CONTENTS xiii 



XXIII. BKANX II CHORDATA: THE ASCIDTANS, VERTE- 

 BRATES, ETC. 



Structure of the vertebrates, 259. Classification of the Chordata, 260. 

 The ascidians, 261. 



XXIV. BRANCH CHORDATA (CONTINUED). 



CLASS PISCES : THE FISHES. 



EXAMPLE: THE GOLDEN SUNFISH EUPOMOTIS GIBBOSUS) [Laboratory 

 exercise]. External structure, 263. Internal structure. 265. Life-history 

 and habits, 270. 



OTHER FISHES. 



Body form and structure, 271. Development and life-history, 276. 

 Classification, 277. The lancelets (Leptocardii), 277. The lampreys and 

 hag-fishes (Cyclostomata), 278. The true fishes (Pisces), 279. The sharks, 

 skates, etc. (Elasmobranchii), 279. The bony fishes (Teleostomi), 281. . 

 Habits and adaptations, 285. Food-fishes and fish -hatcheries, 288. 



XXV. BRANCH CHORDATA (CONTINUED). 



CLASS BATRACHIA : THE BATRACHIANS. 



Body form and organization, 292. Structure, 293. Life -history and 

 habits. 295. Classification, 297. Mud-puppies, salamanders, etc. (Uro- 

 dela), 297. Frogs and toads (Anura), 299. Coecilians (Gymnophiona), 

 302. 



XXVI. BRANCH CHORDATA (CONTINUED). 



CLASS REPTILIA: THE SNAKES, LIZARDS, TURTLES. CROCODILES, ETC. 



EXAMPLE : THE GARTER SNAKE (THAMNOPHIS SP.) [Laboratory exer- 

 cise]. Structure, 303. Life-history and habits, 308. 



OTHER REPTILES. 



Body form and organization, 310. Structure, 311, Life-history and 

 habits, 312. Classification, 313. Tortoises and turtles (Chelonia), 314. 

 Snakes and lizards (Squamata\ 317. Crocodiles and alligators (Croco- 

 dilia), 325. 



XXVII. BRANCH CHORDATA (CONTINUED). 



CLASS AVES : THE BIRDS. 



EXAMPLE : THE ENGLISH SPARROW i PASSER DOMES ncus) [Laboratory 

 exercise]. External structure, 327. Internal structure [Laboratory exer- 

 cise], 329. Life history and habits, 335. 



OTHER BIRDS. 



Body form and structure, 336. Development and life-history, 339. 

 Classification. 340. The ostriches, cassowaries, etc. (Rutitx), 341. The 



