Brain and Cranial Nerves of Acanthias vulgaris. 191 
But the careful examination of the drawings brings out the fact that all 
these three species have a dorsal and a bundle of ventro-lateral roots (lateral 
in Pristiurus). The fibres of the dorsal root come down and combine with 
those of the other roots, and then the various branches of VII and V can be 
to some extent identified. So that the roots of these nerves which emerge 
from the Medulla are but factors of the various branches; they are few in 
number; their arrangement is the same in every case, but is quite different 
from what, according to the ordinary text-book figure, has been found in 
Scyliium. 
Note-——Since the above paper was read, I have been able to dissect the 
VIlIth, VIIth, and Vth complex in Scylliwm. It is just on the same plan as 
the others—one dorsal root emerging from underneath the Lobus Linize 
Lateralis, and the others coming off laterally. These others are three in 
number, the middle one being rather dorsal to the hindmost, which is the 
root of VIII. Fibres from the dorsal root pass down to the lower branches 
and forward to the Ophthalmic branch of VII, while fibres from the lateral 
roots pass out to the lower branches or up to the Ophthalmic ones, so that the 
brain has the appearance shown in the text-figure (p. 190). 
BIBLIOGRAPHY. 
JACKSON and CLaRKE. The Brain and Cranial Nerves of Hchinorhinus spinosus, 
Journ. Anat., vol. 10. 
JOHNSTON, J. B. Nervous System of Vertebrates, Lond., 1907. 
JOHNSTON, J. B. Nervus terminalis in Reptiles and Mammals, Journ. 
Comp. Neurol., vol. 23, 1913. 
Kerr, J. GRAHAM. Development of Lepidosiren: the Skin and its Deriva- 
tives, Y.J.M.S., vol. 46, 1902. 
Rerzius, M. G. Das Gehororgans der Wirbelthiere, Stockholm, 1881, 
WIEDERSHEIM, R. Anatomie der Wirbelthiere, Jena, 1909. 
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