EXPLANATION OF PLATE XXIV. 
ANGUINELLA VIRGINIANA Conrad (p. 132). 
Fic. 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. 
TRIFORIS TEREBRATA Heilprin (p. 133). 
Fic. 6. Enlargement of the type, the only fragment known, greatly enlarged. 
MonILEA (LEIOTROCHUS) EBOREA Wagner (p. 135). 
Fics. 7, 8,9. Views of three specimens, showing some slight variations of form and umbilical features. 
10. Under surface of specimen, fig. 9. 
Figures twice enlarged. 
FISsSURELLA GRISCOMI Conrad (p. 136). 
Figs. 11,12. Two views of «specimen of medium size. 
13. Vertical view of a shell having fine radii. 
14. Side view of a large individual. 
ACTH ON SuiLonENnsis Whitf. (p. 187). 
Fias. 15,16. Two views of the only entire individual observed. 
17. View showing the aperture of a smaller specimen. 
Figures enlarged three times 
BALANUS PROTEUS Conrad (p. 141). 
Fics. 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. AJl natural size. 
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