350 THE MEDALS OF CREATION. Cuap. X. 
becoming produced by age; but the internal structure is 
different ; the cells are simple cavities. 
The chalk and flints of Sussex abound in these crosier-like 
shells, whose existence in the cretaceous rocks was first made 
known by my deeply lamented friend, the late Marquis of © 
Northampton. The annexed lignograph, from drawings ~ 
by his lordship, shows the form and structure as displayed by — 
sections in fractured flints. Four species were named by ~ 
Lord Northampton (see Wond. p. 325); but it is doubtful — 
whether all the specimens belong to more than one species ; 
the apparent diversity of structure may arise simply from — 
the different planes in which the sections happen to have 
been made. 
GLoBIGERINA. Lign. 109, fig. 1.—The shell is furbinateds 
the cells are spheroidal, and the last, or terminal one, has a 
semilunar aperture at the umbilical angle. Several fossil 
species abound in the Chalk and in fie: tertiary — 3a 
and many living species swarm in our seas. 
cee a, er oe. 
Lien. 113. NoNIONINA GERMANICA, x 290. 
A recent specimen of the body of the animal; the shell removed by acids. 
From the North Sea, Cuxhaven. (M. Ehrenberg.) 
Ct tat Ney i iene 
a, a.—Navicule and other organisms in the segments of the animal. 
Nontonina.—Lign. 113.—A nautiloid shell, with simple — 
cells ; the last cell has a single narrow aperture placed trans- 
