( 16 ) 



DIVISION III. SPHERULACE7E. 



3. Miliola. Lam. 



Oval, globulous, or ob- 

 long ; subtrigonal ; the spi- 

 ral turning around an axis 

 perpendicular to the planes 

 of the turns ; divided into 

 2 or 3 chambers, the last 

 pierced by a lateral hole, 

 which is the only aperture. 

 PI. 1, fig. 6. 



2. Pollontes. Montf. 



Resembling the Miliola, 

 but the chambers pierced 

 alternately towards both 

 ends of the shell, and 

 the last open the whole 

 breadth. PI. 3, fig. 16. 



3. Arethusa. Montf. 



Chambers rolled ob- 

 liquely (making the shell 

 turreted) and only the 

 last perforated. PL 3, 

 fig. 17. 



4. Melonites. Lam. 



No apparent mouth ; 

 consisting of numerous 

 tubes or siphons united in 

 a plane rolled on itself. 

 PI. 2, fig. 1. 



5. Gyrogonites. Lam. 



Hollow spheroids, com- 

 posed of several linear 

 pieces, curved, joined at 

 the sides, the extremities 

 terminating in the poles ; 

 the surface furrowed in 

 transversal circles (2) . 

 PI. 1, fig. 14. 



GENERA, 

 With chambers. 



Without chambers. 



Marine. Some species 

 found on Fua\ in the 

 neighbourhood of Cor- 

 sica (1). 



On the shores of the 

 Mediterranean Sea and 

 Indian Ocean. 



Microscopic. On the 

 shores of the Adriatic. 



Scattered throughout 

 the masses of silex be- 

 longing to the First and 

 Second Fresh Water 

 Formation of the envi- 

 rons of Paris. 



(1) The fossil species have formed, exclusively, immense beds of stone, espe- 

 cially in the quarries of the environs of Paris. 



(2) Only one species known, the size of a pin's head, G, medicaginula. Lam, 



