CONTENTS. 
CHAPTER XVII. 
ANNULATA (continued). 
Nephrops ... 
Blatta 
Peripatus ... 
Epeira 
The Annulata 
CHAPTER XVIII. 
MOLLUSCA. 
Helix 
Anodon 
Sepia a 
The Mollusca 
CHAPTER XIX. 
CHORDATA. 
Ascidia 
Amphioxus 
CHAPTER XxX. 
CHORDATA (continued). 
Myxine, as a Type of Cyclostomata 
Raia, as a Type of Pisces 
Gadus 
CHAPTER XXI. 
CHORDATA (continued). 
Rana, as a Type of Amphibia ... 
CHAPTER XXII. 
CHORDATA (continue.). 
Columba, as a Type of Aves 
xili 
204 
231 
233 
237 
262 
269 
276 
282 
288 
207 
309 
313 
331 
338 
360 
