xxii LIST OF ILLUSTRATIONS 



FIG. PAGE 



87. Crayfish, gills 356 



88. Crayfish, diagram of circulation of blood 340 



89. Crayfish, early development 344 



90. Crayfish, early embryo in nauplius stage 345 



91. Crayfish, later embryo 346 



92. Mussel, side view, and shell 351 



93. Mussel, diagrammatic sections 353 



94. Mussel, dissection 356 



95. Mussel, structure of gill 358 



96. Mussel, circulatory system . 361 



9''. Mussel, advanced embryo and free larva 364 



98. Dogfish, side view 367 



99. Dogfish, diagrammatic sections 370 



100. Dogfish, skull 373 



loi. Dogfish, vertebrae 376 



102. Dogfish, pectoral arch 378 



103. Dogfish, dissection 380 



104. Dogfish, vascular system 385 



104a. Dogfish, diagram of circulation 389 



105. Dogfish, brain 392 



106. Dogfish, early embryo 398 



107. Dogfish, advanced embryo 399 



108. Mosses, various genera, anatomy and histology 402 



109. Funaria, reproduction and development 406 



no. /"/^rw and ^jr/«fl^/«w, anatomy and histoloj > 414 



111. Ferns, various genera, reproduction and development . . . 424 



112. .£^i«>5/«w?, aerial shoot and spores . 4,35 



113. .fff^zMW^w;, reproduction and developm 437 



114. 6'a/OT«/fl, part of plant 439 



115. 6'a/z'm«a, reproduction and developmen ....... 44,1 



116. &/a^«(?//a, part of plant and sporan '.a 443 



117. &/i2^«^//a, reproduction and develoiment 445 



118. /*/«?/.?, sections of stem 449. 



119. Gymnosperms, reproduction and development 453I 



120. Finns, stamen 4551 



