PLATE XCVI. 
FASE 
Figs, la, lb. Mytilus conradinus d'Orbigny 362 
la. Exterior of right valve. Plum Point. X Vz- 
lb. Interior of same valve. 
Figs. 2-4. Mytilus (Mytiloconcha) incubvcs 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. 
S8 
