54 EXPLANATION OF THE PLATES. 
CYSTIDEA. 
Fig. 6.—a, 6, c. PSEUDOCRINITES QUADRIFASCIATUS, Pearce. 
From Mem. Geol. Surv., vol. ii., part ii., pl. xiii., figs. 1, 5, 6. 
a. Natural size ; Cystidean ; showing arrangement of stem and body (Forbes). 
6. Ovarian pyramid. 
ce. Largest of the superior rhombs. 
WENLOcK.—Sil., 4th ed., p. 513. Loc.—Dudley. Cat. Brit. Foss., p. 881. 
Fic. 7. ECHINO-ENCRINUS ARMATUS, Forbes. 
From Mem. Geol. Surv., vol. ii., part ii., pl. xviii., fig. 2; column restored 
from Siluria, 4th ed., p. 222, woodcut 55, fig. 6. 
WENLOcK.—Sil., 4th ed, p. 512. Loc.—Dudley ; ibid., p. 222. Walsall, 
Cat. Brit. Foss., p. 78. 
