xiv , CONTENTS. 



pA.az 



Bnnge's Investigations on Respiration in ^soart's— Bespiration in 

 the Myriapoda and Insecta : Griffiths and Ljonnet on the Power 

 , of certain Insects resisting Asphyxia ; Trachea and Tracheal 

 Gills.; TissueEespiration— Respiration in the J.racAm«Wa; Respira- 

 tion by Trachea, " Lungs," and the General Surface of the Body- 

 Respiration byBranchise and Pigments — Activity of Respiration 

 Respiration' in fhePolyzoa, Brachiopoda, Mollusca, and TunicatOr— 

 General Remarks on Invertebrate Respiration, &c. . • • 207 



CHAPTER IX. 



Secretion and Excretion in the Invertebrata : General Remarks on 

 Secretion and Excretion — The Protozoan Contractile Vacuole — 

 Secretion of Lime Carbonate in the Ccelenterata : Researches of 

 Murray and Irvine — The Excretory Organs in the Ediinodermata : 

 Investigations of Griffiths on the Renal Organs of Uraster — The 

 Renal Organs to the Annelida and Nematoidea — The! Secretion of 

 Viscid Matter by the Prototracheata — 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 theArthrogastra snA Araneina ; The Arachnidium of the 

 Araneina ; Investigations of Griffiths, Johnstone, and Weinland 

 on the Renal Organs in the Araneina — The Ontstacea : 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 Mollusca: 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 ; Researches 

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

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

 gasteropoda — Nerves and the Phenomena of Secretion — The 

 Invertebrate Kidney — Comparison of the Invertebrate Kidney 

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



CHAPTER X. 



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

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



