44] 
noderms, and the small number of Mollusks, Mr. Lyell states that 
this deposit presents a perfect analogy to the white or coralline crag 
ef Suffolk; but that its fauna is as distinct, with respect to species, 
from the fauna of the coralline crag, as the other localities of the 
Faluns of the Loire generally. 
Savigné.—Between Doué and Savigné the country consists partly 
of the Eocene freshwater formation, which extends thence almost 
continuously to Paris, and partly of Craie tufeau. Near Savigné the 
Falun is composed of limestone, containing most of the Doué fossils. © 
The result of Mr. Lyell’s labours in this neighbourhood gave the 
following amount of organic remains, obtained chiefly from a pit 
which he had made near the point where the road from Savigné to 
Channay divides from that leading to Courcelles.. The total number 
of species of corals which have been determined amounts to eighteen, 
of Echinodermata to two, of Testacea to seventy-six, and of fishes to 
four. Mr. Lyell also obtained an upper molar of a deer, and a molar 
of the Cherepotamus Cuviert. Of the shells, only ten species were 
not found by the author at other Falun localities near the Loire; and 
twenty-three species, or about thirty per cent., have been identified 
with recent shells. Among the fishes is Lamna contortidens, a spe- 
cies which occurs in the Suffolk crag. The tooth ascertained by 
Mr. Owen to belong to the C. Cuvieri, affords, Mr. Lyell states, an- 
other instance of a mammifer common to Evcene and Miocene pe- 
riods. 
District south of Tours.—The immediate neighbourhood of Tours 
consists of cretaceous valleys, with intervening platforms of Eocene 
freshwater strata. ‘Che Faluns occur from twelve to sixteen miles 
to the south, at Louans, Manthilan and Bossée. At Louans the de- 
posit is exposed in pits from four to five yards deep, and consists of 
white and yellow marl, formed, to a great extent, of comminuted 
shells and corals. From this bed Mr. Lyell obtained 180 species of 
shells, many very small, and generally overlooked by collectors ; the 
corals hitherto determined amount to only six species. Of the Tes- 
tacea he procured all the species, except thirty-three, at other loca- 
lities ; and the recent species have been ascertained to be about forty- 
nine, or in the proportion of twenty-six per cent. At Bossée he 
ebtained» 129 species of Testacea, forty of which, or thirty-two per 
cent., have been identified with living shells; and of the entire num- 
ber Mr. Lyell found all except thirteen in some of the other Faluns. 
Six species of corals,and remains of Lamna and Myliobates, have been 
also ascertained to occur at Bossée; and a posterior molar tooth 
which Mr. Lyell procured there, Mr. Owen has proved to belong to 
the Dichobunes, a genus of Pachyderms, found likewise in the Eocene 
strata of France and the Isle of Wight. 
Pontlevoy.—At this town, thirty miles south-east of Tours, a patch 
of white Falun marl rests on the Eocene freshwater formation. In 
the pits east of the town Mr. Lyell procured perfectly preserved 
shells; and fragments of the Eocene freshwater limestone are found 
in the Falun bored by Petricolz, and full of their shells. The. marl 
is usually covered by three feet of red clay, sand and mould: Mr. 
