PLATE XXXIX. 



Fig. I. Cyprcca chilona Dall, from above; Chipola horizon at Alum Bluff, Florida; 

 Ion. 50 mm. 



Fig. 2. Solarium cupola Heilprin, basal view ; Eocene of Wood's Bluff, Alabama ; diam. 

 1 8 mm. ; p. 326. 



Fig. 3. Cyprcca chilona Dall (Fig. i), basal view; Ion. 44 mm.; laterally defective. 



Fig. 4. Helix (Plagioptyeha) direpta Dall, basal view; diam. 15 mm.; p. 10. 



Fig. 5. Helix (Plagioptycha) direpta 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 Wagneriana 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. 



H95 



