LIST OF THE WOOD-CUTS. XI 



131. TOXOPNEUSTES DROBACHIENSIS 102 



132. Portion of shell of Fig. 131 without spines (Agassiz) . . 103 



133. Sea-urchin shell without spines (Agassiz) 103 



134. Sea-urchin from the mouth side (Agassiz) 104 



135. Magnified spine 104 



136. Transverse section of spine 105 



137. Pedicellaria of Sea-urchin 105 



138. Teeth of Sea-urchin lOG 



139. ECHINARACIINIUS PARMA 107 



140. Transverse section of Echinarachnius (Agassiz) .... 108 



141. Ray of Star-fish, seen from mouth side (Agassiz) .... 109 



142. ASTRACANTHION BERYLINUS 110 



143. Single spine of Star-fish . .111 



144. Limestone network of back of Star-fish Ill 



145. Madreporic body of Star-fish Ill 



146. Cribrella oculata 112 



147. Ctenodiscus crispatus 114 



148. Ophiopholis bellis 115 



149. Arm of Fig. 148, from the mouth side (Agassiz) . . . .116 



150. Tentacle of Ophiopolis . . 116 



151. ASTROPHYTON AgASSIZII 118 



152. Pentacrinus 121 



153. Alecto meridionalis 122 



154. Young Comatulc'e . 122 



155. 156, 157. Egg of Star-fish in different stages of development . 124 



158. Larva just hatched from egg 125 



159-164. Successive stages of development of Larva .... 125 



165. Larva in which arms are developing 126 



166. Adult Star-fish Larva (Brachiolaria) 127 



167. Fig. 166 seen in profile 128 



168 - 170. Young Star-fish (Astracanthion) in different stages of devel- 

 opment 129 



171. Lower side of ray of young Star-fish 130 



172. Very young Star-fish seen in profile 130 



173-175. Larvae of Sea-urchin (Toxopneustes) in different stages of 



development .• 130, 131 



176. Adult Larva of Sea-urchin 132 



177. Fig. 176 seen endways 133 



178. Sea-urcliin resorbing the arms of the larva 133 



179-181. Successive stages of young Sea-urchin . . . 133,134 



182. Ophiuran which has nearly resorbed the larva .... 135 



183. Larva of Ophiuran (Pluteus) 136 



184. Young Ophiuran 137 



185. Cluster of eggs of Star-fishes over mouth of parent ._ . . 137 

 Diagram of a rocky beach 149 



