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CONTENTS
Vlll
(:. Heavy Metals in Ascidian Blood
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. . 73
1). Agglutination
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.. .. .. . . 81
E. Blood Function . .
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.. 81
X. Nitrogen Excretion
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. I
.. .. .. 82
XT. The Nervous System
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A. 8tructure of the Nervous System
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. . 86
B. The Visceral Innervation
.. .. , . 89
1). Photoreception
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.. .. .. . . 96
E. The Somatic Motor System
. . . . . . 98
F. Synaptic Transmission . . . . .. .. 103
G. Neurosecretion
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C. The 8ensory System
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.. .. . . 93
XI[. T h e Neural Gland..
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. . . . .. 107
A. Structure and Clyolic Activity . .
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. . 107
C. Functions of the Neural Gland ' . . .. .. 113
R. Origin of t h e Neural Gland
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. . 112
XIII. The Dorsal Strand
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. .
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. . 123
XIV. Conclusion . . . . . . * . .. .. .. 126
XV. Acknowledgements
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. . 128
XVI. References . .
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.. . . . . 129
Some Aspects of Neoplasia in Marine Animals
T H E LATE LIONEL E. MAWDESLEY-THOMAS
I. Introduction
.. .. .. .. .. .. 151
11. Neoplasia in Marine Invertebrates
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.. . . lh2
111. Neoplasia in Fish . .
.. .. .. .. .. 162
IV. Taxonomic Dist,ribution of Neoplaaia in Marine Fish. . 183