% Boy, 
192 Proceedings of the Royal Physical Society. 
LIST OF ABBREVIATIONS USED IN FIGURES. 
PARTS OF BRAIN— 
cbl. Cerebellum. opt.ch. Optic Chiasma. 
cbr. Cerebrum., opt.l. Optic Lobes. 
cm. Corpora Mammillaria, pit.b. Pituitary Body. 
dien. Diencephalon. pes Pineal Stalk, Base of. 
wnf.l. Inferior Lobes. rb. Restiform Body. 
inf. Infundibulum, ssc. Somatic Sensory Column. 
L.U.U. Lobus Linize Lateralis. 8.0. Saccus Vasculosus, 
med. Medulla. tel. Hemisphere Region. 
m.l.b. Median Longitudinal Bundle, vel, Velum, 
ol, Olfactory Lobe. v.s.c. Visceral Sensory Column, 
NERVES— 
II Optic Tract. VII‘ Facial: Branches— 
III Motor Oculi. VII 8. Buccal. 
IV Patheticus, VITh. Hyomandibular, 
V Trigeminal: Branches— VII oph. Ophthalmic. 
Vian. Mandibular, Vil p: Palatine. 
Vme. Maxillary. VIIL Auditory. 
V oph. Ophthalmic. IX Glossopharyngeal. 
V prof. Profundus. X Vagus: Branches— 
VI Abducens, X br. Branchial. 
X ll. Lateral Line, 
Xv. Visceral, 
OTHER STRUCTURES— 
ac, Auditory Capsule. : re.  Rectus Externus Muscle. 
cc. Cranial Cavity. rf. Rectus Inferior Muscle. 
g.s.  Gill-slit. r,s. Rectus Superior Muscle, 
0.v.  Obliquus Inferior Muscle. rt. Rectus Internus Muscle. 
0.8. Oblquus Superior Muscle. sp. Spiracle. 
ol.o. Olfactory Organ. sp.c. Spinal Cord. 
The author is indebted to the Carnegie Trust for a grant to cover the cost of repro- 
ducing the drawings which form Plates XIIL-X VIII. 
(Issued separately, 4th October 1919.) 
