48 CLASS I. 
A. Body simple (Monostegia D’OrB.) 
* Lorica membranous or horny. 
Arcella Enrens. Lorica scutellate, globose, or hemispherical, 
sometimes angulate, open beneath: the animal emitting processes 
variable, plane, obtuse, through the aperture. 
These animals live in fresh water. See Figures in EHRENBERG’S Jn- 
fusionsthierchen, Tab. 1x. fig. v—vur; Dusarp, Jnfus. Pl. 11. fig. 3—5. 
Diffugia Lecuerc. Lorica globose or oval (sometimes sub- 
spiral ?), emitting from the terminal aperture processes of the animal, 
variable, multifidous. 
LEcLERC first discovered these forms (1815) ; see Note sur la Difflugie, 
Mém. du Muséum, II. p. 474—478, Pl. 17. sp. Dil. proteiformis, fig. 2. 3 ; 
Enrens. Infusionsth. Tab. 1x. fig. 1. The shell, according to LECLERC, 
is spiral, what later observers did not perceive ; it is covered with minute 
grains of sand.—Dzifl. globulosa Dusarpin, Ann. des Sc. nat., 2e Série. 
Tom. VII. 1837. Zoologie, p. 310, 312. Pl. 1x. fig. 1. 
Gromia Dusarp. Lorica globose, membranous, emitting pro- 
cesses of the animal variable, slender, of great length, from a round 
aperture. 
Sp. Gromia oviformis Dusarv. Ann. des Sc. nat. 2e Serie, Tom. TV. Zoologie, 
Pl. 1x. fig. 1. 2, in salt water, amongst marine plants ;—Gromia fluvia- 
tilis DusarD. ibid. Tom. VIII. Zoologie Pl. 9. fig. 2 ;—Grom. oviformis 
Dus. ScHuLrze, op. cit. Tab. 1. fig. r. 
** Test calcareous. 
Genera : Orbulina, Oolina and Amphorina, D’Ors.! 
B. Body composed of several segments. Test calcareous, divided 
by septa into cells. 
* Cells simple, arranged on an axis, straight, or slightly curved. 
(Stichostegia). 
Genera: Wodosaria Lam. (Sp. Nodosaria lamellosa D’Ors.) Ann. 
des Sc. nat. 1826, Tom. vu. Tab. x. fig. 4—6.—Glandulina D’Ors. 
(Sp. Glandul. levigata ib. fig. 1-3), Orthocerina, Dentalina D’Ors., 
Frondicularia Drrr., Lingulina, Rimulina, Vaginulina, Marginu- 
lina, Conulina, Pavonina, Webbina D’ Ors. 
1 Since these small bodies are separated by D’Orsreny according to characters 
especially derived from the shell, we have thought it sufficient, for the sake of brevity, 
to indicate the names of the genera. 
