PLEIOCENE FOSSILS. 



PLATE XXI. 



YENERIDJ1. 



Pig. 1. VENUS METASTRIATA. Natural size. Page 79. 



" 2. Outline of another variety, natural size, with a magnified figure. 



" 3. VENUS SUBNASUTA. Outline natural size, with magnified figure. Page I 



" 4. VENUS EEPOSTA. Natural size. Page 80. 



" 5. PETRICOLA PHOLADIFORMIS. Natural size. Page 87. 



" 6. VENUS MERCENARIA. Natural size. Page 81. 



" 1. VENUS CONGENTRICA. Natural size. Page 82. 



" 8. VENUS RYLEYII. Natural size. Page 78. 



" 9. VENUS SAYANA. Natural size. Page 83. 



" 10. VENUS CRIBRARIA. Natural size. Page 83. 



"11. VENUS CANOELLATA. Natural size, Page 84. 



" 12. VENUS LATIL1RATA. Natural size. Page 85. 



