Class VI. ARCA. ARK-SHELL. 217 



nated; teeth of the hinge about ten, quite 

 transverse. 



Found on the coast of Cormvall,a.nd on the 

 shores of Guernsey. 



Lin. Syst. 1143. No. 182. Mont. Test. Br. 136. Q. pilosa. 



Gm. Lin. 3314. A. Glycymeris.. ,Br. Zqol. %. orbicular,. 

 List. Conch, tab. 24,7- Jig- 82. 98. 



Zz'ra. TV. viii. 94. *. 3./. 4. 



A. with thick orbicular shells, marked with 

 concentric stria; white zigzagged with ferrugi- 

 nous ; edges crenulated ; hinge in the middle, 

 and hinge teeth oblique. Diameter about two 

 inches. Tab. lxi. jig. 1, 



Lin. Syst. 1141. No. 184. £ire. TV. viii. 95. 7 # nucleus. 



G?k. Lin. 3314. M>ra^ TW. £r. 141. silvery. 



A. with unequally triangular shells; smooth, 

 pure white without, silvery within; margin 

 finely crenated. Size of a pea. 



Gm. Lin. 3308. Mont. Test. Br. Sup. 55. t. 27. J. 7. 8. ROSTRATA. 



* A. with a somewhat ovate convex shell trans- 

 versely striated; the hind part rounded, the 

 fore part produced into a bent lip. 

 St. Abb's head, Frith of Forth. 



