774 
MR. A. SANDERS ON THE ANATOMY OF THE 
v.h. Ventricle of the hypoarium. 
v.li.g. Ventral horn of grey matter with ganglion cells. 
v.l.c. Ventral longitudinal column. 
v.op.l. Ventricle of the optic lobe. 
v.pi. Ventricle of the pituitary body. 
v.r. Ventral root of the spinal nerve. 
v.t.c. Ventral transverse commissures of the medulla. 
v.tli. Third ventricle. 
v.v.c. Ventricle of the valvula cerebelli. 
Except when otherwise stated , all the illustrations are taken from specimens of 
Mugil cephalus. 
Fig. 1, PI. 58. Longitudinal and vertical section through the brain of Grey Mullet 
[Mugil cephalus ) made close to the mid-line. X 20. 
Fig. 2, PI. 58. Horizontal section through the brain of the Grey Mullet [Mugil 
cephalus ) made on the level of the third ventricle. X 20. 
Fig. 3, PI. 59. Transverse section through the anterior end of the optic lobes, showing 
third ventricle. Infundibulum and pituitary body. 
Fig. 4, PI. 60. Transverse section through the optic lobe, valvula cerebelli and torus 
semicircularis, and anterior end of the aqueduct of Sylvius. 
Fig. 5, PL 61. Transverse section through the origin of the nervus motor oculi and 
the commissura ansulata. 
Fig. 6, PI. 62. Transverse section through the trochlearis nerve. This section was 
composed from the inspection of several consecutive sections. It goes 
through the anterior end of the cerebellum and the posterior extremity of 
the optic lobe. 
Fig. 7, PI. 63. Transverse section through the anterior root of the trifacial. 
Fig. 8, PI. 64. Transverse section through the posterior end of the trifacial nerve, 
through the acusticus and through the abducens. This is taken from two 
or three contiguous sections of the same subject. 
Fig. 9, PI. 65. Transverse section through the narrow part of the fourth ventricle 
behind the crura cerebelli, through the anterior part of the ganglion of 
the vagus, and through the ganglion of the abducens. The fibres which 
eventually form the commissura ansulata first make their appearance in 
this section. 
Fig. 10, PI. 59. Transverse section through the posterior part of the fourth ventricle 
and the tuberosity and ganglion of the vagus. 
