xl EXPLANATION OF PLATES. 
PLATE VI. 
DELPHINID. 
1. Monodon monoceros, 75. 
2. Lagenorhynchus albirostris, 99. 
3. Delphinus Delphis, 120. 
PLATE VII. 
DELPHINIDZ. 
. Steno frontatus, 128. 
. Platanista Gangetica, 137. 
- Inia Geoffroyii, 135. 
- Pontoporia Blainvillii, 134. 
m OO DS 
PLATE VIII. 
MANATID&. 
1. Halicore Dugung, 142. 
2. Rytina gigas, 144. 
The lower jaw is unknown. 
3. Manatus Americanus, 140. 
