EXPLANATION OF PLATE XXIV. 



Axguixella Virginiana Conrad (p. 132). 



Fig. 1. View of a small specimen which shows the spines on the exterior surface. 



2, 3. Two views of a specimen spirally coiled. 



4. View of a specimen cut to show the septa, three of which are seen. 



5. A minute specimen, showing the spiral nucleus, greatly enlarged. 



Trifokis terebrata Heilprin (p. 133). 



Fig. 6. Enlargement of the type, the only fragment known; greatly enlarged. 



Monilea (Leiotrochus) eborea Wagner (p. 135). 



Figs. 7, 8, 9. Views of three specimens, showiug some slight variations, of form and umbilical features. 

 10. Under surface of specimen, tig. 9. 

 Figures twice enlarged. 



Fissurella Griscomi Conrad (p. 136). 



Figs. 11, 12. Two viewj of a specimen of medium size. 



13. Vertical view of a shell having fine radii. 



14. Side view of a large individual. 



Actteox Shilohexsis Whitf. (p. 137). 



Figs. 15, 16. Two views of the only entire individual observed. 

 17. View showing the aperture of a smaller specimen. 

 Figures enlarged three times 



Balaxus proteus Conrad (p. 141). 



Figs. 18, 19. Opposite sides of a rostral plate. 



20. Inner surface of a carinal plate. 



21. Inner face of a rostro-lateral plate. 



22, 23. The opposite sides of a carino-lateral plate. All natural size. 



192 



