LIST OF ILLUSTRATIONS. 



159- 

 1 60. 

 161. 

 162. 

 163. 

 164. 

 165. 

 i65. 

 167. 

 168. 

 169. 

 170. 

 171. 

 172. 



173- 



174. 



175- 

 176. 

 177. 

 178. 

 179. 

 180. 

 181. 

 182. 

 183. 

 184. 

 185. 

 1 86. 

 187. 

 188, 

 189. 

 190. 

 191. 

 192. 



193- 

 194. 

 195. 

 196. 

 197. 



199. 



Spiral valve of skate. (T. J- Parker), 



Upi^er part of the dorsal aorta in the skate. (MONRO), 



Heart and adjacent vessels of skate. (Monro), . 



Urinogenital organs of male skate, 



Urinogenital organs of female skate. (Monro), . 



Elasmobranch development. (Balfour), 



External characters of a Teleostean — a carp. (Leukis), 



Caudal vertebra of haddock. 



Disarticulated skull of cod. 



Pectoral girdle and fin of cod. 



Diagram of Teleostean circulation. (NuHN), 



Young skate. (Beard), .... 



Outline of Acanthodes sulcatus. (Traquair), 



Pterichthys vtilleri. (Traquair), 



Skeleton of Ceratodiis fin. (Gegenbaur), 



Head region of /'ro/o/'^rt-zM. (W.N.Parker), . 



Vertebral column and pelvic girdle of bull frog. 



Skull of frog — upper and lower surface. (W. K. PARKER 



Pectoral girdle of frog. (Ecker), 



Side view of frog's pelvis. (Ecker), 



Brain of frog. (Ecker), . 



Nervous system of frog. (Ecker), 



Arterial system of frog. (Ecker), 



Venous system of frog. (Ecker), . 



Urinogenital system of male frog. (Ecker). 



Urinogenital system of female frog. (Ecker). 



Division of frog's ovum. (Ecker), 



Gastrula stage of newt. (Hertwig), 



Dissection of tadpole. (MiLNKS Marsh.all and Bles). 



Life history of frog. (Brehm), 



Crecilian {lihthyophis^ with eggs. (S.-VRASIN), 



External appearance of tortoise, 



Carapace of tortoise. 



Internal view of skeleton of turtle, 



Dissection of Chelonian heart. (Huxley), 



Heart and associated vessels of tortoise. (NuiiN), 



Hafleria or Sphenodon. (Hayek), 



Side view of skull oi J^accrta. (W. K. P.\RKER). 



Heart and associated vessels of lizard. (NuHN), 



Lung of Chanurleo vulgaris, showing air sacs. (Wieder 



SIIEIM), ...... 



Snake's head. (Nuhn), .... 



