‘- 
Parr IIL Secr. iii. §1.] CRETACEOUS. 809 
from the fortunate discovery of other similar accumulations. Thus 
from the so-called “Cambridge Greensand’’—a bed about 1 foot 
thick lying at the base of the Chalk of Cambridge, and largely 
_ worked for phosphate of lime derived from coprolites and bones, 




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Fig. 395.—CrETACEOUs CEPHALOPODS. 
a, Ancyloceras matheronianus (D’Orb.) (4); 6, Hamites attenuatus (Sow.) (4); 
e, Toxoceras bituberculatus (D’Orb.); d, Scaphites zequalis (Sow.). 
there have been exhumed the remains of several chelonians, the 
great deinosaur Acanthopholis, several species of Plesiosaurus, 5 or 
6 species of Ichthyosawrus, 10 species of Piterodactylus from the size 
of a pigeon upwards—one of them having a spread of wing amount- 
ing to 25 feet—3 species of Mosasaurus, a crocodilian (Polypty- 
