LIST OF ILLUSTRATIONS 



XI 



FIG. PAGE 



118. Stepheoceras (Normanhites) braikenridgei, Inferior Oolite . 277 



119. Cardioceras cordatum, Oxfordian 277 



120. Section of guard and phragmocone of Belemnites . . . 281 



121. Phragmocone and pro-ostracum of Belemnites . . . 282 



122. Restoration of a Belenmite ....... 282 



122 a. Arms of Belemnites, Lias 283 



123. Calymene tuberculata, Wenlock Limestone .... 292 



124. jEglina binodosa, Arenig Beds ...... 295 



125. Calymene tuberculata. Ventral surface of head . . . 296 



126. Hypostome of Asaphus tyr annus, Llandeilo Beds . . . 296 



127. Thoracic segment of Asaphus expansus ..... 297 



128. Under surface and limbs of Triarthrus becki, Ordovician . 299 



129. Development of Trilobites 301 



130. Paradoxides davidis, Menevian Beds ..... 301 



131. Olenus cataractes, Lingula Flags . . .... 305 



132. Asapthus tyrannus, Llandeilo Beds ...... 306 



133. A cidaspis prevosti, Silurian ....... 309 



131. Estheria minuta, Trias ........ 312 



135. Cypris Candida, Recent ........ 313 



136. Beyrichia complicata, Bala Beds 314 



137. Lepas australis, Recent 316 



138. Paranebalia longipes, Recent . ...... 319 



139. Hymenocaris vermicauda, Lingula Flags .... 321 



140. Caryocaris wrighti, Arenig Rocks ...... 322 



141. Nyctiphanes norvegica, Recent ...... 324 



142. Archaoniscus brodiei, Purbeckian ...... 325 



143. Glyphea regleyana, Oxfordian ..... . 328 



144. Ventral surface of Limulus polyphemus, Recent . . . 338 



145. Dorsal surface of Limulus polyphemus, Recent . . . 339 



146. Hcmiaspis limuloides, Ludlow Beds ..... 342 



147. Dorsal surface of Pterygotus osiliensis, Silurian . . . 344 



148. Ventral surface of same ....... 345 



149. Restoration of ventral surface of Slimonia, Silurian . . 349 



150. Ventral surface of Scorpio, Recent . ..... 351 



151. Restoration of Palaophonus, Silurian ..... 353 



