Part 8

152. Pentacrinus 121

153. ALECTO MERIDIONALIS 122

154. Young Comatulæ 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 development 129

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

172. Very young Star-fish seen in profile 130

173-175. Larvæ 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-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 rocky beach 149

ABBREVIATIONS OF THE NAMES OF AUTHORS.

AG. L. Agassiz.

A. AG. A. Agassiz.

AYRES W. O. Ayres.

BLAINV. Blainville.

BOSC Bosc.