xiv CONTENTS. 



PAGE 



Bunge's Investigations on Respiration in Ascaris — Respiration in 

 the 3Iyriapoda and Insecta : Griffiths and Lyonnet on the Power 

 of certain Insects resisting Asphyxia ; Trachese and Tracheal 

 GiUs ; Tissue Respiration — Respiration in the Arachnida : Respira- 

 tion by Tracheae, " Lungs," and the General Surface of the Body — 

 Respiration by Branchise and Pigments — Activity of Respiration — 

 Respiration in the Pohjzoa, Brachiopoda, Mollusca, and Tunicata — 

 General Remarks on Invertebrate Respiration, &c. . . . 307 



CHAPTER IX. 



Secretion and Excretion in the Invertebrata : General Remarks on 

 Secretion and Excretion — The Protozoan Contractile Vacuole — 

 Secretion of Lime Carbonate in the Coelenterata : Researches of 

 Murray and Irvine — The Excretory Organs in the Echinodermata : 

 Investigations of Griffiths on the Renal Organs of Uraster — The 

 Renal Organs to the Annelida and Xematoidea — The Secretion of 

 Viscid Matter by the Prototraclieata — Excretory Function of the 

 Malpighian tubules in the Myriapoda — Poisons secreted by Insects : 

 Researches of Poulton ; The Salivary Glands in the Lepidoptera 

 and their Function ; Griffiths' Researches on the Renal Function 

 of the Malpighian Tubules in the Insecta — The Arachnida : Poison 

 Glands of the Arthror/astra and Araneina ; The Arachnidium of the 

 Araneina ; Investigations of Griffiths, Johnstone, and Weinland 

 on the Renal Organs in the Araneina — The Crustacea : The Shell- 

 gland a Renal Organ ; Researches of Griffiths on the Green Glands 

 of Astacus — The Brachiopoda : Secretion of the Shell ; the 

 Functions of the Pseudo-hearts — The IloUusca : Secretion of 

 Lime Carbonate by these Animals ; Formation of Pearls ; Re- 

 searches of Irvine and Woodhead on Shell-formation ; Researches 

 of Griffiths and Follows on the Organ of Bojanus ; Researche s 

 of MacMunn, Griffiths, and others on the Function of the 

 Nephridia in the Mollusca; Secretion of Mucus by the Pulmo- 

 (jasteropoda — Nerves and the Phenomena of Secretion — The 

 Invertebrate Kidney— Comparison of the Invertebrate Kidney 

 with that of the Yertehrata, &c. . . , . .241 



CHAPTER X. 



Nervous Systems of the Invertebrata : General remarks ; Nerve-centres, 

 Nerve-fibres ; Functions of Nerve-fibres— The DiiTused Nervous 



