Chapter Xviii. Crustacea.

History of larval forms, pp. 459-511. Branchiopoda, pp. 459-465. Malacostraca, pp. 465-487. Copepoda, pp. 487-492. Cirripedia, pp. 492-500. Ostracoda, pp. 500-502. Phylogeny of the Crustacea, pp. 502-511. The formation of the germinal layers, pp. 511-521. Comparative development of organs, pp. 521-529.