Fossils of the Middle Chalk. 
Fig. 61.—Spondylus spinosus, Soiv. (Nat. size.) 
Fig. 62. —Rkynchonella Cuvieri, d’ Orb. a , front view; b, side view. 
Enlarged. 
Fig. 63.— Cardiaster pygmseus, Forbes, a , apical view; b, posterior view. 
Enlarged. 
Fig. 64— Galerites subrotundus, Mant. a , front view ; b, side view. 
Nat. size. 
Fig. 65. —Hemiaster minimus, Ag. a , side view ; b, apical view. Enlarged 
• byi 
Fig. 66. —Discoidea Dixoni, Forbes, a , side view ; b , basal view. Twice 
nat. size. 
