ROTALIA—ROSALINA. 351 
versely over the dorsal aspect of the spire. One species 
occurs in the chflk formation of Germany ; several in tertiary 
deposits, and in the existing seas. 
The figure, Zign. 113, represents the body of the animal 
deprived of its shell, to illustrate the nature of certain 
fossils from the Chalk, - 
— Rotana. Lign. 114.—The shell, though nautiloid in its 
contour, is regularly turbinated, the cells not globular ; the 
Lien. 114. FORAMINIFERA IN CHALK AND FLINT. 
> a at 
(Seen by transmitted light.) 
Figs. 1, 2, 3, 6.—Different forms of RoTALIA. 
2.—Resembles the recent Rorania st1gMaA; Ehrenberg ; 
from the North Sea, near Cuxhaven. 
4.—Portion of a Nauritus, showing five chambers, partially 
separated, each pierced by the siphunculus: in Flint, from 
Ireland. 
5.—The Bopy oF Aa RorautA, in Flint; the shell is not 
apparent. 
last cell has a central, semilunar, transverse, aperture. There 
are fifty fossil species. The Rotalize appear in the Lias, 
Oolite, and Chalk, in immense numbers, and swarm in the 
_ present seas. 
Rosatina. Lign. 109, fig. 5.—The shell is depressed ; 
_ the spire apparent on one side ; the aperture is a prolonged 
