4S The Ohio Journal of Science [Vol. XVII, No. 2, 



Plate IV. 



Figure 18 is an outline of the section of which a portion is detailed in Fig. 17. 

 This section is three or four sections posterior to the anterior end of the profundus. 

 Sec. 45. X 27. 



Figure 19 is a detailed drawing of the profundus at the level of Figure 20. 

 The ventro-lateral attachment of the profundus to the lateral ectoderm is shown. 

 The loose structure of the ganglion and its irregular outline are also shown. Sec. 

 5G. X 175. 



Figure 20 is an outline of the section of which a portion is detailed in Fig. 19. 

 Sec. 56. X 27. 



Figure 21 shows in detail the extreme posterior end of the profundus ganglion 

 slightly anterior to the level of the evagination of the optic stalks. The ganglion 

 appears very small in this figure. Large yolk granules appear as light areas in 

 the surrounding mesenchyme. (See Fig. 22). Sec. 67. X 175. 



Figure 22 is an outline of the section of which a portion is shown in detail in 

 Fig. 21. Sec. 67. X 27. 



Figure 23 shows in detail the extreme anterior end of the Gasserion ganglion 

 which appears as a small, darkly stippled mass. The level is that of Fig. 24. 

 The anterior end of a placode is shown (PI). Sec. 76 . X 175. 



Figure 24 is an outline of the section of which a portion is shown in detail in 

 Fig. 23. Sec. 76. X 27. 



Figure 25 shows in detail the characteristic condition of the Gasserian gang- 

 lion near its middle part. The relation to the medulla is shown. No root, either 

 cellular or fibrous, appears. Sec. 85. X 175. 



Figure 26 is an outline of the section of which a portion is detailed in Fig. 25. 

 Sec. 85. X 27. 



Figure 27 shows in detail the posterior part of the Gasserian ganglion. It 

 lies in contact with the first visceral pouch (Ph. p. 1, Fig. 28) and near a placode 

 of the lateral line series (PI). X 175. 



Figure 28 is an outline of the section of which a portion is detailed in Fig. 27. 

 Sec. 94. X 27. 



