368 THE MEDALS OF CREATION, Cuap. X. 
identical with that exhibited by the fossil specimens ; and if 
viewed by reflected light, the body may be seen occupying 
all the cells of the shell; but the segments are somewhat 
collapsed ; evidently from the shrinking of the animal tissues 
after death.* 
The organisms of the Lincolnshire alluvium have been 
thoroughly investigated by Prof. Williamson ; they comprise 
many species and genera, of the usual types; as Rotalie, 
Rosalinee, Polystomellee, Textularize, Lagenze, Nodosariz, &c. 
It is remarkable, that though a marine estuary deposit, no 
vestiges of diatomaceze have been observed. 
The bed so rich in foraminifera, extends west and south- 
west of the Wash. Mr. Smith sent me a mass of sandy 
clay, from a well sunk in the town of March, to the depth 
of twenty-five feet, that was loaded with these beautiful 
organisms. 
Recent ForAminirerous Deposit at Bricuton.—An in- 
teresting fact connected with the phenomena under review 
is deserving record. The presence of the fossils of an older 
formation, in strata subsequently deposited, and in part 
composed of the detritus of the rocks whence the organic 
remains were derived, is not uncommon: such fossils are 
termed by the French geologists “fossiles remaniés.” The 
nature of these re-deposited fossils is generally obvious ; 
either by the waterworn condition of shells, bones, &c¢. or 
from their containing particles of their parent bed; or if 
casts, from their mineral composition. Thus im the chalk of 
St. Catherine’s Mount, near Rouen, there are numerous 
casts of Ammonites, Scaphites, and other shells, composed 
* Two specimens are figured in my notice of fossil Foraminifera, 
Phil. Trans, p. iv. for 1846, pl. xxi. figs. 13, 14. 
} The reader interested in these inquiries should peruse the highly 
interesting Memoir by Prof. Williamson, “On some Microscopical 
Objects found in the Mud of the Levant, and other Deposits.” Man- 
chester Phil, Trans. vol. viii, . 
