LIST OF WOOD-CUT ILLUSTRATIONS. XX111 



PAGE 



95. Section-Instrument 190 



96. Lever of Contact 203 



97. Spring-Clip 208 



98. Wooden Slide for Opaque Objects 209 



99. Smith's Mounting Instrument 213 



100. Slider-Forceps 214 



101. Spring-Press 215 



102. Dropping-Bottle 224 



103. Shadbolt's Turn-Table 226 



104. Sunk Cells 228 



105. Plate-Glass Cells 229 



106. Tube-Cells 230 



107. Built-up Cells 231 



108. Volvox globator, after Ehrenberg 251 



109. Formation of Amoeboid bodies in Volvox, after Hicks . . 256 



110. Various species of Staurastrum, after Ralfs .... 259 



111. Circulation in Closterium, after S. G. Osborne .... 261 



112. Binary Subdivision of Micrasterias, after Lobb .... 264 



113. Conjugation of Cosmarium, after Ralfs 266 



114. Ditto of Closterium, after Ralfs 267 



115. Binary Subdivision and Conjugation of Didymoprium, after 



Ralfs 268 



116. Development of Pediastrwm granulation, after Braun . . 271 



117. Various forms of Pediastrum, after Ralfs 272 



118. Portion of Isthmia nervosa, after Smith 278 



119. Triceratium favus, after Smith 279 



120. Pleurosigma quadratum, after R. Beck 281 



121. Biddulphia pulchella, after Smith 283 



122. Conjugation of Epithemia, after Thwaites 285 



123. Conjugation of Melosira, after Thwaites 286 



124. Meridion circulare, after Smith 290 



125. Bacillaria paradoxa, after Smith 290 



126. Licmophora flabellata, after Smith 291 



127. Diatoma vulgare, after Smith 292 



128. Grammatophora serpentina, after Smith 292 



129. Surirella constricta, after Smith 294 



130. Campylodiscus costatus, after Smith 295 



131. Melosira subflexilis, after Smith 296 



132. Melosira varians, after Smith 296 



133. Actinoptychus undulatus, after Smith 299 



134. Isthmia nervosa, after Smith 301 



135. Chostoceros Wighamii, after T. West 303 



136. Bacteriastrum furcatum, after T. West 303 



137. BJiizosolenia imbricata, after Brightwell 304 



138. Achnanthes longipes, after Smith 304 



139. Gomphonema geminatum, after Smith 305 



140. Separate frustules of ditto, after Smith 306 



141. Schizonema Grevillii, after Smith 307 



142. Mastogloia Smithii, after Smith 309 



143. Mastogloia lanceolata, after Smith 309 



144. Fossil Bialomaceo?, from Oran, after Ehrenberg .... 312 



145. Fossil Biatomaceoz, from Mourne mountains, after Ehrenberg . 313 



146. Ho3matococcus sanguineus, after Hassall 318 



147. Successive stages of development of Ulva, after Kutzing . . 319 



