CONTENTS 



Class 3. The Myriapoda 



Example of the Class — Scolopendra morsitans . 

 Class 4. The Insecta 



Example of the Class — Periplaneta americana 

 Class 5. The Arachnida .... 



Example of the Class — Scorpio 



PAGE 



239 

 239 

 241 

 241 

 254 

 2 54 



SECTION XI 



Phylum Mollusca 



Class 1. The Pelecypoda . 



Example of the Class — Anodonta cygnea 

 Class 2. The Amphineura 



Example of the Class — Chiton spinosus 

 Class 3. The Gastropoda . 



Example of the Class — Helix nemo7-alis 

 Class 4. The Cephalopoda 



Example of the Class — Nautilus pompillus 



264 

 265 

 265 

 281 

 281 

 284 

 284 

 296 

 298 



SECTION XII 



Phylum Chord at a 310 



Subphylum 1. The Adelochorda 311 



Example of the Subphylum — Balanoglossus . . .311 



Subphylum 2. The Urochorda . 314 



Example of the Subphylum — Ascidia . . . .314 



Subphylum 3. The Vertebrata .... . 322 



Examples of the Subphylum — Amphioxus, Peiromyzon, 



Pisces, etc. ........ 322 



Division A. The Acrania . ... 323 



Example of the Division — Amphioxus lanceolatus . 323 



Division B. The Craniata . . . 328 



Examples of the Division, the dogfish, lizard, and rabbit . 328 



Class 1. Cyclostomi . 360 



Example of the Class — Petromyzon marinus . . 360 



Class 2. Pisces . . . . 365 



Examples of the Class — ■ Sharks, perch, and lung fishes . 365 



