258 J. B. JOHNSTON, 
Pla tier ao: 
Phots. 54 and 55. Two consecutive horizontal sections through 
the base of the midbrain, section 55 being more ventral. Decussation 
of bundles of Mrynerr and commissura ansulata. Phot. 54, X 30; 
Phot. 55, X 45. 
Phot. 56. Sagittal section through caudal part of hypophysis, 
showing fibres supplied to saccus-tubes penetrating this part of hypo- 
physis. X 60. 
Phot. 57. Tectum. Cell of type D.. X 120. 
Phot. 58. Similar to Phot. 56. In both the cephalic border is 
toward the right. X 60. 
Phot. 59. Cell of lobus inferior. Dendrites with spines. X 120. 
Phot. 60. Cells of cephalic part of corpus mammillare. X 90. 
Phot. 61. Detail of fibre endings in saccus epithelium. 120. 
Phot. 62. Simillar to Phot. 56, but from a different brain, showing 
detail of endings. X 120. 
Phots. 65 and 64. Frontal sections through mid-ventral part of 
lobi inferiores. Described in the text as part of the corpus mammillare. 
X 60. (Phot. 60 is through the same region.) 
Phot. 65. Cell of lobus inferior, Neurite increases rapidly in 
thickness. X 120. 
Phot. 66. Fore brain. Cell of “cortex”. Lateral surface of brain to 
the left, neurite descending parallel with surface. X 120. 
Phot. 67. Right ganglion of habenula, frontal section. Fine and 
coarse fibres of the bundle of MeynerT in separate bundles. X 60. 
Plate 
Phot. 68 Left ganglion of habenula, frontal section. Cells of 
origin of bundle of Mrynerr. Section adjacent to that of Phot. 67. 
M2 0: 
Phots. 69 and 70. Cells of lobus inferior. Neurites with col- 
laterals. 120. 
Phot. 71. Fore brain. Cell probably belonging to nucleus post- 
olfactorius medialis, whose neurite runs for a considerable distance toward 
the olfactory lobe and then bends back on itself. X 120. 
Phot. 72. Lobus olfactorius. Cell of Caraz. X 86. 
Phot 73. Fore brain. Frontal section of mid-ventral region im- 
mediately in front of commissura anterior. Cells similar to those of the 
nucleus taeniae. XX 120. 
Phot. 74. Fore brain. Cells of nucleus postolfactorius dorsalis. 
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