PLATE XL. 



Fig. I. Nucula (Acila) decisa Conrad; Pittsburg, Oregon; outside view; Ion. 24.6 



mm.; p. 573. 

 Fig. 2. Liicina plcsioloplia Dall ; Oligocene of Oak Grove, Florida ; interior of left 

 valve ; alt. 15.5 mm. 

 Nucula {Acila) decisa Conrad, interior; Ion. 24.6 mm.; p. 573. 

 Nucula (Acila) cordata Dall; Miocene of Oregon; Ion. 16.0 mm.; p. 573. 

 5. Lucina plcsiolopha Dall, exterior ; alt. 15.5 mm. 



Nucula Shaleri Dall; Miocene of Gay Head, Martha's Vineyard, Massachusetts; 



Ion. 16.5 mm. ; p. 575. 

 Cardium dntidicuiii Dall; Oak Grove sands; exterior of left valve; Ion. 25 



mm. ; p. 1094. 

 Cardium cliipolanuin Dall; Chipola marl; exterior of right valve; alt. 36 mm.; 



p. 1098. 

 Cardium taphriiim Dall, e.xterior of left valve; Oak Grove sands; Ion. 35 mm.; 

 p. 1098. 

 Fig. 10. Cardium (Fragum) arestum Dall; Caloosahatchie beds; alt. 27 mm.; p. 1102. 

 Fig. II. The same from behind; alt. 27 mm. 

 Fig. 12. Cardium (Trigoniocardia) alicula Dall, a worn pseudomorph from the Ballast 



Point silex beds; alt. 13 mm.; p. 1103. 

 Fig. 12b. Astyris turgidula Dall ; Ballast Point, Tampa Bay, silex beds ; alt. 13 mm. 

 Fig. 13. Cardium ctcnoUuni Dall; Oak Grove sands; alt. 20 mm.; p. 1081. 

 Fig. 14. Cardium pansatrum Dall; Oak Grove sands; Ion. 12.3 mm.; p. 1093. 

 Fig. 15. Cardium (Hemicardium) apatcticmn Dall; Oak Grove sands; outside of left 



valve; alt. 10.5 mm.; p. 1105. 

 Fig. 16. Cardita sp. ; Oak Grove sands; Ion. 20.5 mm.; young shell. 



1 196 



