CONTENTS ■ xiii 



Zoaea larval stages — The ancestral meaning of the Nauplius larva — The develop- 

 ment of the parasitic Copepod, Adheres amWopHtis, and the support whicli it gives 

 to the recapitulation theory of development — The Zoaea larva in Euphausidaoea, 

 Penaeidea, Caridea, Anomura, and Brachyura — Ancestral meaning of the Zoaea 

 larva — The Mysis larval stage : its modification in the Loricata into the Phyllo- 

 soma larva : its modifications among the Crangonidae and Thalassinidae — The 

 Megalopa larval stage of Brachyura — The brephic stages in Anomura — The larval 

 history of Stomatopoda — The Metanauplius, Erichthoidina and Erichthus larval 

 stages — The Alima larva — The larval history of Fortunion as a type of the 

 parasitic Isopoda — The development of Agelena, a type of the Arachnida — Tlie 

 development of Limwlus : its Trilobite larva and the significance thereof — The 

 development of the Scorpion and of some other Arachnida — The development of 

 Pantopoda — The development of Tardigrada — The early development of Donaoia 

 as a type of the embryonic development*of Insecta — The early development of 

 Doryphora — The embryonic development of Blatta and the supposed origin of its 

 mid-gut epithelium — The development of the genital organs in PhyUodromia — 

 The formation of the embryonic membranes in the primitive Aptera (Lepisma and 

 MachUis) — The metamorphosis of Galerucella ulmi as type of the larval history of 

 Insecta — The development of the wings in Doryphora — The development of the 

 compound eye in Dytiscus — The metamorphosis in various families of Coleoptera, 

 Diptera, and Lepidoptera — The complicated metamorphosis of the Muscidae — The 

 meaning of metamorphosis as exemplified by observations on Boiribyx — The 

 development of Scolopendra as type of the Myriapoda — The development of Jiilus 

 — The ancestral history of Arthropoda . .... Page 169 



CHAPTER IX 



MOLLTJSCA 



The development of Patella as a type of the Mollusca — The metamorphoses of Acmaea, 

 Fissurella, and Haliotis — Experiments on the eggs of Patella — The development 

 of Paludina as type for the formation of the internal organs of Gastropoda — The 

 development of Polyplaeophora — Methods of preserving and staining the eggs of 

 Gastropoda — Various modes of the development of the velum in Gastropoda — 

 The larval kidneys of Gastropoda and their supposed homologies — The develop- 

 ment of Solenogastres — The development oiDentalium as type of the Scaphopoda — 

 Experiments on the eggs of Dentalium—1h.e eifect of cutting off the polar lobes of 

 the egg— The development of Dreissensia as a type of the Pelecypoda — Tlie larval 

 development of the oyster — The development of Yoldia as a type of the Proto- 

 branchiata— The mode of development of heart and pericardium in Cyclas—T\ie 

 development of Unionidae— The Glochidium larva— The segmentation of the egg 

 of Sepia as a type of Cephalopod egg— The development of LoUgo as type of the 

 Cephalopoda— The development of the eye of Cephalopoda — General considerations 

 on the ancestral history of the Mollusca .... Page 291 



CHAPTER X 



PODAXONIA 



The development of Phascolosoma as type of the Sipunculoidea— The affinities of 



Podaxonia The development of Sipuneulus— The development of Phoronis : 



various views as to its affinities . ■ • , • ■ Page 372 



