PLATE XV. 



PAGE 



Fig. 1. Voluta (Volutilithes) a byssicola, Adams and Eeeve . . .258 



a. The shell, front view. 



b. The same, back view. 



c. The sculpture, magnified 6 diameters. 



Fig. 2. Guivillea alabastrina, n. sp. . . . . • .262 



a. The shell. j b. The apex, slightly enlarged and turned round. 



Fig. 3. Voluta (Cymbiola) lutea, n. sp. . . . . . .255 



a. The shell. b. The same, slightly turned round so as to show 



the edge of the outer lip and the teeth of 

 the pillar. 



