EXPLANATION OF PLATES. 



PLATE, 24. PAGE 



MEGISTOCRINUS CORNIGER, N. Sp. (Rowley.) 71 



FIGS. 1,2, 3-4. — Dorsa], ventral and side views of 

 the type. (Fig. 4 is turned in such a way 

 as to show the six spines.) 



MEGISTOCRINUS EXPANSUS, Var. INFLATUS, 



N. Var. (Rowley.) 72 



FIGS. 5, 6—7. — Dorsal, ventral and side views of the type. 



MEGISTOCRINUS CIRCULUS, N. Sp. (Rowley.) 72 



FIGS. 8, 9-10. — Dorsal, ventral and side views of the type. 



MEGISTOCRINUS UNICORNIS, N. Sp. (Rowley.) 73 



FIGS. 11-12. — Dorsal and ventral views of the type. 

 FIG. 13. — Sid view of the same inverted. 



MEGISTOCRINUS EXPANSUS, Miller and Gurley. Rowley. 74 



FIGS . 14, 15-16. — Dorsal, ventral and side view of a 

 small individual. 



