LIST OF THE WOOD-CUTS. xi 



131. TOXOPNEUSTES DROBACHIENSIS 102 



132. Portion of sheU of Pig. 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 IO4 



136. Transverse section of spine I05 



137. Pedicellaria of Sea-urchin IO5 



138. > Teeth of Sea-urchin lOg 



139. EOHINAKAOHNIUS PARMA 107 



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



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



142. ASTEAOANTHION BEKYLIN0S HO 



143. Single spine of Star-fish HI 



144. Limestone network of back of Star-fish HI 



145. Madreporic body of Star-fish HI 



146. CrIBREHA OC0LATA H2 



147. Ctenodiscus ceispatus 114 



148. Ophiopholis bellis 115 



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



150. Tentacle of Ophiopolis 116 



151. ASTROPHYTON AgASSIZH .... .... 118 



152. Pentacrinus , 121 



153. Alecto meridionalis 122 



154. Young Comatute . . ' 122 



155. 156, 157. Egg of Star-flsh 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 (Braohiolaria) 127 



167. Pig. 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. LarvsB of Sea-urchin (Toxopneustes) in different stages of 



development 130, 131 



176. Adult Larva of Sea-urchin 132 



177. Pig. 176 seen endways 133 



178. Sea-urchin 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 rooky beach 149 



