70 EXTINCT ‘MONSTERS 
to the delight of all geologists. Certain specimens have been 
obtained, from the Lias of England and Germany, that show 
faithful impressions of the skin that covered the paddles. A 
Fic. 11.—Head of Ichthyosawrus platyodon. 
specimen of this nature has been presented to the national 
treasure-house at South Kensington by Mr. Montagu Browne. 
Fia. 12.—Ichthyosaurus tenuirostris, from Wirtemberg. (Fraas.) 
On the inner side of the paddle was a broad fin-like expansion, 
admirably adapted to obtain the full advantage of the stroke of 
the limb in swimming. 
