INFUSORIA. 49 



** Cells simple, arranged in a spiral 



(Helicostegia) . 



Genera : Cristellaria LAM., Flabellina, Robulina D'ORB. (Sp. 

 Rolulina orbicularis D'ORB. 1. 1. Tab. xv. fig. 8, 9), Fusulina FIS- 

 CHER, Nonionina, Nummulina D'ORB. (Nummulites and Lenticulites 

 LAM. *), Assilina, Siderolina, Hauerina, Operculina (Sp. OpercuL 

 complanata D'ORB. 1. 1. Tab. xiv. fig. 7-10), Vertebralina D'ORB., 

 Polystomella LAM. [Sp. Polyst. strigillata D'ORB. SCHULTZE op. cit. 

 Tab. iv. fig. 1], Feneroplis LAM., Dendritina D'ORB. (Sp. Dendr. 

 arbuscula D'ORB. 1. 1. Tab. xv. fig. 6, 7), Spirolina LAM., Cydolina 

 D'ORB., Lituola LAM., Orbiculina LAM. (Sp. Orbic. numismalis 

 D'ORB. 1. 1. Tab. xvn. fig. 8-10), Alveolina D'ORB. (Sp. Alveol 

 Quoii D'ORB. 1. 1. Tab. xvn. fig. 11-13), Rotalina [Sp. Rotal. veneta, 

 R. Freyeri SCHULTZE op. cit. Tab. in. fig. 17], Globigerina, Planor- 

 bulina, Truncatulina, Anomalina D'ORB. (Sp. Anom. punctulata 

 D'ORB. 1. 1. PL xv. fig. 1), Rosalina D'ORB. (Sp. Rosal. globularis 

 D'ORB. 1. 1. PL xin. fig. 1-4), Valvulina, Verneulina, Bulimina, 

 Uvigerina D'ORB. (Sp. Uvig. pygmcea D'ORB. L 1. Tab. xn. fig. 8, 

 9), Pyrulina, Faujasina, Candeina, Chrysalidina, Clavulina D'ORB. 

 (Sp. Clavul. angularis D'ORB. 1. 1. PL xn. fig. 7), Gaydryna D'ORB. 



*** Cells alternating disposed on two axes, and arranged in a spire 



(Entomostegia) . 



Genera : Kobertina, Asterigerina, Amphistegina, Heterostegina, 

 Cassidulina D'ORB. (Sp. Cassidul Icevigata D'OBB. 1. 1. Tab. xv. 

 fig. 4. 5). 



**** Cells alternating, disposed in two or three roivs, not forming a spire 

 (Enallostegia) . 



Genera : Dimorphina, Guttulina, Polymorphina, Virgulina, Bige- 

 nerina D'ORB. (Sp. Bigen. nodosaria D'ORB. 1. 1. Tab. XL fig. 9 12), 

 Gemmulina D'ORB., Textularia DEFRANCE (Sp. Textul. aciculata 

 D'ORB. 1. 1. Tab. XL fig. 14), Vulvulina D'ORB. (Sp. Vulvul. capre- 

 olus D'ORB. 1. 1. Tab. XL fig. 5 8), Bolivina, Sagria, Cuneolina, 

 D'ORB. 



1 Phacites, Lenticvlites 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 BLU- 

 MENBACH, Albildungen naturhist. Gegenstdnde. No. 40. According to DESHAYES there 

 is found in most of the stone of which Paris is built as much oiMiliola (vid. p. 46) as of 

 sand-grains and it may be said, without exaggeration, that Paris is built of Miliolo 1 . 

 EHRENBERG, Abhandl. der AJcad. zu Berlin, 1838, p. 65. 



VOL. I. 4 



