APPENDIX. 253 



Family 22. Fissipedes. Toes 3 or 4, but in the inter- 

 mediaries approximated; others 4-3 toed. 



* Toes 4-3. ** Toes 4-4 *** Toes 2-2. 

 Family 23. Pachydermata. Feet pentadactyle or tri- 

 dactyle, the other digits being rudimental; digits only per- 

 ceived externally, &c. 



* Pentadactyla, (Proboscida.) ** Tridactyla. 



Sub-class II. Bipeda. 



No hind limbs; (merely indicated by bones.) Fore limbs 

 fins; neck not distinct from the body; body pisciform, ter- 

 minating in a cartilaginous horizontal fin-shaped tail. 



(Live in the water; have no external ears, nor hair on 

 the body. 



ORDER IX. Cete. 



Family 24. Sirenia. Mammae pectoral; no blow-holes. 

 Family 25. Hydraula. Mammae inguinal ; with blow- 

 holes. 



