PLATE XXXIX. 



Cypraa chilona Dall, from above; Chipola horizon at Alum Bluff, Florida; 



Ion. so mm. 

 Solarium cupola Heilprin, basal view ; Eocene of Wood's Bluff, Alabama ; diam. 



i8 mm. ; p. 326. 

 Cyprwa chilona Dall (Fig. i), basal view; Ion. 44 mm.; laterally defective. 

 Helix (Plagioptyclia) dircpta Dall, basal view; diam. 15 mm.; p. 10. 

 Helix {Plagioptyclia) dircpta Dall; Ballast Point silex beds; a perfect speci- 

 men figured to supply the deficiencies of the original figures ; alt. 13 mm. ; 

 p. 10. 

 Fig. 6. Area IVagucriaua Dall; Caloosahatchie beds; a specimen with unusually pro- 

 duced wings ; Ion. 12.7 mm. ; p. 619. 

 Fig. 7. The same, viewed from above. 

 Fig. 8. Solen amphistemma Dall ; Oligocene sands of Oak Grove, Florida ; interior of 



right valve ; Ion. 112 mm.; p. 952. 

 Fig. 9. Crassatellites densus Dall; Oak Grove sands; interior of right valve; Ion. 



59 mm. 

 Fig. 10. The same; another specimen viewed from above. 

 Fig. II. The same; another specimen showing variation in form. 



Fig. 12. The same ; a specimen having what is probably the most normal form of the 

 species. 



II95 



