102 GENERA OF SHELLS. 



cular ; whorls contiguous, simple, progressive- 

 ly enlarging. Spire eccentric, sublateral, septa 

 imperforate. 



C. squammula, papillosa, laevis, auricularis, faba, scapha, 

 crepidula, aui-icula, tuberosa. 



Orbiculina. Shell subdiscoidal, multilo- 

 cular ; whorls contiguous and compound ; 

 spire eccentric. Chambers short, very numer- 

 ous ; septa imperforate. 



O. numismalis, angulata,uncinata. 



SPHiERULATA. 



Shell globular, spheroidal, or oval; whorls of the spire en- 

 veloping, or the chambers united under one covering. 



MiLLioLiTEs. Shell transverse, oval-glob- 

 ular or elongated, multilocular. Chambers 

 transverse, surrounding the axis, and succes- 

 sively covering one another ; aperture very 

 small, situated at the base of the last whorl, 

 orbicular, or oblong. 



Lamarck states that he possesses specimens in a 

 recent state, which are found on fuci, near the Island 

 of Corsica; but all the species he describes are fossil. 

 The size of these tiny shells scarcely exceeds that of 

 grains of millet, -whence their name ; some are globu- 

 lar, inclining to oval, others oblong, or somewhat 

 triangular. 



Melonites. Shell subspherical, multilocu- 

 lar ; spire central ; whorls contiguous, en- 



