PLATE XXXVlll. 



Fig, I. J'ciius lialidona Dall, right valve, enlarged to bring out sculpture; Ballast 

 Point, Tampa Bay, Florida, silex beds; Ion. ^y mm. 



Fig. la. The same, umbonal view. 



Fig. 2. J'ciius tarquinia Dall, = f'. magniiica Heilprin non Sowerby, left valve, en- 

 larged slightly; Ion. 49 mm.; Ballast Point silex beds. 



Fig. 2a. The same, iimbonal view. 



Fig. 3. Tcllina (Mcrisca) lialidona Dall; Ballast Point silex beds; Ion. 14.5 mm.; 

 p. 1021. 



F"ig. 3a. The same, inside view; p. 1021. 



Fig. 4. Area iimbonata Lamarck; from above; Ballast Point silex beds; Ion. 36.0 

 mm. ; p. 620. 



Fig". 4a. The same, inside view of left valve ; p. 620, 



Fig. 5. Lcda Acxuosa Heilprin, type specimen ; Ion. 14.25 mm. ; p. 589. 



Fig. 5a. The same, dorsal view. 



Fig. 6. Sciiicle silicata Dall ; Ballast Point silex beds ; Ion. 23.0 mm. ; p. 987. 



Fig. 7. Cyrciia l^oinplwlyx Dall, interior view of right valve; from the Ballast Point 

 silex beds ; Ion. 43 mm. 



Fig. 8. The same, external view. 



Fig. 9. Cardita serricosta Heilprin, interior view of a silicious pseudomorph. natural 

 size ; Ballast Point silex beds. 



I 194 



