CONTENTS. Xili 
CHAPTER XV. 
General characters of the Arachnida—Podosomata—Acarina— 
Pedipalpi—Araneida, . f : : : : 149-154 
CHAPTER XVI. 
General characters of the Myriapoda — Centipedes — Milli- 
pedes, : ? : ‘ ; : : 155-156 
He. 
CHAPTER XVII. 
General characters and anatomy of Insects—Metamorphosis of 
Insects, . : é “ , , . : : 157-164 
CHAPTER XVIII, 
Orders of Insects — Anoplura — Mallophaga -——- Thysanura — 
Hemiptera — Orthoptera — Neuroptera — Aphaniptera — 
Diptera—Lepidoptera— Hymenoptera—S trepsiptera—Co- 
leoptera—Tabular view of the divisions of the sub-kingdom 
Annulosa, , : ‘ : : é : : 165-178 
CHAPTER XIX. 
General characters of the Mollusca—Primary divisions of the 
Mollusca, : : . ; ‘ : : : 179-183 
CHAPTER XxX. 
Molluscoida — General characters of the Polyzoa — General 
characters of the Tunicata— General characters of the 
Brachiopoda, . : ; ‘ : : ot ag 184-192 
CHAPTER XXI. 
Classes of the Mollusca Proper—General characters of the La- 
mellibranchiata—General characters of the Gasteropoda— 
Nudibranchiata—Heteropoda—Air-breathing Gasteropods 
—Pteropoda, , ‘ : ' ; 193-204 
CHAPTER XXII. 
General characters of the Cephalopoda—Reproductive process 
in the Cuttle-fishes—Shell of the Cephalopoda—Dibran- 
chiata — Tetrabranchiata— Orthocerata — Ammonites — 
Tabular view of the main divisions of the Mollusca, . 205-214 
CHAPTER XXIII. 
General characters of the Vertbrata—Skeleton of Vertebrates 
—Structure of a Vertebra—Vertebral column—Limbs of 
Vertebrates—Digestive system—Circulatory system—KRe- 
spiratory system—Nervous system— Reproduction — Pri- 
mary divisions—Ichthyopsida—Sauropsida—Mammalia, 215-226 
