138 UNIVALVES. 



that fact. A very small species of the Multilocular 

 Cephalopodes called Miliola (being about the size 

 of a grain of millet) exhibits the power of repro- 

 duction in an equally astonishing degree. In the 

 neighbourhood of Paris these shells are found in 

 the fossil state in such prodigious quantities, that 

 small as they are, they form the principal part 

 of the immense masses of stone which con- 

 stitute several of its quarries. 



NAUTILUS Pompilius* 



LARGE CHAMBERED NAUTILUS. 



Specific Character. Shell with an involuted 

 and concealed spire, smooth ; aperture cordate ; 

 colour whitish, with waved streaks of reddish or 

 yellowish brown, pearly within. 



This beautiful shell is often converted by the 

 inhabitants of the East into a drinking cup ; on 

 the surface they engrave various ornaments and 

 devices. 



NAUTILUS Spirula. 



CROSIER NAUTILUS. 



Specific Character. Shell thin, brittle, trans- 

 parent, with five cylindrical detached whorls divi- 

 ded into numerous compartments, distinguished 

 on the outside by a depressed circular line ; the 

 * Plate VI. figure 4. 



