SPIROLINA. 349 
are filled with a porous testaceous tissue, as shown in jigs. 
36, 3c: which also illustrate the foraminiferous character 
of the shells in this class of animals; for both the external 
testaceous covering, and the septa of the cells, exhibit per- 
forations.* 
ren. 112. SPIROLINITES IN FLINT. 
Chalk. Sussex. 
(By the late Marquis of Northampton.) 
The specimens are only sections of the shells imbedded in flint, 
and seen as opaque objects with a lens of moderate power. 
The small figures denote the size of the originals. 
Sprrouina. Lign. 112.—The general form resembles that 
of Lituola: the young shell being a discoidal, involute, and 
* The perforations are omitted, by mistake, in the figure of the 
adult shell, fig. 3a. 
