CONTENTS. xiii 



CHAPTER VI. 



PAGE 



The Blood in the Invertcbrata : The Size of some Invertebrate Cor- 

 puscles — Coagulation of Invertebrate Blood — The Protozoa and 

 Par if era devoid of Blood — The Blood in the Actinozoa and 

 Echinodermata — The Blood in the Jlyriajjoda : Three distinct 

 Corpuscles — The Blood in the Annelida : The Fluids of the 

 Perivisceral Cavity and the Pseudo-haemal System ; First appear- 

 ance of a Coloured Corpuscle ; Researches of MacMunn, Lankester, 

 Delle Chiaje, Schwalbe, Krukenberg, and Milne-Edwards — The 

 Blood in the Insecta : Pigments of the Blood ; Researches of 

 Poulton and Fredericq ; Coagulation of Insects' Blood — The Blood 

 in the Crustacea : Investigations of Fredericq ; Percentages of 

 Saline Matter in Crustacean Blood ; Densities of Crustacean 

 Blood ; Blood of the Mollusca : Researches of Griffiths, Cuenot, 

 Fredericq, and Krukenberg ; Transport of Oxygen by means 

 of Hjemocyanin ; Percentages of Saline Matter in MoUuscan 

 Blood ; Saline Composition of Molluscan Blood — The Chro- 

 matology of Invertebrate Blood : Researches of MacMunn, 

 Poulton, and others ; The Heemoglobin of Lumhricus ; Micro- 

 spectroscopes — Griffiths' Researches on the Gases of the Inverte- 

 brate Blood — General Remarks, &c. . . . . -125 



CHAPTER VII. 



Circulation in the Invertcbrata: Fusion of Circulation and Digestion 

 in the Protozoa, Porifera, and Ctdenterata— Blood and Vascular 

 Systems in the Eclunodermuta and Annelida — Circulation in the 

 Trichoscolices, Artkropoda, Polyzoa, Brachiqpoda, MoUusca, and 

 Tunicata, &c 182 



CHAPTER VIII. 



Respiration in the Invertebrata : Respiration in the Protozoa, Porifera, 

 Cidenterata : Respiratory Pigments ; Researches of Moseley, 

 MacMunn, M'Kendrick, Krukenberg, and De Negri ; Internal or 

 Tissue Respiration ; Respiration in the Echinodermata ; Investi- 

 gations of Duges, MacMunn, and Foettinger — Respiration in the 

 Trichoscolices and Annelida : Researches of MacMunn, Geddes, 

 Beddard, and Vejdovsky — Respiration in the Xematoscolices : 



