DIVISION IU. 
4. Mrxrora. Lam. 
Oval, globulous, or ob- 
long ; subtrigonal ; the spi- 
ral turning around an axis 
perpendicular to theplanes 
of the turns; divided into 
2 or 3 chambers, the last 
pierced by a lateral hole, 
which is the only aperture. 
Pl. 1, fig. 6. 
2. Pottontes. Monéf. 
Resembling the Miliola, 
but the chambers pierced 
alternately towards both 
ends of the shell, and 
the last open the whole 
breadth. Pl. 3, fig. 16. 
3. Aretuusa. Monif. 
Chambers rolled ob- 
liquely (making the shell 
turreted) and only the 
Jast perforated. Pl. 3, 
fig. 17. 
4, Metonires. Lam. 
No apparent mouth ; 
consisting of numerous 
tubes or siphons united in 
a plane rolled on itself. 
Pl. 2, fig. 1. 
5. Gyroconires. Lam. 
Hollow spheroids, com- 
posed of seyeral linear 
pieces, curved, jomed at 
the sides, the extremities 
terminating in the poles; 
the surface furrowed in 
transversal circles (2). 
Pit, ent. 
( 16 ) 
GENERA. 
With chambers. 
ee a cM A ee oe a 
Without chambers. 
SPHERULACEZ. 
Marine. Some species 
found on Fuci, in the 
neighbourhood of Cor- 
sica (1). 
- 
On the shores of the 
Mediterranean Sea and 
Indian Ocean. 
Microscopic. On the 
shores of the Adriatic. 
Scattered throughout 
the masses of silex be- 
longing to the First and 
Secous Fresh Water 
Formation of the enyi- 
rons of Paris. 
(1) The fossil species have formed, exclusively, immense beds of stone, espe- 
cially in the quarries of the environs of Paris. 
(2) Only one species known, the size of a pin’s head, G, medicaginula, Lam. 
