9§ SHELLS. Class VI. 



Glycymeris. Lin. Syft. 1 1 43. No* 1 81. Lift. Conch, tab. 247.7%. 82. 

 58. Orbicu- 

 lar. 



A. with thick orbicular {hells, marked with con- 

 centric firia \ white zigzagged with ferruginous; 

 edges crenulated. 



Diameter about two inches. 



Tab. Iviii. fig. 58. 



Nucleus. Lin. Syfi. I14T. No. 184. 



S9- Sil- 



very. 



CED, 



A. with unequally triangular fliells; fmooth, pure 

 white without, filvery within ; margin finely cr*e- 

 nated. 



Size of a pea. 



Tab. Iviii. fig. 59. ■ 



Barlata. Lin. Syft. 1 1 4c. No. 1 70. 



6c. Frin- 



A; with oblong (hells faintly ftriated ; befet with 

 Byjfus fo as to appear bearded. 



In England of the fize cf a horfe-bean, the 

 foreign fpecirr.ens much larger. 



XII. Its 



