PLEIOCENE FOSSILS. 



PLATE VIII. 



PECTENIDiE. 



Fig. 1. JAKIEA HEMICYCLICA. Upper valve, natural size. Page 25. 



" 2. Lower valve. 



" 3. Side view of fossil. 



" 4. Outline of the ribs. 



" 5. JAISTIKA AFFLNIS. Under side of lower valve, natural size. Page 26. 



" 6. Interior of same, to show the ribs on the margin. 



