TABLE OF CONTENTS. Uf 
REFERENCES TO THE PRINCIPAL PHASES OF DEVELOPMENT IN HYDROZOA 
AND CTENOPHORA. 
For a comparison of the earliest stages of development from the ovum to the morula, see the Segmentation of 
the Egg on 
Plate I. figs. 1-6, Plate II. fig. 1, Plate III. figs. 13%, 185 15, 19-21, for the Hydroida (Hydra, Coryne, Laomedea, 
and Eucope). : : 
Plate IV. figs. 1-4, 21-30, for the Trachymeduse (Polyxenia and Geryonia). 
Plate VIII. figs. 1-8, for the Acraspeda (Aurelia). 
Plate IX. figs. 1-7, 9-13, 14-19, for the Ctenophora (Beroé and Pleurobrachia). 
For the formation of the Blastula and Gastrula, see 
Plate I. figs. 7-11, Plate II. figs. 14s-14*, 20-25, for the Hydroida (Hydra, Eucope, and Laomedea). 
Plate 1V. figs. 5-7, 31-34, for the Trachymeduse (Polyxenia and Geryonia). 
Plate VI. figs. 10, 20, Plate VII. figs. 1-5, for the Siphonophora (Ipibulia, Physophora, and Agalma). 
bs Plate VIII. figs. 9, 10, 11-23, for the Acraspeda (Aurelia). 
For the development of the Larva when Sessile, see 
Plate V. figs. 249-242, for the hydroid formed from a free frustule (Schizocladium). 
Plate IIL. figs. 6-11, 12-12%, 17, 18, for the development of the hydranth (Clytia and Laomedea). 
Plate V. figs. 25°-25°, for the development of the Corbula (Aglaophenia). 
Plate VIII. figs. 24-39, Plate V. fig. 23 (Aurelia and Lucernaria). 
For the development of the Bud which becomes a Gonophore, sce 
Plate I. figs. 1-6, 12-14 (Hydra and Myriothela). 
Plate II. figs. 2-11, 14-21 (Coryne and Hybocodon). 
Plate III. figs. 1-4, 15, 16, 26 (Obelia, Laomedea, and Tubularia). 
Plate III. figs. 7-19, Plate V. figs. 20-22 (Cunina and Lizzia). 
For the Free swimming Larva developed from the Bud, see 
Plate I. figs. 20-22, Actinula (Myriothela). 
Plate II. figs. 12, 13, 22, 23 (Sarsia). 
Plate IIT. figs. 5, 5° (Obelia). Plate III. figs. 27-30, Plate V. fig. 10, Actinula (Tubularia). 
Plate IV. figs. 16-20, 35, 36 (Cunina and Geryonia). 
Plate V. figs. 8, 9, Sporosac (Dicoryne); fig. 11, Ambulatory medusa (Clavatella) ; fies. 12, 14, 15, 16, 17, 18, 19 
(Perigonimus, Bougainyillia, Oceania, Zygodactyla, and Willia). 
Plate VI. figs. 8, 9 (Porpita, Velella). 
Plate VIII. figs. 40-49, Plate V. fig. 26, for the Ephyra (Aurelia). 
For the development of the External Outlines of Larve which are never sessile, see 
Plate IV. figs. 7-10, 16, 20, 34-36 (Polyxenia, Cunina, and Geryonia). Plate V. figs. 1-7, 26 (Glossocodon and 
Cyanea). 
Plate VI. figs. 2-7, for the Discoidea (Velella and Porpita), Plate VII. figs. 1-29, Plate VI. figs. 1, 10-31, for the 
Siphonophora (Physalia, Epibulia, Gleba, Halistemma, Agalmopsis, Agalma, Physophora, Praya, Diplophysa, 
Diphyes, and Muggiiea). 
Plate IX. figs. 24-50, for the Ctenophora (Beroé, Chiaja, Callianira, Hormiphora, Pleurobrachia), Plate X. figs. 1- 
20 (Beroe, Cestus, Chiaja, Lampetia, Ocyroé). 
