LIST OF ILLUSTRATIONS. 



FIG. 



94- 

 95- 

 96, 



97- 

 98. 



99- 

 100. 



lOI. 



102. 



104. 

 105. 

 106. 

 107. 

 108. 

 109. 

 no. 

 III. 



112. 



113- 



114. 

 115. 

 116. 

 117. 

 118. 

 119. 



120. 

 121. 

 122. 



123- 



124. 

 125. 



126. 

 127. 

 128. 

 129. 

 130. 



Embryo oi Peripatiis cafensis. (KoRSCHELT and Heider), 



Mouth appendage.? of cockroach. (Dufour), 



Transverse section of insect. (Packard), 



Head and mouth parts of bee. (Cheshire), 



Nervous system of bee. (Cheshire), 



Food canal of bee. (Cheshire), . 



Joints of cockroach's leg, 



Young May fly or Ephemerid. (Eaton), 



Diagrammatic cross section of an Invertebrate, with 



primary body cavity. (Ziegler), 

 Diagrammatic cross section of an Invertebrate, with 



secondary and a primary body cavity. (ZlEGLER), 

 Diagram of insect embryo. (KoRSCHELT and Heider), 

 Scorpion, ...... 



Section of lung book. (Macleod), 



Linndus or king crab, .... 



Young Limiilus. (Walcott), 



Vertical cross section of a Trilobite, Calyinene. (Wai COTT), 



Ideal mollusc. (Lankester), 



Stages in MoUuscan development, . 



Chiton. (Pretre), 



Dorsal view of nervous system of Chiton. (Pelseneer), 



Projieonienza. Nervous system. (Huerecht), 



'Dissection- oi Helix pomatia. (Leuckart), 



Diagram of larva of /'a/'?(o'/«a. (Erlanger), 



Stages in MoUuscan development, . 



Nervous system of Molluscs, 



StiMQlnrt oi Anodo!2ta. (Rankin), 



Development of ^woaiiKfa. (Gcette), 



Diagram of the structure of Sepia. (Pelseneer), 



Diagram of circulatory and excretory systems in a Decapod 



like Sepia. (Pelseneer), 

 Section of shell of Nautilus. (Lendenfeld), 

 Male oi Balanoglossus kowalevski. (Bateson), 

 Transverse section through gill slit region of Ptyelwdera 



minuta. (Spengel), 

 Development o{ Balanoglossus. (Bateson), 

 Tornaria larva, from the side. (Spengel), 

 Dissection of ascidian. (Herdman), 

 Dissection of ascidian. (Herdman), 

 Young embryo of ascidian (Clavellina). (V.an Beneden 



and Julin), ...... 



294 

 296 

 300 

 302 



303 

 308 

 309 



316 



316 

 320 

 328 

 333 

 338 

 340 

 341 

 34+ 

 344 

 345 

 346 

 346 

 355 

 356 

 360 

 366 

 368 



371 

 3S0 



3S1 

 3S4 

 392 



394 

 396 

 397 

 403 

 405 



407 



