INFUSORIA. 49 
** Cells simple, arranged in a spiral 
(Helicostegia). 
Genera: Cristellaria Lam., Flabellina, Robulina D’Ors. (Sp. 
Robulina orbicularis D’Orp. 1. 1. Tab. xv. fig. 8, 9), Fusulina Fis- 
cHER, Vonionina, Nummulina D’ Ors. (Nummulites and Lenticulites 
Lam.'), Assilina, Siderolina, Hauerina, Operculina (Sp. Opercul. 
complanata D’Ors. 1.1. Tab. xiv. fig. 7-10), Vertebralina D’Ors., 
Polystomella Lam. [Sp. Polyst. strigillata D’OrB. ScHULTZE op. cit. 
Tab. iv. fig. 1], Peneroplis Lam., Dendritina D’Ors. (Sp. Dendr. 
arbuscula D’Ors. 1. 1. Tab. xv. fig. 6, 7), Spirolina Lam., Cyclolina 
D’Orz., Lituola Lam., Orbiculina Lam. (Sp. Orbic. numismalis 
D’Ors. 1. |. Tab. xvu. fig. 8-10), Alveolina D’Orz. (Sp. Alveol. 
Quow D’Ors. |. 1. Tab. xv. fig. 11-13), Rotalina [Sp. Rotal. veneta, 
R. Freyert ScHULTZE op. cit. Tab. 111. fig. 1-7], Globigerina, Planor- 
bulina, Truncatulina, Anomalina D’Orz. (Sp. Anom. punctulata 
D’Ors. |. 1. Pl. xv. fig. 1), Rosalina D’Orz. (Sp. Rosal. globularis 
D’Ors. 1.1. Pl. xu fig. 1-4), Valvulina, Verneulina, Bulimina, 
Uvigerina D’Ors. (Sp. Uvig. pygmea D’Ors. 1. 1. Tab. x1. fig. 8, 
9), Pyrulina, Faujasina, Candeina, Chrysalidina, Clavulina D’Ors. 
(Sp. Clavul. angularis D’Ors. 1. 1. Pl. xu. fig. 7), Gaydryna D’ Ors. 
*** Cells alternating disposed on two axes, and arranged in a spire 
(Entomostegia). 
Genera: Robertina, Asterigerina, Amphistegina, Heterostegina, 
Cassidulina D’Ors. (Sp. Cassidul. levigata D’Orp. 1. 1. Tab. xv. 
fig. 4. 5). 
**** Cells alternating, disposed in two or three rows, not forming a spire 
(Enallostegia). 
Genera: Dimorphina, Guttulina, Polymorphina, Virgulina, Bige- 
nerina D’Ors. (Sp. Bigen. nodosaria D’Orp. 1. 1. Tab. x1. fig. 9—12), 
Gemmulina D’Orx., Teatularia DEFRANCE (Sp. Teaxtul. aciculata 
D’Orz. 1.1. Tab. x1. fig. 1—4), Vulvulina D’Ors. (Sp. Vulvul. capre- 
olus D’Ors. 1.1. Tab. x1. fig. 5—8), Bolivina, Sagria, Cuneolina, 
D’Orz. 
-1 Phacites, Lenticulites or Lentil-stones. These petrifactions are found in some 
localities in such great abundance as to form extensive deposits affording good 
building-stones. In Egypt many monuments are constructed of them. Confer Buv- 
MENBACH, Abbildungen naturhist. Gegenstdnde. No. 40. According to DESHAYES there 
is found in most of the stone of which Paris is built as much of Miliola (vid. p. 46) as of 
sand-grains—and it may be said, without exaggeration, that Paris is built of Miliole. 
EHRENBERG, Abhandl. der Akad. zu Berlin, 1838, p. 65. 
WOlue Le 4 
