50 CLASS I. 



***** Cells simple, clustered round an axis, each making half a spire 

 (Agathistegia) . 



Genera : Uniloculina, Biloculina, D'ORB. (Sp. Bilocul. Bulloides 

 D'ORB. 1. 1. Tab. xvi. fig. 1 3), Fabulama DEFRANCE (Sp. Fabul. 

 discolithes D'ORB. 1. 1. Tab. xvn. Fig. 1417), Spiroloculma, Trilo- 

 culina D'ORB. (Sp. Triloc. trigonula D'ORB. 1. 1. Tab. xvi. fig. 5-9), 

 Cruciloculina, Artiloculina, Sphceroidina, Quinqueloculina D'ORB. 

 (Sp. Quinqueloc. saxorum D'ORB. 1. 1. Tab. xvi. fig. 10-14), Adelosina 



D'ORB. 



The last division coincides for the most part with the genus 

 Miliola LAM. DUJARDIN has described and figured a living species 

 of this genus with its capillary processes or extensions under the 

 name of Miliola vulgaris ; Infos. PL i. fig. 14. 



ORDER III. Atricha. 



Animalcules without a distinct mouth, furnished with one or 

 more flagelliform filaments for motion, form persistent or mutable. 



Family IV. Monadina. Body not loricatecl, gelatinous, pellucid. 



Monas MUELL. (exclusive of several species). Body oblong or 

 round, with a single flagelliform filament. 



See figures in EHRENB. In/us. Tab. i. To this genus belong animalcules 

 of iooo nne > m which the highest magnifying power shews no organisation, 

 and which even at the present day, with the assistance of the best 

 microscopes, cannot be otherwise characterised than as punctiform bodies 

 the character given by MUELLER to his genus Monas. 



Uvella BORY, EHRENB. [Monadines associated in clusters in 

 form of a mulberry or of grapes revolving in all directions.] 



Cercomonas DiUARD., Bodo EHRENB. (in part). Body caudate. 



Family V. Cryptomonadina. Body loricated, with a mem- 

 branous flexible test. 



Cryptomonas EHRENB. {Cryptoglena ejusd., with an eye- 

 point). 



Family VI. Volvocina. Several animalcules contained in a com- 

 mon envelope, or famished each with its own envelope, which is 

 confluent into one mass. 



