Houser, Zhe Neurones of a Selachian. 175 
Fig. 57. Neurone from the roof-nucleus of midbrain, right sidz, together 
with a part of the stratum medullare profundum. Two fibres are seen to emerge 
from the stratum to end in arborizations near the neurone. Iron haematoxylin 
staining. Outline x 496; details from the homogeneous immersion. 
PLATE XIII. 
Fig. 58. Midbrain. Sagittal section through the nuclei of the oculomotor 
and trochlear nerves. Methylen-blue, x 89. 
Fig. 59. Neurone from the nucleus of the III nerve. The tigroid masses 
in the region of the nuclear membrane are remarkable for their large size. The 
NIssL method, X goo. 
Fig. 60. Neurone from the nucleus of the IV nerve. The Nissi method, 
120: 
Fig. 61. Ependyma from the optic lobes. The ependymal fibres are rep- 
resented to the boundary of the central gray matter, only; see Fig. 21 for the 
entire fibre. Combination of iron haematoxylin and methylen-blue staining, 
X 1120. 
Fig. 62. Interbrain. Two neurones from the nucleus strati grisei of the 
thalamus. The Niss~ method, x I120. 
Fig. 63. A characteristic group of neurones from the nucleus geniculatus 
of the thalamus. The Niss~t method, * II20. 
Fig. 6g. Twoneurones from the left lobus inferior. Their dendrites are 
directed toward the limitans externa. The Niss_ method, X 1120. 
Fig. 65. Y¥orebrain. A group of three neurones from the epistriatum. 
The NIss_ method, X 1120. 
Fig. 66. A neurone of the general striatum. The Niss_ method, X 1120. 
Fig. 67. A group of five neurones from the nucleus postolfactorius. The 
NISSL method, 1120. 
Fig. 68. Neurones from the left pallial eminence. The neurone of the 
tractus pallii (f. ¢. %.) shows an axone-hillock. The smaller neurone (as. m.) is 
of the associative type. The Niss_ method, x 1120. 
Fig. 69. CAJAL neurone from the lateral part of a pallialeminence. The 
NIssL method, * 1120. 
