PLATE LIV. 

 Fig. I. Callocardia gatunensis Dall ; Gatun beds, Isthmus of Panama; Ion. 38.O mm.; 



p. 1260. 

 Fig. 2. Chama caloosana Dall, attached valve; Pliocene of Florida; lat. 40.0 mm.; p. 



1402. 

 Fig. 3. Chama Lyelli Dall, cast from Oligocene limestone of Jacksonboro', Georgia, 



showing long spines ; lat., exclusive of spines, 20.0 mm. ; p. 1399. 

 Fig. 4. Dosinia chipolana Dall; Chipola Oligocene; lat. 40.0 mm.; p. 1229. 

 Fig. 5. Chama caloosana Dall, exterior of upper valve; lat. 23.0 mm.; p. 1402. 

 Fig. 6. Chama tampaensis Dall, upper valve ; Oligocene silex beds of Tampa, Florida ; 



lat. 20.0 mm. ; p. 1398. 

 Fig. 7. Pitaria HUH Dall ; Gatun beds. Isthmus of Panama ; Ion. 36.0 mm. ; p. 1268. 

 Fig. 8. Pitaria opisthogrammata Dall ; Pliocene of Florida ; Ion. 32.0 mm. ; p. 1267. 

 Fig. 9. Echinochama antiquata Dall ; Oligocene of the Bowden, Jamaica, marl ; Ion. 



45.0 mm. ; p. 1404. 

 Fig. 10. Pitaria Aoridana Dall ; Chipola Oligocene ; Ion. 30.0 mm. ; p. 1267. 

 Fig. II. Dosinia liogona Dall, adult shell; uppermost Oligocene of Oak Grove, Florida; 



Ion. 48.0 mm. ; p. 1230. 

 Fig. 12. Venericardia wilcoxensis Dall ; Midway Eocene of Matthews Landing, Ala- 

 bama; Ion. 36.0 mm.; p. 1426. 

 Fig. 13. Dosinia acetabulum var. obliqua Dall; Miocene; alt. 49.0 mm.; p. 1231. 

 Fig. 14. Callocardia morrhuana Linsley ; recent for comparison with C. Sayana Conrad ; 



Ion. 49.0 mm. ; p. 1262. 

 Fig. 15. Callocardia gatunensis var. multiiilosa Dall ; Oligocene of the Isthmus of 



Panama; Ion. 38.0 mm.; p. 1261. 

 Fig. 16. Callocardia Sayana Conrad ; Miocene of York River, Virginia ; Ion. 45.0 mm. ; 



p. 1261. 



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