300 EXTINCT MONSTERS 
in strata of corresponding age in North America and New 
Zealand. A few isolated teeth occur in the cave-deposits of 
Italy. The Natural History Museum contains an _ excellent 
reproduction of the skull of Squalodon. 
The researches of Dr. C. W. Andrews (see his catalogue 
referred to on p. 266) and Dr. E. Fraas in Egypt have revealed 
several earlier ancestors of the whales. Of these Protocetus 
appears to be derived from the Creodonts (early ancestors of the 
Carnivora). This is followed by Prozeuglodon. 
Remains of the gigantic Sperm Whale or Cachalot (Physeter 
macrocephalus) are found in the Forest-bed of Cromer, and also 
Fig. 111.—Skull of thick-toothed Grampus, Psewdorca crassidens. (Owen.) 
Fen, Lincolnshire. 
in a later deposit in South America. A number of Miocene and 
Pliocene forms allied to the Cachalot have been described under 
various names. Remains of the curious Narwhal, with its long 
spear-like tusk, have been found in the Norfolk forest-bed. 
Owen has described the skull of a thick-toothed Grampus 
that was found beneath the turf in the great fen of Lincoln- 
shire, in the year 1843 (see Fig. 111). It belongs to the existing 
Pseudorca crassidens, but Owen thought it differed from the 
present dolphins of our own coasts. Extinct genera of dolphins 
are known to occur in some of the later Tertiary deposits of 
Europe and America, 
