EXPLANATION OF PLATES. 



PLATE VI. 

 DELPHINID^E. 



1. Monodon monoceros, 75. 



2. Lagenorhynchus albirostris, 99. 



3. Delphinus Delphis, 120. 



PLATE VII. 



DELPHINIDJE. 



1. Steno frontatus, 128. 



2. Platanista Gangetica, 137. 



3. Inia Geoffroyii, 135. 



4. Pontoporia Blainvillii, 134. 



PLATE VIII. 



MANATID^E. 



1. Halicore Dugung, 142. 



2. Rytina gigas, 144. 



The lower jaw is unknown. 



3. Manatus Americanus, 140. 



