TABLE OF CONTENTS. 



REFERENCES TO THE PRINCIPAL PHASES OF DEVELOPMENT IN HYDROZOA 



AND CTENOPHORA. 



For a comparison of tlie earKest stages of development froni tlie ovum to the morula, see the Segmentation of 

 the Egg on 

 Plate I. figs. 1-6, Plate II. fig. 1, Plate 111. figs. 13', 13', 15, 19-21, for the Ilydroida (Hydra, Coryiie, Laomedea, 



and Eucope). 

 Plate IV. figs. 1-4, 21-30, for the Trachymeduste (Polyxenia and Geryonia). 

 Plate VIII. figs. 1-8, for the Acraspeda (Aurelia). 

 Plate IX. figs. 1-7, 9-13, 14-19, for the Ctenophora (Beroe and Pleiirobraehia). 



For the formation of the Blnstula and Gaslrula, see 

 Plate I. figs. 7-11, Plate III. ligs. 145-14', 20-25, for the Hydroiila (Hydra, Eucope, and Laomedea). 

 Plate IV. figs. 5-7, 31-34, for the Traehymedusoe (Polyxenia and Geryonia). 



Plate VI. figs. 10, 20, Plate Vll. figs. 1-5, for the Siiihonopliora (Kpibulia, Physophora, and Agalma). 

 Plate VIII. figs. 9, 10, 11-23, for the Acraspeda (Aurelia). 



For the development of the Larva iclien Sessile, see 

 Plate V. figs. 24''-24'', for the hydroid formed from a free frustule (Schizocladium). 

 Plate III. 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 (Aglaoplienia). 

 Plate VIII. figs. 24-39, Plate V. fig. 23 (Aurelia and Lucernaria). 



For the development of the Bad which becomes a Gonophorc, see 

 Plate I. figs. 1-6, 12-14 (Hydra and Myriothela). 

 Plate II. figs. 2-11, 14-21 (Coryne and Hyliooodon). 

 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 III. figs. 5, 5" (Obelia). Plate HI. figs. 27-30, Plate V. fig. 10, Actinula (Tubnlaria). 

 Plate IV. figs. 16-20, 35, 36 (Cunina and Geryonia). 

 Plate V. figs. 8, 9, Sporosac (Dicoryne); fig. 11, Ambulatory medusa (Clavatella); figs. 12, 14, 15, 16, 17, 18, 19 



(Perigonimus, Bougainvillia, Oceania, Zygodaetyla, and Willia). 

 Plate VI. figs. 8, 9 (Porpita, Velella). 

 Plate VIII. figs. 40-49, Plate V. lig. 26, for the Ephyra (Aurelia). 



For the development of the External Outline'^ of Larvec which arc 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, Agalniopsis, Agalma, Physophora, Praya, Di])lophysa, 



Diphyes, and Muggisa). 

 Plato IX. figs. 24-50, for the Ctenophora (Beroe, Chiaja, Callianira, Hormiphora, Pleurobrachia), Plate X. figs. 1- 



20 (Beroe, Cestus, Chiaja, Lampetia, Ocyroe). 



