INDEX 



Scotland — ^Fishes — contd. 



Recent discoveries from the 

 Upper Silurian strata, 

 262 

 Sea Cow : 



Bony plates instead of 

 teeth, 23 



Description of, 22, 23 



Discovered by Steller, 21 



Fossils found in the Fayum, 

 125 



Picture of, 22 



Sirenian group, sea-cow be- 

 longing to, 23 



Skull, photograph of, 22 

 Seely, Professor, 211 

 Seychelles — tortoise becoming 



extinct in, 28 

 Sharks : 



Most ancient kind of fish 

 known, 247 



Probable size of the great 

 shark — 100 feet long, 

 266 



Teeth — enormous teeth, 

 where found, etc., 263, 

 264, 265 

 Shells and small marine ani- 

 mals, etc. : 



Animals which lived inside 

 these shells, similarity 

 to the cuttle-fish, 269 



Bognor rock with shells em- 

 bedded, photograph, 

 45 



Coiled shells — ammonites, 

 pearly nautilus, etc., 

 267 



Cuttle-fish — Belemnite's 

 cuttle-fish, etc., 270 



Extinct allies of nautilus, 

 268. 269 



Shells, etc. — contd. 



Lingula, shells of, found in 

 the Cambrian rocks, 

 272, 273 



MoUusca group, classes in- 

 cluded in, 270 



Oldest fossils which are 

 known — remains of 

 small marine creatures, 

 271, 272 



Trilobites see that title. 



Vast number of smaller 

 creatures included in 

 " Extinct Animals " — 

 mountains built up of 

 rock formed by the 

 coral, etc., 266 

 Siberia — mammoth and rhi- 

 noceros remains fo^lnd 

 in, 93, 94 

 Silver-scaled fish — varieties 

 and comparatively re- 

 cent origin, etc., 246 

 Sivatherium — extinct animal 

 from India : 



Skull — photograph, 160 



Teeth of lower jaw — crown 

 divided by slit into two 

 halves, described as bi- 

 foliate, 159 

 Size : 



Bones — giants in former 

 days, theory of, 2 



Mammals, remote ancestor 

 not much bigger than 

 a dog, 114 



Recent animals, size of, 

 compared with their 

 representatives in the 

 past — illusions as to 

 extinct monsters, 165, 

 166 



324 



