Entoprocta, pp. [292‑297]. Ectoprocta, pp. [297‑305]. Summary and general considerations, pp. [305‑308].
Chapter XI. Brachiopoda.
Development of the layers, pp. [311‑313]. The history of the larva, pp. [313‑317]. Development of organs, p. [317]. General observations on the affinities of the Brachiopoda, pp. [317], 318.
Chapter XII. Chætopoda.
Formation of the germinal layers, pp. [319‑325]. The larval form, pp. [325‑338]. Formation of organs, pp. [338‑342]. Alternations of generations, pp. 342, 343.
Chapter XIII. Discophora.
Formation of layers, pp. [347‑350]. History of larva, pp. [351‑354].
Chapter XIV. Gephyrea.
Gephyrea nuda, pp. [355‑361]. Gephyrea tubicola, pp. [361‑364]. General considerations, p. [364].
Chapter XV.