig. 27. Reconstruction from serial sections of the first 

 BE 



