PLATE XXX. 



Page. 

 ASTARTE CASTANELLA Whitfield 231 



Fig. 1. View of cast of the right valve, showiug the cren illations of the border. 

 2. Similar view of a left valve. 



ASTARTE PLANIMARGINATA Whitfield 232 



Fig. 3. View of a cast of a left valve. Natural size. 

 4. Enlarged view of a rounder specimen 



Protocardia curta Conrad , 236 



Fig. 5. Cast of a right valve which retains the fine radiating striae. 



6. View of a specimen retaining both valves. 



7. View of the hinge as obtained from the specimen, fig. 6, by gutta-percha. 



Cardita perantiqua Conrad 232 



Fig. 8. A cast of the interior. 



9. The exterior as obtained by gutta-percha from a natural mold. 



10. Enlargement of four of the anterior ribs from the last figure. 



Cardita Brittoni Whitfield 233 



Figs. 11 and 12. Views of a specimen which is somewhat distorted, but shows the fine ribs. 



Crassatella obliquata Whitfield 235 



Fig. 13. Right side view of a very j)erfect cast of this species. 

 14. Anterior profile view of same. 



Caryatis ovalis Whitfield 237 



Fig. 15. View of the cast of a rigiit valve which shows the surface features. 

 16. Similar view of a left valve which retains the features of the exterior. 



Veleda ^quilatera Whitfield 238 



Fig. 17. Enlarged view of a cast of a left valve of this species. 



CORBULA (Ne^^RA) NASUTOIDES Whitfield 239 



Fig. 18. View of the right side of a small rotund specimen. 



19. A similar view of a larger slightly compressed specimen. 



Ne^ra ^quivalvis Whitfield 240 



Fig. 20. Enlarged view of a specimen showing the rostrum nearly entiie. 

 21. A larger specimen, natural size, imperfect behind. 



Parapholas Kneiskerni Whitfield 241 



Fig. 22. Lateral view, natural size. 



23. Cardinal view of the same specimen. 



24. Basal view of the same. 



Teredo emacerata Whitfield 242 



Fig. 25. View of a group of the fillings of tubes showing their general character. 



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