DESCRIPTION OF FIGURES. 297 



thickness. No measurements are given in the text. These can be 

 easily deduced from the plot. 



Compare the enlarged plot on fig. 4, the isolated reconstruction of 

 the acustico-lateral system on fig. 5 and the diagrammatic cross- 

 sections, figs. 8 to 12. 



Plate III. 



Figtire 4. — An enlarged projection of a portion of the same speci- 

 men as figured on the preceding plate, showing the proximal courses 

 of the nerves, X 47. The same color scheme as in fig. 3. The trans- 

 verse parallel lines across the roots of the nerves indicate the points 

 where they leave the medulla oblongata. The ganglia are drawn 

 with lighter shades of the same colors as used for their nerves. 



Plate IV. 



Figure 5. The acustico-lateral system of nerves, sense organs 

 and canals, as seen from the left (apparently right) side, X 23. 

 Based upon fig. 3, q. v. The outlines of the nose, eye and mem- 

 branous ear are indicated and colored a neutral tint, the outline of 

 the nasal organ being heavier in the sensory portion of the nasal sac. 

 The canals and sense organs are colored in accordance with their 

 innervation; thus, the r. lateralis vagi, green; the r. supra-tempo- 

 ralis vagi, olive green; the auditory nerve, grey; the r. mandibularis 

 externus VII and the r. opercularis superficialis VII, yellow; the r. 

 buccalis, red ; the r. oticus, red-brown ; the r. ophthalmicus super- 

 ficialis VII, chocolate brown. In the canals are indicated the limits 

 of the cranial bones to which the canals are related. All details are 

 drawn from a single specimen, except the organs 0. i, 0. 2 and 

 tnan. c. , supplied from other specimens on account of defects in the 

 sections used for the plot. 



Plate V. 



Figure 6. — The lateral lines of Lophius piscatorius, 12 cm. long, 

 natural size, seen from above. Adapted from Guitel, 'gi, p 139. 

 The several lines have been colored in accordance with their inner- 

 vation, the same colors being used as in the figure of the acustico- 

 lateral system of Menidia (fig. 5), which see. See also the text, 

 Section 2, III. fi. a. p., the posterior nasal aperture. The other 

 reference letters refer to the lateral lines ; see the text. 



Figure 7. — A reconstruction of the first spinal nerve, projected 

 upon the sagittal plane, X 66. This complex includes the occipito- 

 spinal nerves b and c of Fiirbringer. The sensor}^ component is col- 

 ored yellow, the motor blue — dark blue in the case of nerves arising 

 from the root c, and light blue from the root b. 



