EXPLANATION OF PLATE XXIV. 



Ancutinella Vikginiana Conrad (p. 132). 



Fig. 1. View of ii small specimen which shows the spines on the exterior snrface. 



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. 



'I'ltli'OKis Tr.RF.iiRATA Heilprin (p. 133). 

 Fig. l>. Knlargemrnt of the type, the only fragment known, greatly enlarged. 



MONILEA (LEIOTROCHD.S) EHOREA Wagucr (p. 13.^). 



Flos. 7, 8, 9. Vii'ws of three specimens, showing some slight variations of foiiu and umbilical features. 

 10. I'udir siufacc of specimen, tig. 9. 

 Figures twice enlarged. 



FissruELLA Griscomi Conrad (p. 136;. 



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



13. Vertical view of a shell having line radii. 



14. 8ide view of a large individual. 



ACT.KON SlIILOllENSIS Whitf. (p. 137). 



Figs. 1.5, 16. Two views of tlie only entire individual observed. 

 17. View showing (he aperture of a smaller specimen. 

 Figures enlarged three times 



UaI.ANUS PROTEUS Couiad (]l. 141). 



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



20. Inner surface of a eariual plate. 



21. Inner face of a rostro-laleral plate. 



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



