Tergum, 96, 143 
Terminal plates, 189 
Terminology, scientific, 14 
Testis, 129 
structure of, 133 
Thoracic appendages, 164 
development of, 217 
somites, 150 
Thorax, 19, 141 
Tissue, 175 
Touch, organ of, 113 
Transformism, 318 
TREVIRANUS, referred to, 4 
Tribe, 252 
Trichobranchiz, 263 - 
Troglocaris, 337 
Vv. 
Valves of heart, 73 
of stomach, 59 
Van HELMONT, quoted, 45 
Variety, 290, 292 
Vas deferens, 130 
Vent, see Anus 
Vertebrata, 284 
INDEX. 371 
Vertebrata, eye of, 122, 125 
Visual pyramid, 121 
rod, 121 
Vitelline membrane, 133 
Vitellus, 133 
Voluntary action, 112 
VON DER MARCK, 317 
Ww. 
Warp, J., referred to, 354 
WASSILIEW, quoted, 353 
Whirlpool of life, 84 
WILL, quoted, 353 
Woop-Mason, quoted, 44 
Y. 
Yelk, 133 
‘Yelk-division, 205 
Young of Astacus, newly hatched, 
characters of, 219 
Z, 
Zowa stage of development, 280 
THE END. 
PRINTED BY WILLIAM CLOWES AND SONS, LIMITED, LONDON AND BECCLES, 
