LIST OF ILLUSTRATIONS 



144. Carpet beetle, larva, and pupa 



145. Culex and larva . 



146. Internal organs of cockroach 



147. Periplaneta, its tracheal system 



148. Periplaneta, nervous system 



149. Honey bee, queen, worker, and drone 



150. Red ant, male, worker, and female 



151. Euscorpio . 



152. Scorpion, ventral side . 



153. Scorpion, internal organs 



154. Epeira diadema . 



155. Cattle tick . 



156. Itch mite 

 J 57. Limulus, ventral view . 



158. Anodonta cygnea, entire animal 



159. Anodonta cygnea, right valve, and animal 



160. Anodonta, section of shell and mantle 



161. Anodonta cygnea, animal 



162. Anodonta cygnea, dissection from left side 



163. Anodonta cygnea, sections of gills 



164. Anodonta, diagram of circulatory system 



165. Anodonta, embryo and glochidium 



166. Mytilus edulis 



167. Teredo navalis ..... 



168. Chiton spinosus ..... 



169. Chiton, ventral view .... 



170. Chiton, nephridial and genital systems 



171. Helix nemoralis ..... 



172. Triton nodiferus, shell 



173. Triton nodiferus, median section of shell 



174. Solarium perspectivum, under side 



175. Terebra oculata, shell .... 



176. Cypnea moneta, animal expanded, in its shell 



177. Doris tuberculata 



178. Shell-bearing Pteropoda 



179. Patella vulgata, animal, ventral view 



180. Limax, lung-cavity, etc. 



181. Triton nodiferus .... 



