X COX'J'EN'l'S. 



CHAPTKK XXI. 



< 'Ciienil cliarauters uf the Ce[)!iHli)inKla — Reproductive jiroce.^s in 

 tlie Cuttle-fishes — Sliell (if t!ic Cephalopucla — Dibranchiata 

 — Tetrabranchiata— Orthncerata— Auiulniiitei, . . 208-217 



CHAPTIOU XXJI. 



Ileiicra! uhai-arters ol' tlic Virtiliratii — Skeletnii of Vertebrates — 

 Structure of a verteln-a — A'ertebral column — Limbs of Ver- 

 teltrates — 1 )igestive system — Circulatory system — Respira- 

 tory system — Ner^'ous system — Reproduction — Primary 

 <li\isi'_nis — Ichthyup.sida — Sauropsida — ]\Iammalia, . . 218-227 



CHAPTKU XXIII. 



General characters of the Fishes — Scales — Endoskeleton — Limbs 



— Tail — Digestive .system — Circulation — Respiration — Ner- 

 vous system — Organs of hearing and smell — Reptroduction, . 228-236 



CHAPTKR XXI\', 



(Orders of Fishes — Pharyngobranchii — jNIarsipobranchii — Teleostei 



— Sub-orders of ttie Teleostei — (ianoidei — Klasmobranchii — 

 Sub-orders of the Elasmol.iranchii — iJipnoi, . . . 237-218 



CHAPTICR XXV, 



(Jeneral characters of the .\mphibia — Orders of the Amiihibia — 



I )phiomoi-pha — lo-odela— Anoura — Labyrinthodontia, . 249-256 



CHAPTER XXVI. 



Ccneral characters of llie Reptilia — Circulatory and Respii-atory 



systems — Di\'isions, ... ... 257-260 



CHAI'TKR XXVll. 



Orders .if Reptilia -Chclonia— I Iphidia- Lacertilia— Ci'.icodilia — 



Ichthyo|iterygia— Sauro].terygia — Ptci-osauria — A nodon- 



tia — Deinosauria — Theriodontia. .... 261-277 



CHAPTER XXVIII, 



(General char.acters of tlie class Avcs— Feathers — Vertebral column 

 — Anterior e.\treniity and ]wctoi"d ai-ch — Posterior extremity 

 and pelvic arch — Digcstixi- ,syslcm — Respiration — Circula- 

 tory system — Nervous system —( Irgans of the senses — Migra- 

 tions of Bh-ds, ....... o;8-2SH 



