PLATE XCVI. 



PAGE 



Figs, la, lb. Mytilus conkadinus d'Orbigny 362 



la. Exterior of right valve. Plum Point. X %. 

 lb. Interior of same valve. 



Figs. 2-4. Mytilus (Mytiloconcha) incukvtjs Conrad 363 



2. Exterior of right valve with part of beak of left valve showing 



beneath. Greensboro, x % 



3. Interior of right beak. Same locality. 



4. Interior of left beak. Same locality. 



