XX 



LIST OF ILLUSTRATIONS. 



FIG. 



1 36. Cassis cancdlata, . 



137. Scalana Grcenlandica, . 



138. Fusus tornatus, 



139. Doris Johnstoni, . 



140. Carinaria cymbium, 



141. Limax Sowerbyi, 



142. Cleodora pyramidata, and 



Cuvieria columnella, 



143. Sepiola Atlantica, . 



144. Diagram of a Cuttle-fish, 



145. Octopus car^na, . 



146. Paper Nautilus, 



147. Diagram of Belemnite, . 



148. Pearly Nautilus, 



149. Diagram of the Siphun- 



cle and Septa in the 

 shells of various Tet- 

 rabranchiate Cephalo- 

 pods, 



150. Orthoceras explorator, 



151. Shells of Secondary Ceph- 



alopods, . 



152. Transverse sections of 



the body of an inver- 

 tebrate and a verte- 

 brate animal, 



153. Embryology of Verte- 



brata, 



154. Lumbar Vertebra of 



Whale, and diagram 

 of thoracic vertebra, . 



155. Skeleton of the Beaver, 



156. Pectoral Limb of Chim- 



panzee, 



157. Pelvic Limb of Chimpan- 



zee, . . . . 



158. Diagram of the digestive 



system of a Mammal, 



1 59. Blood-corpuscles of Verte- 



brata, 



1 60. Diagram of the Circula- 



tion of a Mammal, 



161. Scales of Fishes, . 



162. Skeleton of the Common 



Perch, 



163. Skull of the Cod, . 



164. Os hyoides and branchial 



arches of the Perch, . 



1 65 . Pectoral Limbs of Fishes, 



1 66. Outline of Perca granu- 



lata, . . . 



167. Homocercal and hetero- 



cercal Tails, 



1 68. Diagram of the Circula- 



tion of a Fish, . 



