PLATE LVIIl. 



Fig. I. Oliva liodes Dall ; Chipola Oligocene; alt. 27.0 mm.; p. 1576. 



Fig. 2. Colwnhella cosmia Dall; Pliocene marl of Shell Creek, Florida; alt. 13. S mm.; 

 p. 1607. 



Fig. 3. Olivella eutacta Dall ; Chipola Oligocene ; alt. 15.0 mm. ; p. 1576. 



Fig. 4. Oliva (Omogymna) Martensii DslW; Chipola Oligocene; alt. 19.5 mm.; p. 1576. 



Fig. 5. Rhynchonella salpinx Dall, hsemal view; Eocene of Wilmington, North Caro- 

 lina; Ion. 8.2 mm.; p. 1535. 



Fig. 6. The same, viewed from in front. 



Fig. 7. The same, viewed from the side; a, the line of junction of the deltidial plate 

 with the valve. 



Fig. 8. Argyrotheca Schucherti Dall; Miocene of Jackson Bluff, Florida; lat. 5.8 mm.; 

 P- 1539- 



Fig. g. Ringicula chipolana Dall, Proc. U. S. Nat. Mus., xviii., 1895, p. 25 ; Chipola 

 Oligocene of Florida. 



Fig. 10. Rhynchonella Holmesii Dall, anterior view ; Eocene of Wilmington, North 

 Carolina; p. 1536. 



Fig. II. The same, heeraal valve of adult; lat. lo.o mm. 



Fig. 12. The same, young, the beak slightly defective ; alt. 7.0 mm. 



Fig. 13. Discinisca lugubris Conrad, basal valve; seen from above, the posterior portion 

 partly defective; Miocene of Virginia; lat. 13.5 mm.; p. 1534. 



Figs. 14—20, Terebratula wilmingtonensis Lyell and Sowerby; 14, young shell, smooth, 

 alt. 27.0 mm. ; 15, next stage, showing inception of crenulations, alt. 29.0 

 mm.; 16, basal view of 17; 17, full-grown specimen with strong crenations, 

 alt. 36.0 mm. ; from the ventral valve of a specimen of this sort Ravenel 

 probably described his T. canipes; 18, adult specimen with hardly any crena- 

 tion, alt. 35.0 mm. ; ig, very narrow specimen, alt. 36.0 mm. ; 20, large adult 

 of unusual breadth and only faint indications of a tendency to crenulate, 

 alt. 40.0 mm. ; all from Eocene limestone of Wilmington, North Carolina ; 

 P- IS37- 



1631 



