PLEIOCENE FOSSILS. 



PLATE XIV. 



MYTILIDJl-ARCACIDj;. 



Fig. 1. MYTILUS IFCEASSATUS. Exterior of shell natural size. Page 32. 

 " 2. Interior of the same. 

 " 3. MYTILUS IEFLATUS. Interior of shell, natural size, imheclded in marl. Page 33. 



arcacidj:. 



" 4. AECA HIANS. Exterior of upper valve and hinge, and teeth of lower valve, natural 



size. Page 34. 

 " 5. Pallial margin to show gaping. 



" 6. AECA HSTCILE. Exterior of upper and interior of lower valve natural size. Page 35. 

 " 7. End view of same to show hinge. 



" 8. AECA C^ELATA. Exterior of shell, natural size. Page 36. 

 " 9. Interior of shell. 



" 10. Magnified view of the striae, showing nodulous ribs. 

 " 11. AECA CEISTTENAEIA. Exterior of upper and interior of lower valve, natural size. 



Page 37. 

 " 12. .Side view of fossil. 



