FIG. 
15. 
16. 
18, 
LIST OF ILLUSTRATIONS, 
LeEcs oF BIRD AND CHICK . ° 
MEDUSA, TIAROPSIS DIADEMA . 
STAURIDIUM. MEDUSA, CLADONEMA RADIATUM 
SPERMATOZOA . . ° ° 
SECTION OF LARVA OF CALCAREOUS SPONGE 
EMBRYO OF HYDROPHILUS PICEUS 
SESSILE STAGE OF CRINOID. ‘ 
LARVA OF CRAYFISH . 3 . 
GRAPTOLITES . ™ . . . 
TRILOBITES REMIPES . ° . 
PALZONISCUS. . . ° . 
LARVA OF ECHINODERM é . 
LARVA OF SEA-SNAIL . ° ° 
STAURIDIUM. CLADONEMA . * 
HYDRACTINEA CARNEA . s 5 
LARVA OF PARASITIC CRUSTACEA 
AXOLOTL ‘ ‘ i D . 
AMBLYSTOMA . . . . ° 
AMMONITES HUMPHRESIANUS * 
ANCYLOCERAS. . . * . 
SECTION OF LARVA OF CALCAREOUS SPONGE 
LARVA OF LANCELET . « . 
LARVA OF ASCIDIAN . ‘ ‘ 
FULL-GROWN ASCIDIAN. 5 ‘ 
IMPRESSION OF TAIL OF ARCH/EOPTERYX 
SKELETONS OF FEET: ANCHITHERIUM, HIPPARION, HORSE 
. 
. 
° 
203 
204 
207 
208 
209 
214 
216 
217 
@5r 
253 
255 
266 
274 
