Chapter Vii. _the Oursin or Sea Hedgehog._ See the Curious

dissertations in which M. Cailland has described his discoveries.

Chapter VIII. Shells, Pearl, and Mother of Pearl. The capital work on these is Blainville's Malacology. See, also, on the Pearl Mabius of Hamburgh, Revue Germ., July 31, 1858. I have profitably consulted on this subject our celebrated Jeweller, M. Froment Meurice.