204 



222 

 231 



237 



262 

 269 

 276 

 282 



288 

 297 



CHAPTER XX. 

 CHORDA TA ( contin iied) . 



Myxine, as a Type of Cyclostomata 



Raia, as a Type of Pisces 

 Gadus 



309 

 3^3 

 331 



CHAPTER XXI. 

 CHORDA TA {continued). 

 Rana, as a Type of Amphibia 



338 



CHAPTER XXII. 

 CHORDA TA [continued). 

 Columba, as a Type of Aves 



.^60 



